Topic: Yamiya "lotus" pipes (VIDEOS)

[tweakin]

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.

[tweakin]

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. 

[754]

I had a set of unnumbered pipes..the baffles were about 8 inches long..

[Stev-o]

*For racing purpose only and not for highway use*

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

[tweakin]

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!

[Don R]

 Cool, I just sold a set of new Harley mufflers to a guy gutting his new Harley exhaust. Your plan sounds more wise.

[andy750]

Good choice Tweakin! I am looking forward to the YouTube video for the sound of these

cheers
Andy

[Keith]

NICE bike!!

[PeWe]

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

*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.

[Jerry Rxman Griffin aka MuthaF'er]

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.

[Don R]

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.

[tweakin]

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.

[Stev-o]

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....

[ekpent]

 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.

[tweakin]

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.

[754]

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.

[PeWe]

I look forward to a sound check!!
Totally open will work fine?

[tweakin]

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

[ekpent]

 I like the sound with the baffles in, think it will sound nice going down the road also.

[tweakin]

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.

[Stev-o]

Sounds great!  Thanks for sharing the clips.  Interesting paperwork that they included...

[Tews19]

That is for sharing! Baffles in if it were me!

[tweakin]

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...

[flybox1]

baffles in sound sweet! 

[nvr2old]

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.