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Old 10-12-2022, 02:50 PM   #1
Paulzy123
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Default G9 Rebuild Time

Hello.

Engine is out.
Took it mostly apart, enough to measure and see the piston walls.
Piston wall looks smooth, a little oily, as expected as it burns oil.
Diameter measures at 2.887 inches. Thinking that seems like original?

Is there a convenient list of gaskets and oem numbers I can access to know what to order?

Assuming head, intake, carb, exhaust, crank front and back, also need the carb spacer.

Also any good videos or how too’s with torque specs..

Thanks for all the help this far.
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Old 10-12-2022, 04:23 PM   #2
CP241
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Default Re: G9 Rebuild Time

Download the service manual. It will give you all the info you need.

It also looks like you have/had a blown head gasket.

You will also want to measure the cylinder entire bore. These tend to get “bell” shaped towards the lower half so even with new rings it will still smoke and burn oil.
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Old 10-12-2022, 05:13 PM   #3
Paulzy123
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Default Re: G9 Rebuild Time

Quote:
Originally Posted by CP241 View Post
Download the service manual. It will give you all the info you need.

It also looks like you have/had a blown head gasket.

You will also want to measure the cylinder entire bore. These tend to get “bell” shaped towards the lower half so even with new rings it will still smoke and burn oil.
So if that's the case, would I simply do rings and hone out the cyclinder, or will it need to be machined?
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Old 10-12-2022, 05:26 PM   #4
CP241
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Default Re: G9 Rebuild Time

If it is indeed bell shaped you will need to have it bored out.

You’ll want to use a bore gauge to measure it and make sure it is both round as well as straight.

Cheap man’s method you can use a piston ring and feeler gauge and use the piston to push the ring down to various depths evenly and use feeler gauges to measure the ring end gap. It isn’t nearly as accurate but will give you a ballpark. If there’s more than a couple thou difference between the largest and tightest reading I’d have it machined.

Or take it to a machine shop and they’ll usually check it for a few bucks and have a much more accurate measurement.
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Old 10-12-2022, 05:26 PM   #5
raydhd
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Default Re: G9 Rebuild Time

While it is apart I would change the valve seal on the intake valve.
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Old 10-12-2022, 05:59 PM   #6
Paulzy123
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Default Re: G9 Rebuild Time

Thanks guys,

I like the idea of a machine shop measuring the bore, thanks for the idea.

I also do plan to tear it all down and replace all gaskets and seals.

I did get the Service manual, so I do have all the torque specs, unfortunately it does not mention any OEM part numbers for all the gaskets, seals, and Carb Spacer :( Any line on a good source for all those?

This is my first engine overhaul, I'm sure that's obvious...
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Old 10-12-2022, 06:11 PM   #7
CP241
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Default Re: G9 Rebuild Time

https://prestigegolfcars.com/yamaha-...parts-manuals/
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Old 10-12-2022, 06:47 PM   #8
Paulzy123
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Default Re: G9 Rebuild Time

Quote:
Originally Posted by CP241 View Post
Wow.
Thanks. What a great resource.
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Old 10-13-2022, 08:30 AM   #9
Paulzy123
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Default Re: G9 Rebuild Time

Just curious.
The bottom shaft for the clutch and fan has 2 seals.
Neither are leaking any fluids.
Am I best to bite the bullet and replace the 2 seals or leave well alone?
The fan is being stubborn coming off.
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Old 10-13-2022, 08:59 AM   #10
CP241
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Default Re: G9 Rebuild Time

If you are taking the motor apart, I would replace every seal and gasket you can find.

Note there is no valve stem seal on the exhaust valve, only the intake valve. It doesn’t hurt anything to put a seal on the exhaust valve.

Also once you look up the part numbers you can order the oem parts from partzilla
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