i did another compression check today bc i had her running. not good 75 psi. the bottom piston ring is broke.
the cylinder wall only has a tiny scratch. thank the lord
ran good then cut off now wont start
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Re: ran good then cut off now wont start
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Re: ran good then cut off now wont start
The reason the ring broke is what I'd be concerned with. Possibly during installing the piston into the bore? Could be they weren't seated yet and too much rpm? 8-10 tanks of fuel before WOT is my formula. Not saying you did anything incorrectly. I would be sure to slightly chamfer the tops and bottoms of the ports as they meet the cylinder wall. This helps to minimize ring wear over the life of the bore. I'd inspect for other fragments in the motor also. Buy two NEW rings and a 45mm flex-hone(amazon.com) and NEW base and head gaskets. Fun stuff, huh?
Honda Elite SR
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Re: ran good then cut off now wont start
makes me wanny cry. she was running so good too.bonesv wrote:The reason the ring broke is what I'd be concerned with. Possibly during installing the piston into the bore? Could be they weren't seated yet and too much rpm? 8-10 tanks of fuel before WOT is my formula. Not saying you did anything incorrectly. I would be sure to slightly chamfer the tops and bottoms of the ports as they meet the cylinder wall. This helps to minimize ring wear over the life of the bore. I'd inspect for other fragments in the motor also. Buy two NEW rings and a 45mm flex-hone(amazon.com) and NEW base and head gaskets. Fun stuff, huh?
i hate spending money.
- Wheelman-111
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Re: ran good then cut off now wont start
Wheelman-111
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Most of my money is spent on scooterparts. The rest is just wasted.
"ISO": '03 Vespa ET4 Malossi187 74MPH
Flash 9: 2001 Elite SR Contesta 72 ZX Tran, 9:1 Gears, Stock Airbox/Carb/Pipe 58.8 MPH
Punkin: 2010 Vespa/Malossi S78, 61MPH
Re: ran good then cut off now wont start
You are aware that those flex hone balls will catch and break on the ports, then the metal end of the wire WILL scratch the cylinder walls. Never a good idea to use a flex on on a 2 stroke.
Bear 45/70
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
Re: ran good then cut off now wont start
You just keep finding out new stuff every day. You guys are the best! Bear? what DO you use to hone your 2-strokes with? I haven't had that experience with the flex-hone yet, but 'ya got me scared now!
Honda Elite SR
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Re: ran good then cut off now wont start
This is what I used on my outboard race motors but the bores were over 2".bonesv wrote:You just keep finding out new stuff every day. You guys are the best! Bear? what DO you use to hone your 2-strokes with? I haven't had that experience with the flex-hone yet, but 'ya got me scared now!
http://www.google.com/products/catalog? ... CHoQ8wIwAA
So far all my scooter cylinders have been honed by the machine shop as I haven't had a "hone and re-ring" scooter jug yet.
This will work;
http://www.google.com/products/catalog? ... CHoQ8wIwAA
You have to be careful and make sure the stones always span the ports. I always taper the port openings while doing porting.
Bear 45/70
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree
'83 Aero 80 X 3
'84 Aero 80 X 3
'85 Aero 80
'84 Aero 125 X 2
'84 Aero 125
'84 Aero 125 X 2
'85 Aero 50
'85 Spree