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New top end KTM 50. Piston hitiing the cylinder head.
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Godzilla
User
| Posts: 52
| Joined: 05/08
Posted: 10/03/08
12:37 PM
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I am putting a new top end on this KTM. When I tighten the cylinder head it hits the piston. It won't even crank when tightened. Any Ideas?
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92rm125
Addict
| Posts: 3828
| Joined: 03/08
Posted: 10/03/08
12:42 PM
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You sure you have the right piston?
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Godzilla
User
| Posts: 52
| Joined: 05/08
Posted: 10/03/08
01:01 PM
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Same numbers as the old one
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Godzilla
User
| Posts: 52
| Joined: 05/08
Posted: 10/03/08
01:57 PM
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Would it be ok to sand the top of the piston down some?
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chudster
Guru
| Posts: 886
| Joined: 09/08
Posted: 10/03/08
02:29 PM
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Is the head warped?
+++++++++++++++++++++
I love the Turtle Posse!
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Posted: 10/03/08
07:38 PM
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is the head warped? i wouldnt sand my piston. my piston doesnt like to be ground down by scratchy paper.
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Godzilla
User
| Posts: 52
| Joined: 05/08
Posted: 10/03/08
08:46 PM
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I pulled it off and checked the cylinder and head. It is not warped. WTH is going on?
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92rm125
Addict
| Posts: 3828
| Joined: 03/08
Posted: 10/04/08
12:27 AM
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Neither is warped?? Well you have stumped me...![]()
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Posted: 10/04/08
12:48 PM
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this would be just a guess. maybe you have a thinner head gasket???
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92rm125
Addict
| Posts: 3828
| Joined: 03/08
Posted: 10/06/08
12:13 PM
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Bump.
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atkkid250
Addict
| Posts: 2341
| Joined: 07/08
Posted: 10/06/08
12:14 PM
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get a new piston. it sounds like the piston is out of spec if everything else is fine. im guessing your not the original owner of the bike. so who ever had it before you probably got the wrong piston. you can get the bore right but if you get the stroke length wrong they'll send yo the wrong piston. ~pat
PEACE GUYS ITS BEEN A BLAST!!!!! ~patrick
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92rm125
Addict
| Posts: 3828
| Joined: 03/08
Posted: 10/06/08
12:22 PM
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Call up your a KTM dealer, and check if you have the right piston.
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toomey706
New User
| Posts: 22
| Joined: 10/08
Posted: 10/16/08
12:23 PM
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If you had the head milled or bought a wiseco pro-lite piston for example(raised crown) or both, that will happen. You mill the head to raise the compression ratio, and the pro-lite piston does that also, by raising the crown instead of lowering the head space. I found that out the hard way, never seen it on a 50 though.
Bill
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DLHamblin
Moderator
| Posts: 2548
| Joined: 03/05
Posted: 10/16/08
02:37 PM
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![]() Godzilla:
I am putting a new top end on this KTM. When I tighten the cylinder head it hits the piston. It won't even crank when tightened. Any Ideas?
Well, an obvious question is you do have the base gasket in place (and head gasket unless it uses o-ring head gaskets), correct? Beyond that I would double check the piston.
Dave H 2006 YZ250
(2008 YZ 125 son)
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