|
Gas Yamaha Gas Yamaha Golf Cars; G1 through "The Drive" and U-Max Utility Vehicles |
|
Thread Tools | Display Modes |
07-20-2008, 07:06 PM | #1 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
1990 G8 Engine Problems
My 1990 G8 is having some major engine problems. I was running just below the rev limiter on a paved surface and began to go up a hill about 100ft up the hill the engine just quit and would only put and ran really rough. I thought that if I let the engine turn off then restart it that it would run again. Well, I did that and the starter/generator could not crank the engine past TDC. On a fully charged battery it gets to TDC then the solenoid clicks.
I then pulled off the valve cover and found a pushrod, exhaust, had worked its way loose. I reinstalled it and got the lash about right. When I started it up it still ran really rough. So I pulled off the head. I found out that the piston is .25mm oversized. I have had this cart for 5 years and have been abusing it and the piston had no carbon at all on it. The valves looked good and only had carbon on them as did the spark plug. The valve springs seem to have sufficient pressure and the lifters look to be lifting. This cart has been backfiring for awhile now and last week when I turned it off after running it hard it dieseled, in reverse rotation, for almost one full minute. The backfiring has also broken every baffle loose in my muffler and blown out 2 quarter size pieces of the casing. Does anybody have an idea as to what this could be? I'm thinking now that it may infact be an ignition problem but am not sure. Here is a picture it now has 20x10-8 All Trails on the rear |
Today | |
Sponsored Links
__________________
This advertising will not be shown in this way to registered members. Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum |
|
07-20-2008, 08:51 PM | #2 |
Gone Wild
Join Date: Sep 2007
Location: maine
Posts: 3,352
|
Re: 1990 G8 Engine Problems
I'm going to say if it has been backfiring lately its because the vales were lose. that's why it turns back woulds when you shut it off worm like a car when the timing is off...
|
07-20-2008, 08:59 PM | #3 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
Re: 1990 G8 Engine Problems
I forgot to put in that it backfires when I get back on the gas which I assume is from the carb not closing all the way when I let off.
Edit-The engine also has massive blow-by. If i remove the oil fill cap and crank the engine the air coming out could turn a small fan. I believe the compression rings are almost shot but the oil ring is still good. Last time I did a compression check about 2 years ago I got somewhere between 120-130psi which I think is low. |
07-20-2008, 09:11 PM | #4 |
Gone Wild
Join Date: Sep 2007
Location: maine
Posts: 3,352
|
Re: 1990 G8 Engine Problems
have you took the muffler of and try turning it over with oil cap off?
|
07-20-2008, 09:16 PM | #5 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
Re: 1990 G8 Engine Problems
I have not done both of those at the same time but have done both of them before this problem occurred.
The muffler is like a maraca and the exhaust pipe is even blown out and will pull out of the muffler 3 inches. I have run the engine before this occurred with the filler cap off and it ran the same. The engine is very easy to turn over with the head off. |
07-21-2008, 02:56 PM | #6 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
Re: 1990 G8 Engine Problems
I am also curious if the factory put oversized pistons in the engines?
|
07-22-2008, 06:01 PM | #7 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
Re: 1990 G8 Engine Problems
Today I took the head off again and took out the valves. The valves are not bent neither are the push rods. The engine feels like it is getting decent compression and there is a nice blue spark from the spark plug. I swapped ignition modules with a known working one and it still has problems. The fuel filter is not clogged and the fuel pump pumps and the float floats. The carb is not clogged. I also disconnected the air filter from the carb and it backired like a jet through it.
Is there a way to adjust or retard the timing? I think that somehow the timing got thrown off and that is why it won't run. |
07-23-2008, 10:17 AM | #8 |
Golf Cart Photographer
Join Date: Jan 2007
Location: Wichita Falls Texas - My Ride 2010 Club Car
Posts: 6,236
|
Re: 1990 G8 Engine Problems
Welcome to the forum bordin34........................
|
07-26-2008, 03:06 PM | #9 |
Getting Wild
Join Date: Jul 2008
Posts: 105
|
Re: 1990 G8 Engine Problems
I just ordered a 16hp Powermax and a 780 clutch to replace this engine should be here in a week.
|
07-26-2008, 10:33 PM | #10 |
Gone Wild
Join Date: Sep 2007
Location: maine
Posts: 3,352
|
Re: 1990 G8 Engine Problems
there you solved that one post pics when you get done.
|
|
Thread Tools | |
Display Modes | |
|
Similar Threads | ||||
Thread | Forum | |||
B 1990 EZ-GO Cart | Gas EZGO | |||
Clutch or engine problems? | Gas Yamaha | |||
4stroke marathon engine problems | Gas EZGO | |||
My 1990 E-Z-GO | Members Rides |