Engine Compression

[X-it]

I tested my Yamaha Bravo 250's compression and it is 135lb. I tried searching for what the compression should be on these engines and could not find it anywhere. It has a co zillion miles on it. Just wondering if that is OK.

 

[Summitric]

You tested the compression with the throttle wide open and pulled it about 4 - 5 times?

 

[X-it]

No throttle wide open.... just pulled it 4-5 times

 

[Summitric]

You need to hold the throttle wide open when pulling it over, to give you a true reading.... Try that and post your findings

 

[X-it]

Thanks I will do check that today sometime, and repost my findings. Some say 120 or more for it to run.

 

[X-it]

It might be 137 lbs with the throttle wide open. Almost the same though.

 

[rebel]

Same both sides? If so 137 is fine in my opinion

 

[CatMan16]

Same both sides? If so 137 is fine in my opinion

It is a one lunger

 

[rebel]

It is a one lunger

Lol so it is sorry

 

[Summitric]

Depending on compression guage(they all seem to vary in readings), i would suspect 135 - 140psi would be considered normal...

 

[X-it]

Hard to believe it is not dead, I was going to do cylinder piston and rings on it. I am just going to leave it. I think the odometer quit at 8000 kilometers 15 years back and that was before a dozen kids went through 5 gallons of gas every week on it for years. It started first pull...my goodness those motors are tough. Castrol cheap two stroke oil is all it has ever seen.

 

[rebel]

Did some reading on em. Apparently 20000 km is common on these with very little maintenance.

 

[neilsleder]

Do they even make replacement pistons for those sleds lol. I don't think they ever blow up! I tried to buy one last year, found a 2004 with 45km! But buddy wanted $7500 and wouldn't wiggle on the price

 

[X-it]

Well if I had to guess I would put the mileage at 20000 as well. And don't think this is going to ever blow up either.

 

[daddys girl]

just like the energizer bunny,they keep going and going and going

 

[Panzerdog]

I bought this one for $800 in Newfoundland and it even came with a spare motor. I am keeping it when my son is finished with it