35mm keihin

[DirtDiggler]

Buying a 35mm for the blasty , its .020 overbore and has fmf fatty , anyone have any jetting start points? i'm still down the road going to go 240 so thats the main reason i'm snatching this up . but for stock bore is it too much?
opinions?

 

[1bad442]

will be to big. bottom end power will be terrible, so if u ride trails its gonna suck

 

[Braaaptor]

will be to big. bottom end power will be terrible, so if u ride trails its gonna suck

^^Very true; a carb that big on a near-stock engine will make your low end power suffer, but you'll just have to put it on, run it, and see what you think.

The reason the engine's performance will suffer is that the large 35mm bore of the carburetor is too big to sustain the proper intake charge velocity. In other words, the near-stock engine in your Blaster can't generate enough vacuum from the crankcase to keep the incoming fuel/air mixture moving at sufficient speed through the carburetor's venturi. Incoming air will slow down as it goes through the carb and you may therefor feel a 'dead spot' during part-throttle operation. The condition will likely go away as the main jet comes on line past 3/4 throttle and the engine picks up speed.

I run a 28mm Keihin PWK carb on my Blaster, which is all stock inside. My jets are in my sig; you may want to try those depending on your elevation (I'm about 400' above sea level) and go from there. Good Luck!

 

[DirtDiggler]

Probably what I'll do then is just keepn the stock carb on it for the time being until I do the 240 on it . No sense in trying to tune it for that when I'll have to go through it all again . I'll shelf it until I need it

 

[bonzaiking]

i put a 32 on a stock piped blaster in my oppinion this was also to big

 

[245stroker]

Is your stock cylinder ported? tjsdaname ran a 35mm airstryker on his stock bore stock stroke and it ran hard. Even on the mx track. As far as jetting goes, there isn't much difference between the stock cylinder and a vito's 240. The same engine builder ported my cylinder and tj's and he was running a 155 main and I was running a 150 main.