Jetting on 40mm round slide Mikuni for Srv .

Srv560

Srv560

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Joined
Mar 22, 2015
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Location
Lake barrington IL
Just completed the carb install with the exciter II secondary. Yamaha nuts gave me the jetting spec's. Just wondering if I should add a extra hole in air box for more air and would u have to change my jetting ? Also does anyone no if the U.F.O is a good add on for the carb and would it do any improvement for performance with that pore intake manifold? Thanks for any input.


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Srv560 said:
Just completed the VM-40 carb install.
Yamaha nuts gave me the jetting spec's.
Just wondering if I should add a extra hole in air box for more air and would I have to change my jetting ?
Also does anyone no if the U.F.O is a good add on for the carb and would it do any improvement for performance with that pore intake manifold ?
Click to expand...
Start with no extra holes in your air box.
You can always open it up if the engine demand more air.
The U.F.O. is a good add on to any 2-stroke Engine that has Mikuni VM carbs.
It will give you much better throttle response.
 
Last edited:
Thanks. Just trying to get everything I can out of the motor performance wise. That doesn't cost a lot of money. The only problem I have now is the back rear shock. I tried two used ones and can't get the one inch sag. It seat from the ground to the back running board at 12 inches and goes down to 9 1/2 inch and when I jump on it. It bottoms out?


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Srv560 said:
Now I have problem with my rear skid shock.
I tried two used ones and can't get the 1" sag.
It seat from the ground to the back running board at 12"and goes down to 9 1/2" and when I jump on it.
It bottoms out ?
Click to expand...
You adjust the sag with the spring pretension.
 
Last night I ran the nut on the spring as far as it would go. I now have two 1/2 sag can't get the one inch. Time for a new shock? This happen last year. Had this problem but when it got cold out things worked fine . Can temp have something to do with the gas in the shock. I just pulled the skid out this morning. I am sick of all the squealing noises when I stand up and down in it. Thanks


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