Author Topic: Yamiya "lotus" pipes (VIDEOS)  (Read 7421 times)

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Offline tweakin

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Yamiya "lotus" pipes (VIDEOS)
« on: June 15, 2017, 09:51:39 PM »
Cheers all!  Been awhile since I have posted.  Been building vintage Honda mini bikes while taking a break from the larger Hondas. 

Has anyone tried these, thought?   http://www.yamiya750.com/index.php?main_page=product_info&cPath=246_251_142_88&products_id=133

Many of you know I have the 341 repops on my JDMK1 and they are nice pipes but I want a bit more performance while keeping the stock look. 

Here is the bike; 836, headwork, cr29's etc.
« Last Edit: June 21, 2017, 05:52:19 PM by tweakin »

Offline tweakin

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Re: Yamiya "lotus" pipes?
« Reply #1 on: June 15, 2017, 10:26:20 PM »
My understanding is that the first handful of 1969, sandcast, 750's came with the "no stamp" pipes with the lotus root baffle.   I think these will help my bike breath better and I have heard the sound is awesome. 

Offline 754

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Re: Yamiya "lotus" pipes?
« Reply #2 on: June 15, 2017, 10:36:28 PM »
I had a set of unnumbered pipes..the baffles were about 8 inches long..
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Lost quite a few CB 750's along the way

Offline Stev-o

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Re: Yamiya "lotus" pipes?
« Reply #3 on: June 16, 2017, 06:50:52 AM »


*For racing purpose only and not for highway use*

I always like seeing this in ads for parts I want for my street bike!


'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline tweakin

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Re: Yamiya "lotus" pipes?
« Reply #4 on: June 16, 2017, 09:12:01 AM »
We think the same way Steve-o!  What I have read, the pipes were on the first sandcast bikes and have a different design and baffle than 300's.  If you remove the baffles you pretty much have megaphones.

I know they are not correct for my K1 but after a few IPA's I pulled the trigger.  Love the sound and they should give me a decent improvement in performance over the 341 repops I am currently running.



*For racing purpose only and not for highway use*

I always like seeing this in ads for parts I want for my street bike!




Offline Don R

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Re: Yamiya "lotus" pipes?
« Reply #5 on: June 16, 2017, 10:42:05 AM »
 Cool, I just sold a set of new Harley mufflers to a guy gutting his new Harley exhaust. Your plan sounds more wise.
No matter how many times you paint over a shadow, it's still there.
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Offline andy750

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Re: Yamiya "lotus" pipes?
« Reply #6 on: June 16, 2017, 10:43:49 AM »
Good choice Tweakin! I am looking forward to the YouTube video for the sound of these ;)

cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline Keith

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Re: Yamiya "lotus" pipes?
« Reply #7 on: June 16, 2017, 12:00:39 PM »
NICE bike!!

Online PeWe

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Yamiya "lotus" pipes?
« Reply #8 on: June 16, 2017, 12:01:33 PM »
Good choice to your really nice bike!

I read that the first 4148 CB750 sandcasts had the Lotus Root pipes.
http://www.cb750sandcastonly.com/support23.htm
http://www.cb750sandcastonly.com/differences09.htm

Open pipes without any restricting crap inside ;)
My bike need a set since it flattens out at 8500 rpm with HM300 replicas, DP315 cam must like more, at least strong 1000 rpm more. My engine has 1005cc so there are some gases that want out 8)

*For racing purpose only and not for highway use* 
This will fit ported head w 34mm inlet valves with slim stems, DP315 cam, 1005cc JMR billet block, APE ultra crank w Carillos and lightened alternator, + undercutted trans+ Mikuni TMR32 carbs.
It's a must and let that parts produce the power it can give.

I should order now if I could. I have to prioritize my family and vacation in Greece. I have to wait. Yamiya750 will get a batch in July too.

My HM300 replicas will fit my K2 project.
« Last Edit: June 16, 2017, 11:58:58 PM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Yamiya "lotus" pipes?
« Reply #9 on: June 16, 2017, 12:44:02 PM »
Tweak.... you may "NEED"  ;) to go larger than the CR29's too.

Don.... if your friend needs a new Harley exhaust I have the new take off from my 2003 Fat Boy stashed away plus a few other things too. You could pick them up for him if you come to the Reunion. Cheap too.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Don R

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Re: Yamiya "lotus" pipes?
« Reply #10 on: June 16, 2017, 01:03:55 PM »
Tweak.... you may "NEED"  ;) to go larger than the CR29's too.

Don.... if your friend needs a new Harley exhaust I have the new take off from my 2003 Fat Boy stashed away plus a few other things too. You could pick them up for him if you come to the Reunion. Cheap too.

 Thanks Jerry, I got a set free but he's annoying so I sold them to him for $40. He tried to gut his mufflers but one is too hard to do so he bought my set so he can gut 2 easy ones.
 I'd love to hear the lotus root pipes. I still think Hooker 4-2's are the best sounding 750 pipes so far.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
 You don't need a weatherman to know which way the wind blows.

Offline tweakin

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Re: Yamiya "lotus" pipes?
« Reply #11 on: June 16, 2017, 01:38:28 PM »
Here is the sound clip video from Yamiya's site, not the best sound quality.


Once I get them, I will do a before with 341's and after with the lotus root pipes.  Possibly a video with the baffles out aswell. ;)

Offline Stev-o

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Re: Yamiya "lotus" pipes?
« Reply #12 on: June 16, 2017, 02:53:05 PM »
Here is the sound clip video from Yamiya's site, not the best sound quality.


Once I get them, I will do a before with 341's and after with the lotus root pipes.  Possibly a video with the baffles out aswell. ;)

Plz do....
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline ekpent

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Re: Yamiya "lotus" pipes?
« Reply #13 on: June 16, 2017, 05:04:04 PM »
 I think I have read that the first no number pipes had no internal baffle chambers, just a removable baffle. Then the HM300 came along and still had a removable baffle but I think possibly 3 internal chambers. Lastly the HM341's with no real baffle just a cap 'diffuser' on the end and possibly 5 internal chambers.  Those facts may need correcting but you get the idea.

Offline tweakin

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Re: Yamiya "lotus" pipes?
« Reply #14 on: June 16, 2017, 05:31:04 PM »
Yes, that is what I read as well.  Can't wait to get them on the bike.
I think I have read that the first no number pipes had no internal baffle chambers, just a removable baffle. Then the HM300 came along and still had a removable baffle but I think possibly 3 internal chambers. Lastly the HM341's with no real baffle just a cap 'diffuser' on the end and possibly 5 internal chambers.  Those facts may need correcting but you get the idea.

Offline 754

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Re: Yamiya "lotus" pipes?
« Reply #15 on: June 16, 2017, 06:30:08 PM »
Don R the hog mufflers from the nineties, I put in a fixture and used a holesaw to cut out the inner core. That way you could weld it back in. It worked too. Bored an 883 to 1200, hemi shape in the head, stock carb and cover, less filter, the gutted mufflers... 12.7 ...first time out.
 Back to the unnumbered pipes I had.. Dont know about the lotus root....but.. I could probably draw what the baffle looked like, but not to scale.. Not sure but I think pipe was pretty empty with baffle out. I was luvkyvto find the pipes, they went on #572.... But I never heard it run.
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Online PeWe

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Yamiya "lotus" pipes?
« Reply #16 on: June 17, 2017, 07:16:25 AM »
I look forward to a sound check!!
Totally open will work fine?
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline tweakin

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #17 on: June 21, 2017, 06:06:45 PM »
Got the Lotus Root pies installed today and I am more than happy with the sound and performance vs the re-pop 341's I was running.  The pipes are wide open with the exception of the one internal piece that the baffle rest on.





341's


Lotus Root


Lotus Root (-) Baffles
« Last Edit: June 21, 2017, 06:17:07 PM by tweakin »

Offline ekpent

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #18 on: June 21, 2017, 06:34:03 PM »
 I like the sound with the baffles in, think it will sound nice going down the road also.

Offline tweakin

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #19 on: June 21, 2017, 06:40:27 PM »
I like the sound with the baffles in, think it will sound nice going down the road also.
I agree, the baffles will not come out again.  I removed them just for the video.

Offline Stev-o

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #20 on: June 21, 2017, 07:03:44 PM »
Sounds great!  Thanks for sharing the clips.  Interesting paperwork that they included...
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Tews19

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #21 on: June 21, 2017, 07:24:30 PM »
That is for sharing! Baffles in if it were me!
1969 Honda CB750... Basket case
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Offline tweakin

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #22 on: June 22, 2017, 07:26:41 AM »
Yes, the baffle is about 8 inches and is pretty solid.  if one happened to come out on the highway it would do some damage to any following vehicles.
The pipes themselves are significantly lighter than the 341's.
Sounds great!  Thanks for sharing the clips.  Interesting paperwork that they included...

Offline flybox1

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #23 on: June 22, 2017, 08:01:40 AM »
baffles in sound sweet!  8)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline nvr2old

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Re: Yamiya "lotus" pipes (VIDEOS)
« Reply #24 on: June 22, 2017, 09:23:58 AM »
I was thinking the same thing before reading responses, that it sounded better with the baffles.  The whole package just sounds tighter and smoother.  Nice choice, Tweakin, and such a pretty 750, too.
'76 CB550F-'72 XL250-'82 MB5-'82 CX500 Turbo-'77 naked Goldwing-'75 CB400F cafe'-'79 Suzuki GS1000S..hey, it's a Wes Cooley..