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Old 06-15-2011, 01:34 PM   #1
trevorQQQQ
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Default compression

so i got it turning over with the pedal now when it turns over for about 3 mins its like it back fires out of the muffler like it builds compression and it blows by the rings
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Old 06-15-2011, 01:42 PM   #2
DOOmsman
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Default Re: compression

Do you have spark?
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Old 06-15-2011, 01:49 PM   #3
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Default Re: compression

yes
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Old 06-15-2011, 02:14 PM   #4
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Default Re: compression

Hey Trev,

It could be a number of things, though a compression test would be the best way to go.

The odd backfire out of the muffler could mean a few things:
- Is the engine getting enough fuel? If not, what you hear as a backfire could be a single fire once enough fuel has finally built up
- Have you taken the plug out? What does it look like? Dry or wet?
- Have you tried loosening the muffler and creating a gap between the cylinder and the muffler pipe? You could have too much backpressure in your muffler right now

Just a couple of ideas for you, but if it's not firing or only occasionaly firing and you do have spark, you've likely got a fuel issue (too much or too little), a compression issue, or a backpressure issue from the muffler
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Old 06-15-2011, 02:48 PM   #5
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Default Re: compression

im gonna take the carb in today and get it adjusted
-alright well i do have spark
-the plug is dry
-and i have not checked the compression
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Old 06-16-2011, 11:21 AM   #6
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Default Re: compression

Just a note Trev, there is really very little to adjust on the carb, other than ensuring the idle mix screw is correct (assuming someone hasn't changed the float settings).

First I'd take the carb off, and do a thorough inspection on it. Drop the bowl, and look for filth, or crusted filth. If you have this, clean the bowl thoroughly, and take out any crust or crud with a small wire cup (like a Dremel one). Rinse well with carb cleaner. Make sure the float is moving easily.

Next, try shooting carb cleaner through the bolt that holds the bowl in to check for blockages. You can also shoot carb cleaner up the post to the jets - should be some spray coming out of both ends of the carb. If not, you may need to clean the jets with a piece of wire to knock out crud. Spray again when complete.

It's also a good idea to close both the choke and throttle butterfly valves and make sure they do not have crud and varnish on them. Clean as needed.

If your oil injection is hooked up, recommend disconnecting it and going to premix. Replace the drip feed screw with a bolt that fits the hole. If someone has already taken the oil injection off, make sure there is a bolt in the hole to prevent allowing too much air in.

Finally once done, make sure you have thoroughly cleaned out and blown out the air intake hose. Crud from this hose can quickly redirty your squeaky clean carb.

If lack of fuel is the issue, you could be dealing with a lack of suction (crank seals), a damaged fuel pump, or a dirty carb. Let's get the carb cleaned first, and try a few other things if it's still not starting.
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Old 06-17-2011, 02:02 AM   #7
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Default Re: compression

So I found the problem, rings were bad, piston was damaged by dirt and crud; and the cylinder was grooved just a little bit, no good, no good! Thanks for all the help. Now I just need some performance help.
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Old 06-17-2011, 01:16 PM   #8
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Default Re: compression

Hey Trev,

If you want to go through all the sordid details of a rebuild, you can find my rebuild thread here:

http://www.buggiesgonewild.com/gas-e...s-rebuild.html

This will give you an idea if this is something you're up to doing.
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Old 06-18-2011, 10:52 PM   #9
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Default Re: compression

alright thank you now is there a secret way of putting the piston and rings back in the cylinder?? ive already broke one lol
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Old 06-19-2011, 08:12 AM   #10
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Default Re: compression

i turn the cylinder upside down and with piston and rings well oiled slip the piston down while squeezing the top ring. then the other one. just be sure you have the bevels up and the ring gap is over the locating pin in the piston land.wiggling it bit seems to help also. after this is done install one clip, being sure it is either up or down, not sideways. hold the cyl. and piston in one hand , lower over the rod and insert the pin and other clip. make sure your base gasket is on first.
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