Topic: Yoshi style pipe

[longshanks]

Has anyone ever bought/used this exhaust? or know anyone who has? They look like the 4-1's that I bet Carpy sources from. Would it fit a 76k 750?

http://www.autoparts-ksy.co.jp/products/detail344.html

[bikerboy9999]

Sure looks like it to me, hard to read their discription to be sure though. What does that price convert to in our currency?

[nccb]

about 360 i think

[gecko672]

wow the dollar sure took a hit this year..I was in the middle of doing the conversion online as well and found a post from 2010 when someone asked how much was 28,000 yen in dollars the answer was $238... $238 sure sounds more appealing than $360...
Now if I could only find that time machine..I left it here somewhere.....

[longshanks]

wow the dollar sure took a hit this year..I was in the middle of doing the conversion online as well and found a post from 2010 when someone asked how much was 28,000 yen in dollars the answer was $238... $238 sure sounds more appealing than $360...
Now if I could only find that time machine..I left it here somewhere.....

sucks...check out the graph

http://forecasts.org/yen.htm

[singedebile]

...all those pipes and not one for the 500/550 sheesh

[Retro Rocket]

Has anyone ever bought/used this exhaust? or know anyone who has? They look like the 4-1's that I bet Carpy sources from. Would it fit a 76k 750?

http://www.autoparts-ksy.co.jp/products/detail344.html

Different from Carpy's pipes guys..., More like the one Yamiya sells but with different shaped headers....

[Retro Rocket]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

[srbakker]

But will that fit a 750?

[Retro Rocket]

But will that fit a 750?

No, I should have quoted, I was responding to this guy.....

 

...all those pipes and not one for the 500/550 sheesh

[srbakker]

Oops, ha.  I will have to continue scouring fleabay.

[longshanks]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

that pipe isn't even mandrel bent. were all Yoshi pipes like that?

[MFHP]

Has anyone ever bought/used this exhaust? or know anyone who has? They look like the 4-1's that I bet Carpy sources from. Would it fit a 76k 750?

http://www.autoparts-ksy.co.jp/products/detail344.html

The picture from the link shows pipes for a Honda RC42  which came to market in 1992 as CB Sevenfifty. Won' t fit our 750. Could fit a Nighthawk from the early eighties.

[Retro Rocket]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

that pipe isn't even mandrel bent. were all Yoshi pipes like that?

I have seen 3 different types of pipes from Yoshi for our bikes, Terry has one , i have the other style and member 736 had the original hand bent ones.

srbakker, which pipe are you looking for, Carpy, and Lossa engineering sell Yoshi replica pipes for the 750....

[srbakker]

Yeah I know.  I already bought Carpy's knockoff Dresda swingarm though... I thought I might try to hold out for the real deal on the pipes.

[longshanks]

Has anyone ever bought/used this exhaust? or know anyone who has? They look like the 4-1's that I bet Carpy sources from. Would it fit a 76k 750?

http://www.autoparts-ksy.co.jp/products/detail344.html

The picture from the link shows pipes for a Honda RC42  which came to market in 1992 as CB Sevenfifty. Won' t fit our 750. Could fit a Nighthawk from the early eighties.

you're right. here is the correct one for the K series. feel free to correct me if i'm wrong.

http://www.autoparts-ksy.co.jp/products/detail334.html

[longshanks]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

that pipe isn't even mandrel bent. were all Yoshi pipes like that?

I have seen 3 different types of pipes from Yoshi for our bikes, Terry has one , i have the other style and member 736 had the original hand bent ones.

srbakker, which pipe are you looking for, Carpy, and Lossa engineering sell Yoshi replica pipes for the 750....

speaking of pipe types,      between Carpy, Lossa, and the Yamiya style ones on the link I posted, what gives the best performance? are they all pretty close?

[Greggo]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

That one's on my watch list

[Retro Rocket]

Here's an original for sale....

http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=190615867996&ssPageName=ADME:B:SS:US:1123

that pipe isn't even mandrel bent. were all Yoshi pipes like that?

I have seen 3 different types of pipes from Yoshi for our bikes, Terry has one , i have the other style and member 736 had the original hand bent ones.

srbakker, which pipe are you looking for, Carpy, and Lossa engineering sell Yoshi replica pipes for the 750....

speaking of pipe types,      between Carpy, Lossa, and the Yamiya style ones on the link I posted, what gives the best performance? are they all pretty close?

I think its a game of inches on the street. Personally, i am not a big fan of the way Yamiya made their pipe, beautiful sweeping headers with a cut and shut tail section, why go to the bother of getting the headers correct and fudging on the rest..?  Most performance gains to be had are in the engine and carbs, pipes come in last, so i suppose the answer is, don't worry about the tiny performance benefits between those pipes and just pick the one you like....

[RoyCB550]

According to my mechanic, Taka (the famous honda whisperer) you want the ones with the sharp bends.  it was made like that on purpose to create back pressure per sharp bend.  which is why the baffle on the originals didn't need to be as restrictive.  but at the same time its more restrictive than the ones lossa and carpy claims to be a removable baffle.  i bought one for my 550f from carpy's and he said i lose top end because the smoothness of the bends and the fake baffle lets out all the pressure prematurely.  that being said, he claims that the yoshi pipes in that style was made for the 450 where there are actual numbers available.  he meant r&d.  he doesn't know how it will work for the 550 or 750 in terms of actual performance improvement.  but since we all know we still want these pipes, he said that he can heat up and bend the headers to fit the 550 and probably works for the 750 also.  the original he showed me still provides easy access to the oil filter.  the lossa and carpy versions block the oil filter. 

[Retro Rocket]

According to my mechanic, Taka (the famous honda whisperer) you want the ones with the sharp bends.  it was made like that on purpose to create back pressure per sharp bend.  which is why the baffle on the originals didn't need to be as restrictive.  but at the same time its more restrictive than the ones lossa and carpy claims to be a removable baffle.  i bought one for my 550f from carpy's and he said i lose top end because the smoothness of the bends and the fake baffle lets out all the pressure prematurely.  that being said, he claims that the yoshi pipes in that style was made for the 450 where there are actual numbers available.  he meant r&d.  he doesn't know how it will work for the 550 or 750 in terms of actual performance improvement.  but since we all know we still want these pipes, he said that he can heat up and bend the headers to fit the 550 and probably works for the 750 also.  the original he showed me still provides easy access to the oil filter.  the lossa and carpy versions block the oil filter.

Roy, have you {or your mechanic} ever seen a real Yoshi race pipe.? Smooth as a baby's bum, those cut bends are done because its cheaper and is a recent thing, they  never had sharp bends in the 70's at all, your mechanic really has no idea. The smooth style with the swooping headers is the real Yoshimura pipe and seeing's though they were raced quite successfully on hundreds of bikes, and at ridiculously high revs, that "story" holds no weight at all. Actually, look at nearly all 4 into 1 pipes, show me how many have abrupt, sharp bends in the tail pipe section..?   Yep, none.....  If your mechanic did know what he was talking about he would tell you that, depending on the track and the speeds needed, Yoshimura altered the length of his pipes to tune them for certain tracks, he NEVER put sharp bends in the pipe at all.

[longshanks]

According to my mechanic, Taka (the famous honda whisperer) you want the ones with the sharp bends.  it was made like that on purpose to create back pressure per sharp bend.  which is why the baffle on the originals didn't need to be as restrictive.  but at the same time its more restrictive than the ones lossa and carpy claims to be a removable baffle.  i bought one for my 550f from carpy's and he said i lose top end because the smoothness of the bends and the fake baffle lets out all the pressure prematurely.  that being said, he claims that the yoshi pipes in that style was made for the 450 where there are actual numbers available.  he meant r&d.  he doesn't know how it will work for the 550 or 750 in terms of actual performance improvement.  but since we all know we still want these pipes, he said that he can heat up and bend the headers to fit the 550 and probably works for the 750 also.  the original he showed me still provides easy access to the oil filter.  the lossa and carpy versions block the oil filter.

Roy, have you {or your mechanic} ever seen a real Yoshi race pipe.? Smooth as a baby's bum, those cut bends are done because its cheaper and is a recent thing, they  never had sharp bends in the 70's at all, your mechanic really has no idea. The smooth style with the swooping headers is the real Yoshimura pipe and seeing's though they were raced quite successfully on hundreds of bikes, and at ridiculously high revs, that "story" holds no weight at all. Actually, look at nearly all 4 into 1 pipes, show me how many have abrupt, sharp bends in the tail pipe section..?   Yep, none.....  If your mechanic did know what he was talking about he would tell you that, depending on the track and the speeds needed, Yoshimura altered the length of his pipes to tune them for certain tracks, he NEVER put sharp bends in the pipe at all.

Maybe he was referring to the Yamiya pipe? it certainly looks like it has sharp bends from the picture.(not that he was referencing the picture btw)

[Retro Rocket]

Yes, thats what i was talking about, the Yamiya pipe has the original header type but doesn't have the original tail section of the pipe, the sharp bends were never a feature of any Yoshimura period pipe..... To suggest that the smooth bends restrict engine revs is wrong and proven by the success of the earlier race bikes, and the fact that all performance pipes have smooth bends....

[RoyCB550]

According to my mechanic, Taka (the famous honda whisperer) you want the ones with the sharp bends.  it was made like that on purpose to create back pressure per sharp bend.  which is why the baffle on the originals didn't need to be as restrictive.  but at the same time its more restrictive than the ones lossa and carpy claims to be a removable baffle.  i bought one for my 550f from carpy's and he said i lose top end because the smoothness of the bends and the fake baffle lets out all the pressure prematurely.  that being said, he claims that the yoshi pipes in that style was made for the 450 where there are actual numbers available.  he meant r&d.  he doesn't know how it will work for the 550 or 750 in terms of actual performance improvement.  but since we all know we still want these pipes, he said that he can heat up and bend the headers to fit the 550 and probably works for the 750 also.  the original he showed me still provides easy access to the oil filter.  the lossa and carpy versions block the oil filter.

Roy, have you {or your mechanic} ever seen a real Yoshi race pipe.? Smooth as a baby's bum, those cut bends are done because its cheaper and is a recent thing, they  never had sharp bends in the 70's at all, your mechanic really has no idea. The smooth style with the swooping headers is the real Yoshimura pipe and seeing's though they were raced quite successfully on hundreds of bikes, and at ridiculously high revs, that "story" holds no weight at all. Actually, look at nearly all 4 into 1 pipes, show me how many have abrupt, sharp bends in the tail pipe section..?   Yep, none.....  If your mechanic did know what he was talking about he would tell you that, depending on the track and the speeds needed, Yoshimura altered the length of his pipes to tune them for certain tracks, he NEVER put sharp bends in the pipe at all.

first, i never said the one i was referring to was from the 70's.  i never said it was one of the first ones he made.  however, the pipe was a real Yoshimura brand exhaust from japan that went on a 450.  second, i never said anything about not being able to hit high revs.  you can rev as high as you want, don't mean you're going as fast as you should.  all im trying to say is, the one with the hard bends is better than the lossa or carpy's version which didn't have a real baffle.  on stock, mine was detonating when i had my replica. btw, my mechanic's full name is Hidetaka Takasaki.  look him up.  he's a nice guy. 

[Retro Rocket]

Gday Roy.

how many race pipes have you seen that is that short in the hundreds of races you are referring to?

Lots, all the 1970's Yoshi's {and we were talking 4 cylinders here} were shorty, as you call it, pipes.

almost all race pipes are baffled down to about a quarter size opening.

Since when, there's plenty of racers here that will dispute that, and i have owned both the real Yoshi pipe on a 750 as well as on a 900 Boldor, no cut and shut at all and the race baffle {which i have one in front of me now} is only a couple of mm wide leaving at least 80- 85% of the rear open. I have owned race bikes and have friends that have raced since the early 70's and i can tell you that most didn't use any baffle at all until noise regulations kicked in.

but the yoshi im referring to has a bigger opening in the end.  so for that one, the bends did matter.

Sorry but thats entirely wrong, like i said, i have a Yoshi race baffle that is extremely open and my pipe has the smooth bends, so did the other Yoshi pipes i have owned. You sure it is actually a Yoshi {once again i am talking SOHC4's} Even the Yoshi pipes made for the GS1000 looked the same as the Yoshi made for the 750/4 Almost identical, and short.

if it came to racing, i wouldn't slap on an exhaust from the 70's, i would put on the latest race pipe that would match what my bike puts out. 

If i was racing a modern bike So would i and none have abrupt changes in the rear section of the pipe. The 1970's Yoshi pipe was fitted to bikes with around 100HP that were race winning bikes, you said your mechanic stated that the bikes wouldn't rev out which is also wrong.

i was also just trying to say that the ones with the sharp bends is better than the lossa or the carpy's which didn't even really have a baffle

That is an opinion only and doesn't prove your point either way, and the guy that was making the Yoshi pipes for Carpy is also a Yoshimura engineer that makes pipes for moto GP bikes {moto GP werks is the business} and other high end race bikes, he hand made my current pipe which just happens to have a race baffle also. You can still buy race and road baffles, they are 2 completely different animals.
http://www.motogpwerks.com/custom-projects.html

Bottom right picture is my current pipe. It has the "road" style headers, not the swooping style of the race pipe.
Yoshi makes both Race and Road pipes and i have seen at least 3 versions from the 70's.

As far as your information source is concerned, Talk to forum member Kos, he has been around these bikes since Dick Mann won Daytona on a CR750 in the early 70's, he is a world expert on these Honda race bikes, he is also the owner of M3 racing.
 No Yoshi race pipe  had those sharp bends in them at all, none.  The Japanese pipes you refer too are the Yamiya pipes that are sold under a couple of different brand names, they are NOT a race pipe and are made for the street aftermarket, they also have 2 different types of baffles for them, one very open one and a quieter version with packing. All the race bikes that ran 4 into 4 pipes had no baffle at all either {swarbricks in the UK make them}, open pipes only.  Remember that we are talking about 4 cylinder pipes here . I would love to see a picture of a modern race pipe {and i have seen plenty} that have the cut and shut rear section, including new Yoshi pipes.....

if it came to racing, i wouldn't slap on an exhaust from the 70's,

Well i am building a 1000cc beast that will be sporting one of these pipes and i expect around 100HP out of this old K2.....The pipe will have no trouble at all keeping up with the engine, changing pipes would be just splitting hairs. Drag pipes don't generally run baffles either....Some barely even run a tail pipe.....

but i can show you a race muffler from japan

You do know that most of the better race pipe manufacturers aren't based in Japan.?  I can also show you race pipes with no baffle at all.....

I don't want to argue this with you but i have owned a myriad of bikes{around 40} and have had some very fast bikes and race bikes {street and drag}, worked in bike shops and pit crewed for racers and what you are telling me here just doesn't add up......