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04-26-2018, 08:36 PM | #1 |
Not Yet Wild
Join Date: Feb 2015
Location: Paddock Lake, Wi
Posts: 27
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Piston hitting spark plug 91 GTX 800
Need some help. I just picked up a 1991 EZGO utility cart and I don’t know much about this motor. Serial# is A22641.
It does run barely, but when it turns over it has a loud clicking noise. I take the plug out and it goes away. The piston is definitely tapping the plug. Anyone had this issue before? It has good compression still. Please confirm what spark plug should go in this. And also if it comes pre gapped or if I need to gap it. |
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04-27-2018, 08:38 AM | #2 |
Gone Wild
Join Date: Feb 2008
Location: Brooklyn, Michigan "Home of M.I.S."
Posts: 3,666
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Re: Piston hitting spark plug 91 GTX 800
2 cylinder = NGK BP4ES
1 cylinder = NGK BP4HS .030 plug gap Is the piston closing the gap when it hits the plug? and what is "It does run barely" ? |
04-27-2018, 09:17 AM | #3 | |
Not Yet Wild
Join Date: Feb 2015
Location: Paddock Lake, Wi
Posts: 27
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Re: Piston hitting spark plug 91 GTX 800
Quote:
Can you please explain what you mean by closing the gap? It is very slow to start, but eventually will run. Plug is usually wet. Smokes pretty bad and smells like gas pretty bad, so I'm thinking fuel is getting into the crankcase from a bad fuel pump diaphragm. Changing that this weekend. |
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04-27-2018, 09:23 AM | #4 |
Gone Wild
Join Date: Feb 2008
Location: Brooklyn, Michigan "Home of M.I.S."
Posts: 3,666
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Re: Piston hitting spark plug 91 GTX 800
If the piston is hitting the plug it would close the gap on the plug, if not something else is going on.
and all NGK BP4HS have the same reach, also do you have a fresh gas/oil mix? |
04-27-2018, 10:04 AM | #5 | |
Not Yet Wild
Join Date: Feb 2015
Location: Paddock Lake, Wi
Posts: 27
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Re: Piston hitting spark plug 91 GTX 800
Quote:
The oil injection is still present on this, which I've never been a fan of. Thinking of doing away with that and mixing manually. I've read 128 to 1 ratio for these is recommended. Can you also advise what motor this is? CC's, name, etc. Thanks for your help. |
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04-27-2018, 10:38 AM | #6 |
Gone Wild
Join Date: Feb 2008
Location: Brooklyn, Michigan "Home of M.I.S."
Posts: 3,666
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Re: Piston hitting spark plug 91 GTX 800
I don't think the piston is hitting the plug or you would see evidence of it on the plug, maybe something else. I'm not familiar with the 2 cycle models but someone hear can identify you motor.
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04-27-2018, 08:10 PM | #7 |
Test before replacing
Join Date: Aug 2013
Location: Ohio side of the Pennsylvania border.
Posts: 3,491
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Re: Piston hitting spark plug 91 GTX 800
If it is a 91, it's a 3-pg 9hp 2 stroke. The clutches should be mounted with the belt going front to back instead of side to side.
The spark plug is on top too. We know it's not the valves hitting. I kind of doubt it's the plug, but have no idea what is making the noise. |
05-01-2018, 08:36 PM | #8 |
Not Yet Wild
Join Date: Feb 2015
Location: Paddock Lake, Wi
Posts: 27
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Re: Piston hitting spark plug 91 GTX 800
Ok after doing some investigations, the clanking noise is not the piston hitting the spark plug. The noise does go away once it gets going faster and/or at top speed. From what Ive found online it could be the clutch.
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05-02-2018, 09:57 AM | #9 |
Gone Wild
Join Date: Feb 2017
Location: Richmond, TX
Posts: 1,026
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Re: Piston hitting spark plug 91 GTX 800
Could be a rod bearing that is starting to fail due to excessive wear.
It would get quieter as things heat up and oil pressure increases. Lets hope it's a clutch issue instead. |
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