Modded Yamaha

[proprider01us]

Yamaha 40hp.

http://youtu.be/uqRzw5Tihu8

[Ballistic]

Looking nice bud.

Why no 70hp carbs?

[proprider01us]

I recently got a set of 70hp carbs, just haven't got them together yet. Those, and a spacer plate for the exhaust, are next.

[biggdave92]

question: how do you get the ring off the flywheel? i have a 25/30 3 cyl yamaha i'm playing with. looks to be pressed on the same way as the 40. love the pics and video!

[proprider01us]

Yes, the flywheel is pressed on. Reduced a lot of rotating mass gettin it off there.

[Karl Kretzmann]

Make sure that its the "square" type carbs! they much better than the " round " bowl carbs!

love what you've done with the yamaha!
i specialize in modifying Yamaha 50's and did something similar in early 2000's. will try to find some pics and post them!

what speeds are you running? what RPM?

what compression?
what internal mods?

[Ballistic]

Make sure that its the "square" type carbs! they much better than the " round " bowl carbs!

love what you've done with the yamaha!
i specialize in modifying Yamaha 50's and did something similar in early 2000's. will try to find some pics and post them!

what speeds are you running? what RPM?

what compression?
what internal mods?

Disagree, The round bowl ones run harder here... They burn the fuel harder too

[byrdsperformance@tds.net]

Why do you say square bowl 70 carb's ????

[byrdsperformance@tds.net]

why do you say square bowl 70 carb's ????

are BETTER

[Karl Kretzmann]

I found better airflow through the "square" carbs.
Also, depending on level of porting, I ran 90 carbs. Biggest limiting factor I found on the 50's were the reeds! I ended up modding the intake and fitted 6 petal reed block instead of the stock 4 petal! Made HUGE difference! Bare in mind there were many more mods required!!