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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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S3 Head doesn?t fit?
Hi there,
I recently bought a S3 Cylinder Head for my GasGas EC 300 2014. Yesterday I went to install it after I got my cylinder back from coating and honing and noticed that the inner component didn?t fit into my cylinder. Has anyone else had this problem or have I just gotten lucky with my purchase? The Stock head fits perfectly fine. |
#2
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Quote:
And secondly, are you sure that your bike is a 300? If you recently bought a secondhand bike, some previous owner might have converted it into a 250
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Anders "So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie) 2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper 2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper 1998 Bimota Supermono 1986 Duc Mille S2 1975 Guzzi sidecar hack 1961 Morini Corsaro 125 etc |
#3
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Double check you did not purchase a head for the 2021+ Gas Gas/KTM.
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#4
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Yeah, thats a good idea. Lately, I have seen a lot of stuff that is listed/labeled incorrectly.
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2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300 "If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut." ―Comedian Lewis Black "I think best when I have a wrench in my hands." Soichiro Honda "Dreams are messages from the deep." -Unknown Sardaukar |
#5
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Is it plain wrong or just tight? It is possible the cylinder is now a little tight and the head is a little big. Can you freeze the head and install it?
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#6
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Quote:
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#7
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I got the one for 00-2017 Model. It also has the right coolant mount.
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#8
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It?s just a bit tight. Freezing it might work but I don?t know If I would get it out again. Should just pop on like a normal head should shouldn?t it?
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#9
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Carefully tape over the mating surface on the underside of the head. Use something durable like duct tape. Take a small hand file and file all around the pilot nose on the cylinder head. Use care to keep the file parallel to the pilot nose and use continuous strokes and follow the curvature. If it's a really small amount of interference, this should work OK. You can clean the filings off and test fit the head as you go. You may only need to take it down a thousandth of an inch or so.
If you know someone with a metal lathe, they can chuck on a spark plug to spin the head. Careful dial indicator use and swapping around as they tighten the chuck should get it running perfectly true. Then it's just a matter of a very small cut (or it could filed down while in the lathe). I'd go with the first method as it's easier to check the fit as you go. The cylinder can be off center by a couple of thou and have no detrimantal effect on the engine. The only really important thing is to keep the mating surface of the head (and the oring grooves) in good shape.
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2011 EC250E |
#10
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I'd go lathe for square cut in corner then just test with barrel in situ.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
Tags |
cylinder, s3 head |
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