4 Stroke Compression Test

[LiftdT4R]

Ok, now that my 2002 is back together, I want to get my Kawie runnin' for the winter. It's a 1998 Bayou 300 4x4. I bought it off a buddy a few years back, and it ran great, but then it sat for 2 years, and now when you start it up it just spits and sputter. All the stale gas needs to be cleaned out, and the carbs need to be cleaned out too, and I'll change fluid, the whole 9 yards. I was going to do a compression test just to make sure the rings and head gasket are still good too.

 

I guess my question is what kind of pressure should I be looking for? I know on a stock banshee 130PSI is good, but I would think that would be too high on a 300cc 4 stroke Bayou. I was thinking more to the order of 100PSI or so, but I have no clue. The Clymer manual for this bike says that Kawie doesn't give a pressure, so it says nothing. As al;ways, thanks for the help! :beer:

[jbooker82]

Ok, now that my 2002 is back together, I want to get my Kawie runnin' for the winter. It's a 1998 Bayou 300 4x4. I bought it off a buddy a few years back, and it ran great, but then it sat for 2 years, and now when you start it up it just spits and sputter. All the stale gas needs to be cleaned out, and the carbs need to be cleaned out too, and I'll change fluid, the whole 9 yards. I was going to do a compression test just to make sure the rings and head gasket are still good too.

 

I guess my question is what kind of pressure should I be looking for? I know on a stock banshee 130PSI is good, but I would think that would be too high on a 300cc 4 stroke Bayou. I was thinking more to the order of 100PSI or so, but I have no clue. The Clymer manual for this bike says that Kawie doesn't give a pressure, so it says nothing. As al;ways, thanks for the help! :beer:

 

130 isnt to high for a that kawie. You go along the same lines. My craftsman snowblower with Tecumseh 9HP. Has 125 psi of compression. Same thing with the banshee. If it is around 100psi it is probably getting alittle tired. On thing you have to remember though is alot of 4strokes have auto decompression devices on the camshafts. They will hold an exhaust valve opean a little until it starts running. So if you get a low reading then i could possible be because of that too.

 

josh

[LiftdT4R]

Thanks for the reply man. The bike is a 98, but it probably only has 20 or so hurs on it since it was purchased new in 2000. My dad rode it for a 2 years in upstate NY from the house to the road and back, then it sat for 2 years there until I came, got it, and brought it back here. So I'm thinking it shouldnt be anything more then dirty ass fuel, and carbs, so I'll clean 'em out and hope it fires up.

 

I think it does have the auto decompress vale, it is an electric start, I'm not sure if that matters or not though. havent compression tested it yet, but I was thinking 130 would be high, but if it's not, it's not. Thanks again, I'm gonna get started on this thing tomorrow. :beer: