Hey y'all, I have a mega moto 80 frame with a Tillotson 212 electric start that has a billet connecting rod, no governor and Mod2 Cam. I was coming back from the gas station and speeding a little bit which causes some vibration with the bike, when all of a sudden the bike started sputtering, so I eventually just shut it off a couple seconds after it started sputtering to check it out. Look over and see one of my two carburetor bolts were gone, my carburetor was hanging down and my gasket was gone. At the time I assumed the gasket and carburetor bolt were gone so I attempted to use zip ties to put everything back together to make it the last leg to my house and repeatedly kept trying to start the bike till I eventually gave up and just pushed it back home. Got back home and started taking things apart as it still wouldn't start, I eventually took off my exhaust and saw the carburetor gasket looped around the exhaust valve. Not really sure what to do here, but I'm assuming the engine is junk?
Mikuni 22mm carburetor gasket got sucked into combustion chamber
- Thread starter Hyde
- Start date
Tore it down and got some of these pictures. The exhaust valve has a little bit of scarring so I assume I should just get a new one or could I get some valve grinding compound to re-seal it? Everything on the head and cylinder walls looks fine in my eyes but not too knowledgeable with that stuff
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I don’t understand why you would tear down an engine that far for a gasket getting sucked into the intake. I was taught to do the least amount of tear down required to fix the problem. The odds of a carb bolt getting sucked in is astronomical I would think. The bolt would drop to the pavement before it turned into the kennedy magic bullet. Maybe I’m missing something but I’m seeing an over reaction or some of the pictures are from the billet rod installation???
I'm rubbin the sore spot in my head were my brain used to be. HOW does a gasket get sucked into a motor and you keep trying to start it? Come on that is like driving a car on a flat and blaming California air for the rim damage in Cincinnati Ohio. It should be painfully in your face you had a full on failure.
If I'm missing something fix me
If I'm missing something fix me
Not to knowledgeable with identifying how healthy or unhealthy cylinder walls should look, and how healthy or unhealthy valves and porting should look as I said "Everything on the head and cylinder walls looks fine in my eyes but not too knowledgeable with that stuff" not the entire engine. I'm sorry I should've re-worded it to say "but I'm not too knowledgeable surrounding those things and how they should look" so it could've helped you out. I'm not sure how the cylinder walls are suppose to look as this is my first engine build that's why I said IN MY EYES, but that's why I reached out and was asking. The only thing I know about valves is that you should lap them to get a good seal otherwise I don't know what else makes the valve work properly except the springs and retainers as the valves and springs are stock as I've never touched them until today and had to watch a video so I could learn how to take it apart. I reached out to multiple people freaking out about the top ring on the cylinder walls assuming the gasket entering the combustion chamber had something to do with that thinking that it somehow could've gotten shaved down and would be uneven as that's why I assumed the block could have been junk(I have a half brain cell remaining in my brain for thinking that, as the gasket is only rubber). I dissembled the rod because when I was draining my oil I noticed more metal particles coming out than prior oil changes, and wanted to check my rod bearings. Took out the valves because the gasket was looped around the exhaust valves and wanted to see if it had done any damage. And not sure how the 11th comment was necessary but, ok?
Took everything apart as I saw more metal particles when draining my oil than in prior oil changes and also check rod bearings. Took out the piston because I had barely any compression after I turned the bike off, and even though there was a small amount of oil under the head gasket I just wanted to check my ring gap. Also so I could get a better look at the cylinder walls to try and comprehend what I was looking at. The bolt didn't get sucked in, just flew away probably. Only the gasket got sucked in. And my apologies for including the pictures of the crankshaft and camshaft as I saw those weird colors on them and forgot to ask what they are on that post.
The gasket got sucked into the motor because one of the two carburetor bolts became loose and eventually fell off with the nut. That resulted in the carburetor hanging down and since the engine was still running and sucking in fuel and air, it also vacuumed in the gasket. As I said, when I stopped the engine, I assumed the gasket had also just fallen out with the bolt and nut and were just somewhere on the road and didn't realize it was in the combustion chamber until I took the exhaust off, at home.
Hyde you have no reason to apologize. People approach problems differently. The gasket being sucked in prevents the proper valve sealing which would result in your loss of compression. My thought process would be to remove the foreign matter and then check compression to determine engine health. Your post didn’t mention the bolt and my reply made light of another members post.
Anyway I just thought you did open heart surgery for a stubbed toe.
Anyway I just thought you did open heart surgery for a stubbed toe.
This reminds me of late model racing one Friday night we was just going over everything nut bolt wise had the air box off and a red shop rag covering the carb well somebody didn't check and reached in and fired it up the whole shop rag went through the motor and in a million pieces on the floor
Got 2nd 20 hours later ran the motor another 10 races no problem
Got 2nd 20 hours later ran the motor another 10 races no problem