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Author Topic: Should I Get Larger Carburetors? - Honda CL200  (Read 694 times)

Offline jpmobius

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Re: Should I Get Larger Carburetors? - Honda CL200
« Reply #10 on: Jan 21, 2019, 18:51:34 »

But whatever else you do, don't take anything one of us says as either the absolute truth or the right answer for you an your bike.  none of us has tested every possible combination or idea and what we are looking for may not be what you want.  Get a copy of the A G Bell book and see what others have done.  Keep searching and learning.

BTW, the best way to add performance is by adding lightness as Colin Chapman used to say.
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline Classic5

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Re: Should I Get Larger Carburetors? - Honda CL200
« Reply #11 on: Jan 22, 2019, 16:26:04 »
Hey All,

Thanks for the all the great tips! I was thinking about starting simple and pursuing the laminar flow on my stock carburetors, and found a wide variety of sizes and shapes and prices of velocity stacks available out there. Is there any rhyme or reason to picking one over the other? What makes one stack better than another?

Offline teazer

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Re: Should I Get Larger Carburetors? - Honda CL200
« Reply #12 on: Jan 22, 2019, 17:25:28 »
http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=268543

https://www.thesamba.com/vw/forum/viewtopic.php?t=643596

I think that the chart in that second post is from work down by David Vizard.   I'm pretty sure that A.G. Bell has info on shapes and lengths too.

Offline Turnturtle

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Re: Should I Get Larger Carburetors? - Honda CL200
« Reply #13 on: Jan 22, 2019, 17:58:21 »
There is plenty of theory and some useful info in this article by Gordon Blair.
http://www.profblairandassociates.com/pdfs/RET_Bellmouth_Sept.pdf

Offline teazer

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Re: Should I Get Larger Carburetors? - Honda CL200
« Reply #14 on: Jan 22, 2019, 22:20:54 »
And just to complicate things B;lair and Bell don't agree on the formulae, or put another way, the formulae do not always generate the same answers.

And in the real world, that is OK because the differences are small and are really only important at one rev range.