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Backfiring
by: rcq92130 - Jan 9, 2015 0:22:42 GMT -5
Post by rcq92130 on Jan 9, 2015 0:22:42 GMT -5
Sorry to say you CANNOT reuse the head gasket. At all.
Once the head has been torqued down that gasket is used. You can't untorque and the retorque, let alone open the engine up and reuse it.
And remember - you HAVE TO ream out the liner to get the new set of rings to seat (and not give you the same oil burning, low compression problem). Small reamers (that attach to a drill) are about $10.
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Post by lain on Jan 9, 2015 1:00:01 GMT -5
If u happen to rip a gasket uncan use gasket maker to help seal it up . many do this with no problems. Even if the gaskets turnout to be OK u can put a thin coat of gasket sealer / maker around the gasket to help it seal just to be safe . or if u can get some gasket paper u can trace the old one and cut out a new gasket to use. Sorry to say you CANNOT reuse the head gasket. At all. Once the head has been torqued down that gasket is used. You can't untorque and the retorque, let alone open the engine up and reuse it. And remember - you HAVE TO ream out the liner to get the new set of rings to seat (and not give you the same oil burning, low compression problem). Small reamers (that attach to a drill) are about $10. So I can only use gasket maker on the cardboard gaskets, not the head gasket? Do they have reamers for dremels? I don't have a drill. What do they look like? |
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Post by geh3333 on Jan 9, 2015 1:07:01 GMT -5
If u happen to rip a gasket uncan use gasket maker to help seal it up . many do this with no problems. Even if the gaskets turnout to be OK u can put a thin coat of gasket sealer / maker around the gasket to help it seal just to be safe . or if u can get some gasket paper u can trace the old one and cut out a new gasket to use. Sorry to say you CANNOT reuse the head gasket. At all. Once the head has been torqued down that gasket is used. You can't untorque and the retorque, let alone open the engine up and reuse it. And remember - you HAVE TO ream out the liner to get the new set of rings to seat (and not give you the same oil burning, low compression problem). Small reamers (that attach to a drill) are about $10. So I can only use gasket maker on the cardboard gaskets, not the head gasket? If u use a good gasket sealer I don't see why it wouldn't work , yes the gasket was already torqued but a good sealer over the gasket should do the job . or u can be safe and just make a new gasket with a sheet of gasket paper and also use some sealer or maker . |
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Post by geh3333 on Jan 9, 2015 1:11:47 GMT -5
Honestly I've untorqued the cylinder nuts and replaced a rocker assembly before and retorqued with no problem  . Lol |
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Post by lain on Jan 9, 2015 1:14:57 GMT -5
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Post by geh3333 on Jan 9, 2015 1:26:32 GMT -5
U can double the thin gasket up and that will make it thicker.
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Post by geh3333 on Jan 9, 2015 1:30:02 GMT -5
I like the rtv red gasket maker , its also rated to a higher temp
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Post by lain on Jan 9, 2015 1:39:16 GMT -5
I like the rtv red gasket maker , its also rated to a higher temp I'll pick some up in the morning. I feel like the head gasket might be at least part of the issue, because last time I opened it up I didn't even clean up the scraps of black gasket that had tore off when I cracked it open. I'm also not sure but I think there are tiny scraps of the black gasket on my spark plugs. Ontop of that the problem of the random popping wasn't a problem until after I cracked open the whole thing a few days after I first installed the BBK. Back then it was very rare but did happen, now it's constant, and I've changed the head, replaced a large portion of the components of the scoot, just not the gaskets. |
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Backfiring
by: rcq92130 - Jan 9, 2015 1:46:02 GMT -5
Post by rcq92130 on Jan 9, 2015 1:46:02 GMT -5
geh. I think you and lian are speaking about 2 different things. You can use silicone sealer with the paper gasket at the base of the jug, but you should never use any kind of sealant with the head gasket. And - once it's compressed you should not re-use it. Here is a hone at harbor freight for $24. No can do with a dremmel  The stones spin around (thanks to the drill) and de-glaze the walls of the cylinder. It leaves tiny "scratches" in the wall of the cylinder that help bed in the new rings. You should spin the hone slowely and move it up and down, so that when you are done you have a criss cross pattern of "scratches" all up and down the cylinder walls. |
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Backfiring
by: rcq92130 - Jan 9, 2015 1:49:26 GMT -5
Post by rcq92130 on Jan 9, 2015 1:49:26 GMT -5
If you can't afford a drill (the photo I showed you is for an auto cylinder and is too big for our tiny scooter engines), here is a thought
Take your jug to any lawnmower repair shop and ask them if they would, as a favor, deglaze the thing. I'm betting the guy will do it for you - only takes a few minutes.
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Post by tvnacman on Jan 9, 2015 5:22:20 GMT -5
Guys I'm with rcq92130 (cute avatar) , you had some problems with this engine , I bet you squeezed the head gasket several times .I would at this point like to clear the job , don't let a $5 gasket hang the job . As for the hone tool I got mine from harbor freight , I got a brake hone . They are smaller and fit in the jug , I checked at the time if the material that contacts the cylinder walls were the same for both the larger cylinder hone and brake hone and they were . John |
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Backfiring
by: jerseyboy - Jan 9, 2015 7:20:19 GMT -5
Post by jerseyboy on Jan 9, 2015 7:20:19 GMT -5
For the $$ you are going to spend on the gasket maker you could buy a complete gasket kit for a few more bucks..I wouldn't mess around with the head gasket,,so much compression and blast going on up there.Im sure it would be fine as I reused them on mower's/briggs and stratton,,but these GY6's have alot more compression upstairs. No,,a dremel is not a suitable tool for honing,,I would do it by hand before attempting that..lol Also make sure to read up on HOW TO HONE before running a hone into your bore,,there is a proper way to cross hair the bore.. Hey TVNACMAN,, Thanks for the honing tool idea,,might run up to HF today and take a gander. I will grab a Wendy's combo of coarse since its next door  Tom |
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Post by lain on Jan 9, 2015 11:59:28 GMT -5
Ended up getting a friend to spot me the money to get new gasket set. I will be working on the rings when I replace the gaskets. Anythign else I should take a look at when I'm in there?
The guy who I buy all my parts from on ebay says there's no reason to hone the cylinder because it is not glazed nor have I put much miles on it. I pretty much broke in the 100cc at about 50 miles or so and started having issues and stopped using it often, I rode it maybe once or twice a week about 1 mile each way since I broke it in. Should I trust this to be good or should I hone it anyways?
What cheap methods are there to honing? I do not know anyone with a drill, the only drill like tools I have are air driven impact wrench and an electric dremel. The guy I buy parts from says they have used 600 coarse sandpaper with racing engines, wouldn't that also work on my scooter engine?
I want to get the honing stuff just in case I need it again but I just plain don't have the money. I spent all of my gift cards on the parts I had ordered over the past few weeks and I am literally sitting here with a jar of pennies and nickels that amount to around $5...
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Backfiring
by: rcq92130 - Jan 9, 2015 13:02:23 GMT -5
Post by rcq92130 on Jan 9, 2015 13:02:23 GMT -5
I would not even think about NOT honing. Just a silly risk.
But I get the money problem. Here is a not morally great possible solution
Go to Harbor Freight, get what you need. Use it and return the drill (which will have about 2 minutes of use under it's belt; as close to unused as a thing can be). You might or might not be able to also return the hone, but those are sooo cheap (especially the little ones made for brakes, which were suggested (by geh?) and are perfect for a 50cc scoot.
Or just go to a lawnmower repair shop and ask for a favor. Strongly suggest you NOT use sandpaper. Maybe --- MAYBE --- someone who has done this 1,000 times could do this reasonably, but a first timer??? Silly risk.
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Post by lain on Jan 9, 2015 13:21:03 GMT -5
Just wondering, why wouldn't a dremel work? It spins really fast and has adjustable speeds. What is the difference between a drill and a dremel? I've used my dremel to drill holes for screws and cut plastic.
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