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#110222 12/01/21 08:10 PM
Joined: Jan 2016
Posts: 7,466
Likes: 143
NormK Offline OP
SENIOR TECHNICIAN
A mate gave me a GMC generator a couple of days ago and the problem was quickly obvious, somebody had been fiddling with the carby. Tell tale was the end of the governor arm and spring had been bent so the carby could be removed. It fired up and ran well, probably a bit rich which was obvious by the smoke, but it was generating well and ran my drill on high speed no problems. The issue is the float needle not sealing. It is a steel tip and it looks like a brass seat in the carb. I would expect it to have a viton seat and I'm not sure if this has been removed. I have tried a couple of viton tipped needles but it still won't seal. I doubt it is worth hunting a carb for it so it will probably end up going to the scrap unless somebody has any suggestions. Being GMC it is probably not worth wasting any more time on it.

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NormK #110223 12/01/21 08:23 PM
Joined: Jan 2017
Posts: 349
Likes: 4
Apprentice level 4
I think GMC might be a little underrated. I have a few of there items and the have always given good service but most of them have been dumped now.

I guess nobody will be willing to pay a decent price for that generator but if you needed one for your own use. I think they were about 850 W so quite useful


2 stroke aren't they ?

Jeff

NormK #110224 12/01/21 08:30 PM
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NormK Offline OP
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Yes Jeff they are a 2 stroke pity it runs well and easy to start. I have ratted a number of carbs here and tried several viton tipped one but no joy so far

NormK #110226 12/01/21 10:53 PM
Joined: Jul 2018
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Hi Norm

Haven't dealt with 4 stroke GMC like your one, but my 2 stroke 850w has a viton tip needle

Being a fairly generic OHV chonda you would think the needles would be similar

I have also got decent mileage out of GMC - as has a friend with a GMC half crank trimmer (weedeater featherlite engine) who has used it 15 years now and it only got its first service in 2018 (along with an ignition coil and starter repair shortly after (ie - would have been uneconomical to repair)

NormK #110228 13/01/21 06:06 AM
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NormK Offline OP
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Hi Tyler,
it is a 2 stroke one, I did have a number of Briggs seats here but I can't find them, hope I didn't throw them out.

NormK #110238 13/01/21 12:03 PM
Joined: Jul 2018
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Norm, I am pretty sure 4 stroke as it has a dipstick and says use 4 stroke.

They were one model up from the 2 stroke 650 and 850w back when they sold them

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NormK #110239 13/01/21 12:33 PM
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NormK Offline OP
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Hi Tyler,
you are right, it was only when Max was here and we were looking at it and I saw the 4 stroke on the pullstart, shows how closely I looked at it. I have had a couple of them here before and they were 2 strokes so I just assumed the same. Now maybe it is worth trying to fix the float needle problem.

NormK #110241 13/01/21 01:45 PM
Joined: Jul 2018
Posts: 2,086
Likes: 80
SENIOR TECHNICIAN
Hi Norm

Have you tried any of the Chonda needles?

They still sell carbys on ebay, though only from bloody china https://www.ebay.com.au/itm/Carbure...-4-stroke-Petrol-Generator/232822780524?

NormK #110244 13/01/21 04:24 PM
Joined: Sep 2015
Posts: 2,044
Likes: 145
SENIOR TECHNICIAN & HISTORIAN
G'day Norm ,Jeff and Tyler

The carby seat can be polished to stop them leaking ,I've heard people using valve grinding past or
metal polish.





Cheers
Max.

NormK #110245 13/01/21 04:29 PM
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NormK Offline OP
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Hi Tyler,
I certainly wouldn't pay $30 for a carby for one, just not worth it, I will give Maxs idea a go still think it either needs a viton seat or a viton tipped needle

NormK #110246 13/01/21 05:14 PM
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NormK Offline OP
SENIOR TECHNICIAN
Hi Tyler,
I certainly wouldn't pay $30 for a carby for one, just not worth it, I will give Maxs idea a go still think it either needs a viton seat or a viton tipped needle

NormK #110248 13/01/21 06:00 PM
Joined: Jul 2018
Posts: 2,086
Likes: 80
SENIOR TECHNICIAN
The only way a $30 carby would be viable if you were keeping it for your own use

Im sure you will manage to cobble something together


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