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Post by tvnacman on Sept 7, 2013 17:09:59 GMT -5
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Post by endru on Sept 7, 2013 19:37:43 GMT -5
I got the same compression tester from harbor freight and had the same problem with the adapter turning in the hose. I put a drop of superglue on it, and problem solved.I can now get it tight enough for a proper seal.(easily undone with a couple of vise-grips) I don't think the engine would even run on 40 psi. has to be the tester. That's really good to know. I mean, it was pretty tight when the hose began turning in the adapter, so I thought it was nonetheless tight enough. I'll do the superglue and see what effect it has. |
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Post by alleyoop on Sept 7, 2013 19:45:05 GMT -5
Sailracer is correct, it is probably leaking where the hose goes into the adapter. And most motors will not run 100psi or less, some have a hard time running at 120psi.
Alleyoop
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Post by endru on Sept 7, 2013 21:12:50 GMT -5
[replyingto=alleyoop]alleyoop[/replyingto]I think I might just jb weld it there instead of super glue, I don't see why it would ever need to go back to rotating. I'm also going to it on my car and see if it goes over 40psi. Or take it back and exchange it for the one that doesn't use the quick fittings, especially since I'm going in to get the honer. Who knows... I hardly got any scooter work done today except for troubleshooting here on the forum. It was a very hectic day. I can't wait to get back to riding!
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Post by endru on Sept 11, 2013 16:03:59 GMT -5
I finally got the top end reassembled with the new rings. The compression tester still measured exactly 40psi. So I figured it was definitely the compression tester that had the problem. Tried it out on my car and it got 170 or so... with a different adapter though. So maybe only the adapter that fit my scooter was defective ... just to be sure I put a little oil in the cylinder. If it were a defective gauge then it should have stayed at 40 psi, right? Well with a little oil it went up to 60 psi.  3 thoughts: - The cylinder wall is defective, hopefully can be fixed with a honing. - The new rings are bad or installed improperly. Unlikely though, because I installed them with the logo-stamped side up and none of the gaps line up. Silver ring was at the top. - The tester adapter is in fact defective, and the little bit of oil that got poured in just raised the compression above what was normal and pushed just a little more air through the leaky adapter. Any ideas what's going on here? |
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Post by sailracer on Sept 11, 2013 16:56:41 GMT -5
valves are closing tightly and properly gapped?
Is the cylinder wall visibly scratched or damaged
finally,are the studs properly torqued 15 lb/ft?
Also no restrictions on the intake or exhaust?
try it with no exhaust and no intake manifold.
also try to hold your finger in the plug hole when cranking. Should be dam near impossible.
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Post by buford1488 on Sept 11, 2013 17:27:22 GMT -5
my money is on a leaky valve. although the oil thing raised it a lil. when you had the head off did you by any chance do the flash light trick?.........................................buford
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Post by endru on Sept 11, 2013 19:45:24 GMT -5
[replyingto=buford1488]buford1488[/replyingto]Good checklist sailracer. Valves are gapped, I checked the head for leaks before installing - used the flashlight and the gasoline tricks, no visible damage on the cylinder wall, neither the exhaust nor the intake manifold were installed, studs are torqued. BTW studs torqued - you know how there are 4 studs in a square and 2 off to the side that only hold down the cylinder and not the head? What's the proper tightening pattern for those 6 studs?
Now - when I plug the hole with my finger, yes it is totally impossible. But I can't tell the difference between 40psi impossible and 230psi impossible...
I did get my new cdi in the mail from tvnacman, so I'm going to hook that baby up and see if there's any improvement in the idle.
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Post by sailracer on Sept 11, 2013 19:59:52 GMT -5
sounds like everything is fine has to be a tester issue The two outside screws don't need to be torqued they should be the first two you tighten. Be careful, I've broken them in the past. don't overdo it.
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Post by tvnacman on Sept 11, 2013 20:26:21 GMT -5
I think he is out for a ride . I looking forward to his feedback .
John
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Post by endru on Sept 11, 2013 20:50:27 GMT -5
[replyingto=tvnacman]tvnacman[/replyingto]I'm back from my ride  Okay well not quite... BUT... John - I think your CDI may have fixed the problem! I started it up with the old CDI and it idled like crap. Put the new CDI on and it was like heaven. The A/F screw was extremely responsive and the idle screw did its job. Most importantly, there was no backfiring out the intake or skipping during idle. And all that with an  main jet (the stock exhaust is back on), which would have been unthinkable before! In my haste to get it back together just to test it out, I didn't put the shroud back on or get it street ready, so no test drive today. Plus there was a little smoke steaming off the cylinder area (not out of the breather tube), so that was a little odd... But hey, this is GREAT. The first positive result I've had in WEEKS. I'm crossing my fingers that I'll have time tomorrow after work to put it back together for real and take it for a cruise. John, if that CDI has done the trick I'm going to post rave reviews of it on the forum!  |
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Post by dude on Sept 11, 2013 21:34:52 GMT -5
What CDI did you use?
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Post by tvnacman on Sept 12, 2013 6:36:17 GMT -5
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Post by endru on Sept 14, 2013 15:16:26 GMT -5
I might have spoken too soon. I put the shroud back on, which of course included removing the intake and exhaust, then reinstalling them. When everything was put back together, it was back to its old self. I double checked the valve lash, swapped out the coil for my old one, adjusted the carb, but no luck.
I recorded a video of the problem. You can see about halfway through how it skips and sputters at idle. When I can manage to rev it up, it does just fine. What the video doesn't show is the smoke that came out the air intake shortly after I started trying to start it up. In between tries there would be just a little bit of vapor coming out the intake.
Sorry to get everyone's hopes up!
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Post by tvnacman on Sept 14, 2013 20:15:16 GMT -5
push up the throttle stop screw , let it warm up some before giving it gas .
John
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..BAD TO THE BONE..
jet
main jet (the stock exhaust is back on), which would have been unthinkable before!