36mm or 38mm ??

[BIG TOOL]

All right "experts" Here's one for ya, How do I tell what carb is on my '10 300. Is it a 36mm or a 38mm. And which one works better? Thanks!

[Jakobi]

Not an expert or even close.

If your 2010 came with the PWK ASII it will have a smaller bowl than the older models and a flat metal cap which is held down by 2 screws. On the top of this cap will be a circle with a number printed in it. 36/38.

If its the older style with the screw cap odds are it is a 38mm. Not sure if anyone reported 36mms sneaking through with these. Think it was more a 2011 thing actually.

The KTMs use 36mms so you can get it to work for you. It will flow better at lower velocities. Smaller openings. Will sign off a bit up top. The opposite for a 38mm. Ideally you'd want an oval bore to get the best of both worlds. Thats what I'd be doing if I had a 36mm.

[Simmo737]

The pwk as11 is also known as pwm and looks like this

http://www.keihin-us.com/am/products/pwm.php

If you have it on a 300, consider yourself lucky believe it or not, it adds punch and as jakobi says, get it oval bored to 39 mm or get your squish corrected and it has plenty of top end, infact if your in the us, get the rb head mod before you do anything as its the cheapest mod and it will prolly be enough unless you ride desert long haul only!

[BIG TOOL]

Big THANKS guys!
It appears as though I have a PWM38 on my bike. So, this is supposed to be a good one? Is there much difference in jetting it?, or is it pretty much the same as any other 38mm GASGAS 300 carb?

[twowheels]

Originally Posted by BIG TOOL

Big THANKS guys!
It appears as though I have a PWM38 on my bike. So, this is supposed to be a good one? Is there much difference in jetting it?, or is it pretty much the same as any other 38mm GASGAS 300 carb?

Dig through the carburetor sub-forums - there is a wealth of information there. Just beware that the 2011 established a new baseline in jetting, so you'll need to be careful that what you're reading is applicable to your model.

[Jakobi]

Originally Posted by twowheels

Dig through the carburetor sub-forums - there is a wealth of information there. Just beware that the 2011 established a new baseline in jetting, so you'll need to be careful that what you're reading is applicable to your model.

I think you'll find the baseline changes for the 2011 were more of a result of the change away from the screw top capped carb. The new style seem to like much leaner jetting.

My bike is a 2010 EC300 running the same PWK ASII/PWM 38mm. As stated jetting section has many threads, and my findings are about the same as those running the 2011's. Then again my bike was shipped as a 2010 Euro but around the same time as the 2011 EC300 Kicks. Same everything except for headlight and fender. Euro came with Ohlins shock and different valving in the forks.