hello,
I have just purchaced an 01 Raptor and I know the valves have never ben adjusted. This thing will run about neck and neck with a piped,jeted and K&N 400EX down a quarter mile. Is this normal for a raptor or do you think I need to adjust my valves. I also have a servece manual I downloaded so I should be able to figure it out. I put a compression tester on and got 135 PSI then I put oil into the clynder and got 155 PSI witch means i have about 20 PSI lost in commpresion due to scraped piston. I know this is way low compression seeing minium is 145 and reckomended is 187. Do you think the rest is in valves or could it be somthing elce? I really want to get my commpresion up atleast a bit beond the minium.

Thanks,
Rob

 

At that age undoubtedly it's ready to have the valves adjusted. It's not hard to do, you have that inspection plate that pops off and it's all right there, kinda tight but not that bad. You'll pick up some power for sure. You should kill a Z400 in a drag.......I have both so I have first hand experience.

 

aright I will pop the cover and take a look. also what is a z400

 

Yeah I'd go through the engine and clean it up a bit. You shouldn't be neck and neck you should be well ahead even if the Raptor is stock.

..and a z400 is a Suzuki 400cc 4 stroke.

 

Ya ill put it on my to do list and it isent neck and neck its a bit faster and this is through lower gears. Higher gears it flys. Do you think i also need to clean out the carb? I hear they can be a pain tho.