joshbot007

Member
Dec 4, 2012
30
0
On my bike if i pull out the kick start and put a consistant small force on it and hold the kick starter will slowly go down all the way. When kicking the bick it feels good and I feel like the bike has good compression. It was rebuilt with about 6-7 hours on it. Starts on firts kick. I was wondering if This is a 2 stroke thing with the exaust ports no valves. Like i said kick starting has good compression. It is a ktm 300
 

High Lord Gomer

Poked with Sticks
Sep 26, 1999
11,790
34
They all will do that to some extent. The only way to really measure it is to get a compression tester and check it. I like to check it immediately after a rebuild, after an hour of running, and then periodically to see if/when the compression starts to drop.
 

joshbot007

Member
Dec 4, 2012
30
0
The reson i ask this is because my 350 4stroke can barely do this at all when the auto decompressor is not on. It is very hard topress down even slowly. I asume this is because of valves. Thats why i would like to know if this is normal for 2 strokes.
 

2strokerfun

Member
May 19, 2006
1,500
1
You have intake porting and exhaust porting on the cylinder walls of a 2 stroke. There is just a small area above the ports where you don't have any ingress or egress of air. Having said that, it doesn't mean you don't need fresh rings, but there is always a ring gap that will allow pressure to escape doing what you describe.
 
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