01 summit 700 won't start! Need help!!!

Jonathanpitzl · Dec 5, 2013

I just rebuilt my summit 700 and now it takes a lot of pulls to start. Once it's started it runs fine. So I was riding yesterday and shut it off outside to go into my buddy's shop. An hour later I went to start it to leave and it won't start. So we let it sit in his 65 degree shop over night and it still won't start. It has fresh gas, sparks, carbs cleaned, exhaust valves cleaned and ready to go, we even tried putting gas down the cylinders and it just back fired. What do I do next?

BU1 · Dec 5, 2013

Check compression.

Jonathanpitzl · Dec 5, 2013

Did that

Ox · Dec 7, 2013

Jonathanpitzl said:
Did that

Result?

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Jonathanpitzl · Dec 8, 2013

The compression test was broke or something cause it showed both at 31 psi and it blew my fingers off when I pulled it over

8alltheway · Dec 8, 2013

Does it have any spark?

BU1 · Dec 8, 2013

Jonathanpitzl said:
The compression test was broke or something cause it showed both at 31 psi and it blew my fingers off when I pulled it over

Doesn't mean a thing. Test with another tester if you don't trust the first one.

Ox · Dec 8, 2013

Did you have the throttle open?

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Jonathanpitzl · Dec 8, 2013

Tested the compressing tester on an m7 and had 130, so the summit has good pistons and we took them off and spun the crack by had and I noticed the crank was bent, I could see the end that the clutch goes on moves when I spin it, how does this make for loss of comperssion?

Ox · Dec 9, 2013

Shouldn't have any effect on compression on a reed motor, but it will throw your timing out of whack.

You said that you had 31# on this motor.
If the tester showed 130# on the M7, then it sounds like you aint got no compression.

You said that you just "rebuilt" the motor, but it sounds like your reeds are for junk!

Did you pressure test both cyls?

.

Jonathanpitzl · Dec 9, 2013

Retested it and 41 # each wide open throttle. Noticed the crank is bent and seal is shot

Jonathanpitzl · Dec 9, 2013

The reeds are good

retiredpop · Dec 9, 2013

41# compression is why it won't start. Something definitely wrong with the top end for numbers like that. On top of that if the crank is not true it will take out the crank bearings in a hurry. When you rebuilt it what all did you do?

Jonathanpitzl · Dec 9, 2013

Left side piston and cylinder went bad, part of the ring broke off and bounced until it flew out of the exhaust, got a good used cylinder and and put spi pistons in it with new gaskets

Ox · Dec 10, 2013

Well - you could have left some small pieces down in the case when you put it back together, and they could have destroyed that side and cause 41#, but the other side?

It would be possible for a chunk to go out the Y pipe and get sucked back into the other cyl to destroy that one too, but ???

But having the same 41# on both sides seems REALLY strange!
I'm thinkin' that maybe you don't have something right on your comp tester.

At 41# both sides, you should be about pulling the rope out of the end of the recoil since it pulls over so easy. Does it pull over REAL easy with plugs in both cyls?

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summit800 · Dec 10, 2013

pistons installed backwards??

Jonathanpitzl · Dec 10, 2013

Pistons installed right, i could probably pull the sled over with 1 finger

retiredpop · Dec 10, 2013

Pull the y pipe off and turn the motor over so you can see the rings and pistons. It almost sounds like the rings are badly damaged. Probably the best thing to do would be to pull the jugs off and have a look at the top end.

jheitzman · Dec 10, 2013

Make sure you put the correct size pistons back in when you rebuilt it the first time in case it has been bored

Josh

Redsledhead · Dec 10, 2013

Jonathanpitzl said:
Retested it and 41 # each wide open throttle. Noticed the crank is bent and seal is shot

Thats not good . If the seal is out could easy burn down again. Time for a total rebuild:face-icon-small-sad

01 summit 700 won't start! Need help!!!

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