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Old 28th May 2019
herostar herostar is offline
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Default Heads coming off - What else should I do? XB9R

Hello everyone!

I had two exhaust studs break off, one in each cylinder head, so I'm going to need to remove the heads to get the broken studs extracted/replaced at a machines shop.

My question for you all: What else should I be doing while the heads are off? I'm not looking to go deep porting/polishing or anything, but am curious if there are "normal" maintenance things I should take care of while everything is off the bike.

FYI this is for a 2003 XB9R

Thanks in advance for your help!
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  #2  
Old 28th May 2019
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I'd replace the base gaskets also
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Old 28th May 2019
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Any part of the studs sticking out from the heads? If yes, you might be able to remove them with a stud extractor.
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Old 28th May 2019
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Quote:
Originally Posted by ParrotHead View Post
I'd replace the base gaskets also
Probably not necessary especially if you dont disturb the cylinders. If you do it means means pulling at least 1 wrist pin clip per and the wrist pins. Leave the pistons in the cylinders or you're doing rings.
I'd try getting the broken studs out without removing the heads first.
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Old 28th May 2019
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Originally Posted by 60Gunner View Post
Probably not necessary especially if you dont disturb the cylinders. If you do it means means pulling at least 1 wrist pin clip per and the wrist pins. Leave the pistons in the cylinders or you're doing rings.
I'd try getting the broken studs out without removing the heads first.
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Old 28th May 2019
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Replace valve springs. Lap the valves see what seats look like.
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I'll definitely be replacing gaskets.

The studs broke off just under flush with the heads, so no option to try and remove them without removing the head (trust me, been sitting on this for 5 weeks trying to work a solution that didn't involve pulling the heads...).

What's the reasoning behind replacing the valve springs and lapping the valves?

Bike has ~12k miles on it.
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Old 28th May 2019
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Quote:
Originally Posted by herostar View Post
I'll definitely be replacing gaskets.

The studs broke off just under flush with the heads, so no option to try and remove them without removing the head (trust me, been sitting on this for 5 weeks trying to work a solution that didn't involve pulling the heads...).

What's the reasoning behind replacing the valve springs and lapping the valves?

Bike has ~12k miles on it.
You have good valve springs in those heads. He had weaker ones in his `99. I wouldn't mess with the valves either unless you're having an issue like leaky guide seals. In that case maybe test your springs since they're out anyway to do the seals. Lap the valves too since they're already out.
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Old 28th May 2019
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If you have equipment to check such things seat pressures, you find springs (exhaust) have weakened. Also lapping valves by hand can't hurt. Unfortunate you didn't leak down motor before disassembly.
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Old 28th May 2019
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Quote:
Originally Posted by 60Gunner View Post
You have good valve springs in those heads. He had weaker ones in his `99. I wouldn't mess with the valves either unless you're having an issue like leaky guide seals. In that case maybe test your springs since they're out anyway to do the seals. Lap the valves too since they're already out.
I don't know what shape my springs are in. Haven't opened the motor yet.
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