Hot Cams - Post Installation Jetting

I just installed stage 2 Hot Cams(E/I) on my 06 DRZ 400S: The bikes setup:

Evo X Full Exhaust

Stock Carb with 147.5 MJ/25 PJ

Dynojet needle and spring from Stage 1 S kit

3X3 opening with Uni air filter

3 Turns out on the Fuel/Mix screw

After installing the cams, the bike started up fine. The bike idled okay. When riding, transitioning from the mid to the top range the bike studders/coughs, then takes off. It seems to run good as long as its accelerating, but when cruising then hitting the throttle.. studder...then goes.

I made the ride with the cork in the exhaust. I wonder if the exhaust restriction of the silencer is too much for the exhaust Hot Cam?:applause:

better or worse as it warmed up?

better or worse as it warmed up?

It actually starts getting worse as the bike warms up. I pulled the plug and it was not fouled or wet. I wonder if the cams are degreed wrong?

its just rich.try riding with the air box door off for a test.

its just rich.try riding with the air box door off for a test.

Thanks, I'll give it a try.

its just rich.try riding with the air box door off for a test.

I went ahead and put the stock main/pilot jet in. Runs great now, with and without the cork. Of course better without:thumbsup: The acceleration is out of sight. Riding at 10 mph, I gun it and was at 80 mph like that (15/41 gearing). I can't imagine what a big bore and a good carb would do.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now