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Be aware that all of the air limitation into the engine has nothing to do with the intake capabilities of the air box on these machines. They will by stock design take in more air then the engine requires and are not restricting any air flow at all.. You can benefit from the colder air with the...

I gave the Yamaha part number. Its basically just 30lb engagement instead of 35lb. You can google the Yamaha Primary clutch chart for more details on it.

Attak stock clutch engagement is about 3800 RPM. And its definitely too harsh. These engines already have tons of torque at these RPM. Its most noticeable when backing up. Change to a Yellow Pink Yellow Primary spring 90501-581L5-00 . It will change your engage RPM to 2800ish but you keep the...

Mine would idle at 800-900 after getting fully warm and occasionally stall. I threw 2 cans of seafoam in a full tank and it now idles at 1100 warm and never stalls. I believe it was some gunk build up in the throttle body that messed with air flow. Seafoam can be added up to 50/50 for extreme...

It cool to look back through these old posts and see how things have changed over the years. 136-139 is now the sweet spot for trail machines. 121 are now mostly just on beginner sleds. All the top of the line trail models in 2021 and 2022 run 137" tracks with usually nothing less then 129 as a...