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Post by Fox on Jul 23, 2012 15:49:41 GMT -5
Tear it apart first. Better safe than sorry. You may find that it's just a bad head gasket or something else. Maybe a warped head.
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Post by pmccolley on Jul 30, 2012 1:08:24 GMT -5
Ok got it torn down. It actually appears ok. Can still see a little of the original hone. There is a little carbon buildup on the top of the piston but everything else is clean. The gaskets are all intact. I measured the wrist pin at 12mm. And took a couple other measurements as well.
Piston Ring End Gap : .015 or .381mm Cylinder Bore : 1.574 or 39.99mm Piston Center : 1.569 or 39.85mm Piston Above Rings : 1.566 or 39.78
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Post by pmccolley on Jul 30, 2012 10:44:06 GMT -5
I have a question that I cannot seem to find a clear answer for. I stripped down everything on the motor to get the head off. I was looking at the muffler last night and somehow cam to the conclusion that I should blow in it (don't remember why, too many beers?) but I think it may be clogged. I cannot blow any air through it at all. Should it allow air to free flow? Is there some kind of baffle, packing or catalytic converter that would not let me blow though it?
If it is clogged would that screw with my compression readings?
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Post by 90GTVert on Jul 30, 2012 11:43:52 GMT -5
You should be able to feel air on the other end. My stock pipe is baffled and I think has some form of converter built in and I can easily feel air on the other end without blowing all that hard. I didn't even need the beers to try this. lol
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Post by pmccolley on Jul 30, 2012 13:06:27 GMT -5
OK I cannot blow any air at all through it. There is no way to open it up without cutting. Here is what it looks like Can I try to burn it out? It was suggested by my neighbor to dump some unleaded into and let is soak then rinse and repeat a couple times. Then mix up to oil and gas at 50:1 and put about a cup inside and set it on fire and let it burn it self out. Is this a good idea\bad idea? Looking at the outlet its definatly got something in there I cant tell if its just spider crap or what but no air at all passes from either end.
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Post by 90GTVert on Jul 30, 2012 13:30:21 GMT -5
Plugging one end and filling it with caustic soda to sit overnight or throwing it in a fire are the two methods I commonly hear. That or is bold to be sure no one fills their pipe with chemicals and then throws it in a fire. lol No personal experience with either. Obviously remove the chome before burning it and you'd need to repaint it when it's done. Rustoleum's BBQ black works well for a flat finish and it dries super fast.
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Post by pmccolley on Jul 30, 2012 23:13:27 GMT -5
A strong blast of air opened up the exhaust pipe. I re assembled everything and a quick blast of ether and it fired right up, if I play with the throttle it will run but if I leave it alone it dies.
I am heading out of town later this week so I will try to do another compression test before then. I also ordered a set of rings to see if that will up the compression sine the sleeve and piston look good.
Any suggestions on the next step to keep this thing running?
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Post by 90GTVert on Jul 31, 2012 6:27:56 GMT -5
Does it run beyond idle now? If so, readjust the idle speed and mixture settings. There's always a possibility of a bad compression test reading. I know with my Actron gauge I only had 90ish psi on an engine where a Snap-On gauge showed over 150psi.
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Post by pmccolley on Jul 31, 2012 11:07:07 GMT -5
I can give it a small shot of ether and it will fire up, I can rev the engine to about half before it bogs down and then starts to die. Almost think its not getting fuel now as another shot of ether and it starts again. I guess I should pull the carb and try a deep cleaning make sure there is nothing clogged. I did notice the enricher is missing a screw so I can tell if its getting a good seal. That may be causing some issues as well. The fun part will be trying to find the right screw to replace it.
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Post by 90GTVert on Jul 31, 2012 13:00:40 GMT -5
That does sound like fuel. Do the carb cleaning and take a look at the float height. If it's a vacuum operated petcock, kick it over and see if fuel comes out of the hose to the carb. If you pull the carb off and keep it level, you'll know there's a problem if there's no fuel in the bowl or you can use the float bowl drain and see if anything comes out before removing it.
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Post by tygertung on Jul 31, 2012 13:32:55 GMT -5
I wouldn't recomend burning it out, I had a bad experience with this myself, the muffler guts melted.
The caustic soda method works well, just plug the tailpipe up with a potato, and fill it up with a strong caustic soda solution, let it sit overnight or so, then wash it out with a hose. What you can do is have the hose running through it and keep hitting it with a rubber mallet until the carbon 'cornflakes' stop coming out. I had to do this on my dads scooter for about half an hour.
It probably still is somewhat blocked that's why it still isn't running too well, as well as the carburettor must be cleaned out also.
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Post by pmccolley on Jul 31, 2012 13:40:06 GMT -5
I did decide to avoid burning it out. I would rather stick with something a bit safer with my kiddos around. I tried to upload photos to photobucket and its not working the photos are there for a while then gone and come back. I will try to move them to picasa and post again later.
The fuel tank runs to a mesh type filter then into the vacuum operated petcock which is working. The fuel then runs to a small stone type filter and into the carb. (this is the factory setup) I have opened the drain on the bowl and drained out fuel. I am thinking that with the sitting perhaps the jet is gunked up. When I had the bowl off last week to clean it out I only gave it a quick rinse with carb cleaner.
Its been hard I only get 10-15 mins a day to work on this.
But again I really appreciate everyones input and patience helping me on this project.
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Post by pmccolley on Aug 10, 2012 17:27:26 GMT -5
Made some progress, tore down the carb and the main jet was clean and clear but the pilot jet was clogged. Cleaned it up and now the engine starts right up. Downside is that while the carb was sitting one of the enricher screws appears to have run off so I now need to try and find a new one.
So a combination of gunked up carb and plugged exhaust would not let the engine start. I have not had time or the tools to retest the compression. I did order a set of rings but have not installed them since it only has 1600 miles on it, everything looked great in the cylinder and its running. I need to adjust the carb, change out the rest of the fluids and put it back together then it will be ready for a test ride.
Anyone have any other advice on things I should do to the scooter while its torn down?
Can you pressure wash the engine? There is quite a bit of grime built up. I was thinking about a quick wash before I do the fluids.
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