First of all "hi guys Im Doug and new to this so please forgive any procedure stuff ups, I'm after any info, recomendations or heads up warnings on big bore stroker kits for my 2009 KLX250s or any alternative modifications that may be better. Any info will be greatly appreciated. CHEERS

 

I too am interested in this topic, as I intend adding a fair bit of weight to my ride (heavier panniers, fuel containers, engine guards etc)

I'm generally happy with the stock power (EFI) but some more ponies would be welcome, sometimes

 

ive had the 351 kit for 2000 miles now with the stock pipe and intake and it adds just enough where i am happy everywhere! I dos add a bit more vibration but its manageable

 

Do you have a link to where i could get product and purchase info? this would be very helpful.
The vibration wont be such a problem as most of ride time will be in the dirt,
I have also added FMF power bomb header pipe and power core4 slipon

 

Do you have a link to where i could get product and purchase info? this would be very helpful.

 

Kustom Kraft 331cc bored and nikasil plated https://www.kustom-kraft.com/big-bore-kits

Bill Blue 331 and 351cc bored and sleeved Home Page

Chinese AHL 299 kit (actually 292cc Rancine copy)
There is a guy on here that sold his remaining 331cc kits but still has a discounted 308 kit deeply discounted. Actual 308cc and not 292cc like a KLX 300.

You can still buy OEM Kawasaki KLX 300 (292cc) cylinder, piston etc from Kawasaki.

 

I love my kustom Kraft 330 kit. I went with it because I believe other than the Kawasaki 300 jug, it is the only nikasil coated big bore cylinder you can get, which is why it costs more.

 

The AHL 299 kit is plated too. That was pointed out in their questions on Amazon. The BB 351 has to use a liner, I believe, because it actually takes out part of the cylinder to the point of being a wet liner. That has been a point of question for some, because it reduces the coolant volume in the cylinder. From some who run the 351 in warmer climates, it isn't a problem though.