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RMZ 450 2009 Cylinder Head thread rounded! HELP PLEASE

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Hi guys, I've got a 2009 RMZ 450 and I'm in love with this bike.

Had this bike for a while now and was kept well maintained but decided it was time to do piston and rings just for good measure. As per usual, after replacing the piston and rings the bike would need shimming and timing so I took it to a friend of mine who has done this countless amount of times on all our friends bikes (this is were I f*cked up, should of took it to the shop but there wasn't ever and issue before on any of the bikes he had done before and he actually works for a specialist motocross mechanics so I didnt know the wiser). After a while of him having the bike, I got a call to come round as there was an issue, when we go to tighten the cylinder head bolts, a few of the bolts 3 or 4 of them go to tighten and then they become loose indicating to me that they've heads threads have been rounded from where he was shimming. Everything else is perfect except them so I don't really want to spend £400/500 on an new Cylinder head plus I'm at university so finances are tight! Is there an alternative to this issue like re-threading and getting bolts slightly bigger etc

Sorry if this sounds nooby but I've never come across this issue before so I am kinda lost

 

Thank you in advance my bros and brolets!

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6 hours ago, kutenda said:

Hi guys, I've got a 2009 RMZ 450 and I'm in love with this bike.

Had this bike for a while now and was kept well maintained but decided it was time to do piston and rings just for good measure. As per usual, after replacing the piston and rings the bike would need shimming and timing so I took it to a friend of mine who has done this countless amount of times on all our friends bikes (this is were I f*cked up, should of took it to the shop but there wasn't ever and issue before on any of the bikes he had done before and he actually works for a specialist motocross mechanics so I didnt know the wiser). After a while of him having the bike, I got a call to come round as there was an issue, when we go to tighten the cylinder head bolts, a few of the bolts 3 or 4 of them go to tighten and then they become loose indicating to me that they've heads threads have been rounded from where he was shimming. Everything else is perfect except them so I don't really want to spend £400/500 on an new Cylinder head plus I'm at university so finances are tight! Is there an alternative to this issue like re-threading and getting bolts slightly bigger etc

Sorry if this sounds nooby but I've never come across this issue before so I am kinda lost

 

Thank you in advance my bros and brolets!

Just to be correct it is in the Cylinder head correct?

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1 hour ago, ar2stroke said:

Just to be correct it is in the Cylinder head correct?

Hi yes it’s the cam retainer bolts

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2 minutes ago, kutenda said:

Hi yes it’s the cam retainer bolts

The only thing I could think of is a time sert, however it requires a lot of skill to put them in correctly. Other than that you may look for a used head (gamble at best).

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Use  a helicoil kit and repair each one. It will take some time, you have to drill, etc,,  but you can find kits for less than 50$. Helicoil allows you to use the same size bolt as the original, and since the torque spec on the cams is not very high, it should work.

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13 minutes ago, joyhnye75 said:

Use  a helicoil kit and repair each one. It will take some time, you have to drill, etc,,  but you can find kits for less than 50$. Helicoil allows you to use the same size bolt as the original, and since the torque spec on the cams is not very high, it should work.

Thank you so much bro!!

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Helicoil. But do get a skilled hand tondo it for you. I'm surprised this mechanic friend doesn't know about them??

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