I need some help understanding some compression issues.
Here's the deal: Front Cylinder at 120 lbs; Rear Cylinder at 90 lbs. Yeah, I know that's a problem :bigeyes: .
What would cause the difference in readings? Both were tested with no plugs in and WOT. I checked the reeds and they apear in tact (metal reeds) and the cages seem good too. So I took the head off... LOL... it's bad. The Rear Cylinder (left side in the pictures) with the lower compression seems to have a small flat spot on the side of the piston (top of pic) and both cylinders are SLIGHTLY loose.... so bad rings maybe?
I don't want to jump to conclusions though... could there be a bad bearing or seal blown out? But, if that were the case, wouldn't there be an equally 'low' reading in both cylinders... and shouldn't they have even readings? I just don't know enough about this part of engine work, and I have no idea what would cause two different readings.
I'll post pics in a few. Thank you all for any help!
Brad
Here's the deal: Front Cylinder at 120 lbs; Rear Cylinder at 90 lbs. Yeah, I know that's a problem :bigeyes: .
What would cause the difference in readings? Both were tested with no plugs in and WOT. I checked the reeds and they apear in tact (metal reeds) and the cages seem good too. So I took the head off... LOL... it's bad. The Rear Cylinder (left side in the pictures) with the lower compression seems to have a small flat spot on the side of the piston (top of pic) and both cylinders are SLIGHTLY loose.... so bad rings maybe?
I don't want to jump to conclusions though... could there be a bad bearing or seal blown out? But, if that were the case, wouldn't there be an equally 'low' reading in both cylinders... and shouldn't they have even readings? I just don't know enough about this part of engine work, and I have no idea what would cause two different readings.
I'll post pics in a few. Thank you all for any help!
Brad