i have a yamaha blaster, just rebuilt has a wesco piston bored.20 over, toomey full pipe the jetting toomey gave me and the air filter also has no air box i am getting power now and a kn air filter with a out fitters exhaust, i was told the jetting needs to be changed

I need input for jetting

 

I'd recommend a very small size change with the set-up, but definitely go a bit larger to increase fuel to air ratio. Running lean will cause damage pretty quick. It will run hot due to the lean mixture, and will not cool well.

I would recommend taking a look at Toomey's website and seeing if they can help with best jetting.

I did some looking and FMF recommends a 260 for original piston/bore and their rig, I bet you'd need to go up a bit from there. Also it depends on several things to get optimum jetting. Including Altitude, Average Temp, Humidity, and fuel type and mix ratio.

Good luck

 

i live in wisconsin and i drive all year round does it matter to change jetting trough out the seasons or does it matter? can some one tell me a pecific size i need to use in my machine.

Yamaha Blaster
Toomey Pipe
K&K filter
Outfiters Prefilter
reeds
Wesco Piston .20 over
no filter lid
Removed the oil injector
Buying reed spacer