10-26-2009, 05:32 PM #1
couple of questions about my sl700 rebuild
Hey fellas. 2 quick questions about my sl700 rebuild.
1. One of the 2 pistons is shot. The other has some light scoring on it. How much scoring is too much scoring? Are there any rules on this similar to brake rotor grooves and the penny measurement method? I think I'm gonna have to go with 2 new pistons but just wanted to ask.
2. I tested the stator (still has gen 1) and all the measurements check out except the blk to purple. Supposed to be 1200 ohms but its like 200k ohms so I assume it's shot. I can get a good gen 1 stator from Zig for $100. Do you think I should go this route or just get the update kit for ~$300?
10-26-2009, 05:37 PM #2
" From question 1 " ANY! Scoring is bad. But the REAL Question is, Why did the piston get scored?. From a lean condition possibly,Lack of a good oil system, leaks,missing,cracked hoses, air leaks in the case possibly.carbs. I'd go through it and find the culprit!
Then 2 new pistons and a .25 bore over and Run it with a new gasket kit for everything would be a wise investment.
New parts depend on other new parts to stay working together!. Just my 2-cents.
10-26-2009, 06:23 PM #3
- Join Date
- Jul 2007
- near Toronto, Canada
If you feel lucky, you can certainly try the $100 (plus shipping) Gen 1 stator only replacement.
If you don't want to risk having to remove the flywheel and do it all again, then the Update Kit is the more certain option. It will work, and it will continue working.
I don't really know if the Gen 1 reliability problem was all about the stators failing, or if the Gen 1 CDI were also less reliable.
10-26-2009, 10:11 PM #4
Yeah, when the top end was repaired they only thumb tightened the nuts on the jug so I'm sure there was a major air leak.
I'm going to go with 2 new pistons and the update kit.
BTW, I was looking closely at the better of the 2 pistons and it says 80.85 on it. I also measured it and the cyl and both are below the 81mm standard, what gives?
10-27-2009, 07:07 AM #5
Wait for others to chime in on this. I have no clue!
10-27-2009, 10:26 AM #6
As far as the piston markings = the aluminum piston will swell as it heats up, the spec for piston to cyl clearance is 0.14-0.16mm. So 80.85 + 0.15 =81mm.
What is the part #'s on the cylinder ?
10-27-2009, 08:41 PM #7
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