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Old 04-24-2012, 09:09 PM   #1 (permalink)
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Question 83 Honda 110 ATC engine repair questions

I'll just get right into it....

Got the ATC from my pops after it had been sitting in a garage for about 10 years. My uncle (his brother) in a drunken rage launched the thing into a reservoir thinking it was funny. I worked afterwards but it's had issues ever since then.

First thing I did was rebuild the carb. That's when I noticed it had a 71 Honda CT90 carb on it. Ordered the correct one from ebay and slapped it on. Still won't turn.

Then I checked the spark plug. The gap was set at .040 so I adjusted it to .025 and still won't turn. Sprayed carb cleaner in the hole, replaced spark plug and not even a pop!

Took the CDI unit apart and cleaned all the parts to be sure it was functioning properly. There was a lot of what looked like calcium but got it all cleaned out. Still won't turn.

Got a compression gauge and found out it has 0 psi now. It had compression before I started working on it so I ordered new gaskets for the pieces I worked on and a new spark plug just incase it was the wrong one.

Now... I tried to do a value adjustment but had no idea what I was doing and I think that may have messed with the compression.

I'm wondering if I should rebuild the cylinder head? Would this be a better way to adjust the valves? Any other ideas what the problem could be? I don't wanna rip this thing apart if I don't need to.

Thank you for your time and assistance.....
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Old 04-27-2012, 04:39 PM   #2 (permalink)
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Ok to adjust the valves, remove the recoil starter
Turn the generator rotor counterclockwise until the "T" mark aligns with the timing index mark on the stator.
Both the tappets should have a little play which is TDC (very little play will be felt because it is .003 " of play)
If you have no play in the tappets turn the rotor 360 degrees again and realign it up with the mark on the on the stator as before.
Use a .003 feeler gauge to set the valves. Try this first then go from there.
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Old 04-27-2012, 10:50 PM   #3 (permalink)
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Thanks Melatv.. I appreciate the time you took to respond and I'm sure that information will come in very handy.

Since I broke a couple gaskets messing with the CDI and lost all compression I decided to do a top end rebuild. When I took the head off, the intake valve had so much gunk around it that I don't think the fuel/air mixture was getting into the combustion chamber. It's the most logical reason I can think of given the circumstances but this isn't like the lawnmower engines I'm used to Please correct me if you think I'm mistaken.

The new gaskets should be hear tomorrow and I'm just about done cleaning the top end. I might need some assistance putting this thing back together but I can post pics if I get lost.
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