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 Rebuilding (trying) a 1976 T140V
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Joined: May 2007
Posts: 16
Complete Newb
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OP
Complete Newb
Joined: May 2007
Posts: 16 |
I just recently bought this bike for $500 (didn't run,wiring was shot)and started tearing her down and was wondering what the consensus was on reboring the cylinders. Took the head off and the pistons move smoothly in the cylinders (no side to side)but the tops are covered in carbon. I was originaly just going to clean everthing, install some new rings and call it good but with the look of the pistons I'm thinking of replacing them as well. If your for reboring what oversize? .020, .040, .060?
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Re: Rebuilding (trying) a 1976 T140V
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Joined: Feb 2005
Posts: 988
3/4 Throttle
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3/4 Throttle
Joined: Feb 2005
Posts: 988 |
I wouldn't get that excited if there is no side to side movement and no scoring. I would just clean them up and use them. If you do decide to bore you just normally go to the whatever size it takes to clean up any imperfections or out of round issues. Again I wouldn't be that concerned about some carbon buildup. Clean it! 
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Re: Rebuilding (trying) a 1976 T140V
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Joined: Jan 2005
Posts: 8,639 Likes: 3
Old Hand
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Old Hand
Joined: Jan 2005
Posts: 8,639 Likes: 3 |
Measure them up and, if in spec, forget it. Just lightly hone the cylinders and replace the rings.
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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Re: Rebuilding (trying) a 1976 T140V
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Joined: Jan 2005
Posts: 6,821
Bar Shake
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Bar Shake
Joined: Jan 2005
Posts: 6,821 |
If you're going to take the pistons out anyway, mike the bores. Check out of round and taper. If OK; hone, rings, ride  If it needs reboring, go with the minimum needed.
Last edited by bigbill; 07/04/2009 12:07 PM.
Contra todo mal, mezcal; contra todo bien, también
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Re: Rebuilding (trying) a 1976 T140V
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Joined: Dec 2006
Posts: 7,028 Likes: 8
New Tires
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New Tires
Joined: Dec 2006
Posts: 7,028 Likes: 8 |
I would have replaced the wiring harness, changed the oil, new battery and gas. Then would have seen if it would run and went from there. That said call Mike Jones at Engle Motors.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
H. L. Mencken
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Re: Rebuilding (trying) a 1976 T140V
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Joined: Feb 2007
Posts: 23,195 Likes: 56
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,195 Likes: 56 |
another thing is to see what the piston is marked, if it is already 60 or more over look for used (or new) cyl. I know it is possible to go farther but I was never comfortable with it.
Like everyone else has said, if you can get away with a quick hone and re-ring that's what you do or of a bore is needed go the minimum you need.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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