Replacement head - Should i replace studs? - Honda Rebel Forum
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post #1 of 7 Old 01-16-2020, 02:47 PM Thread Starter
 
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Replacement head - Should i replace studs?

I have a perfectly good gen 1 motor that runs great, but the PO tried to repair broken exhaust studs and messed up the head beyond repair. I purchased this one from Ebay. Should i replace the studs? I have new studs. Part of me is afraid that i might break one off when trying to remove it and the other part of me says if I don't replace them now, they may break due to age once the head is installed. At the moment, i have an 05 engine in the bike and it runs great... but i can hear some chain noise, maybe piston slap. Either way, i would like to put the original motor back in the bike. Thoughts?
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post #2 of 7 Old 01-16-2020, 04:44 PM
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I'd soak the studs with penetrating fluid twice a day for two days and rap (not beat!) the end of each stud once with a hammer after each application. Then place Vise Grips as close to the head as possible and alternate turning it slightly counter clockwise then clockwise, and repeat until it comes out. If it begins to bind, use more fluid, turn it in more and then continue alternating directions. Do it in baby steps and you will probably find they will all come out eventually. In tests, Liquid Wrench outperformed PB blaster. Kroil is an excellent penetrant.

A machine shop could fix the old head, but you might find the cost prohibitive.
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Keepin' all the left over parts. Gonna use 'em to build another bike!

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post #3 of 7 Old 01-16-2020, 07:10 PM Thread Starter
 
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Too late. All done. Now i'm doing a valve leak test.
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1987 Rebel 250
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post #4 of 7 Old 01-16-2020, 09:44 PM
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Glad you got it done with no problems.

Keepin' all the left over parts. Gonna use 'em to build another bike!

'01 & '09 Rebel 250, '06 Ninja 250, '89 VN 750
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post #5 of 7 Old 01-17-2020, 08:39 AM
 
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Quote:
Originally Posted by flitecontrol View Post
I'd soak the studs with penetrating fluid twice a day for two days and rap (not beat!) the end of each stud once with a hammer after each application. Then place Vise Grips as close to the head as possible and alternate turning it slightly counter clockwise then clockwise, and repeat until it comes out. If it begins to bind, use more fluid, turn it in more and then continue alternating directions. Do it in baby steps and you will probably find they will all come out eventually. In tests, Liquid Wrench outperformed PB blaster. Kroil is an excellent penetrant.

A machine shop could fix the old head, but you might find the cost prohibitive.



This is great advice for removing stuck bolts or studs.

2001 CMX250C Rebel
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post #6 of 7 Old 01-17-2020, 08:58 AM Thread Starter
 
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I got lucky with this head. In this case, they were not stuck at all. It was a 5 minute job for all 4 studs. Head will be installed this weekend on my gen 1 motor. Cheep and easy insurance since a 86 head could have really fatigued studs.

1987 Rebel 250
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post #7 of 7 Old 01-18-2020, 10:56 PM
 
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I know it's a moot point, but I'd just like to add to flitecontrol's advice above. Sometimes twisting and tapping with a hammer can loosen things up.

1974 CB125S (purchased 1983, ate 2 crankshafts, sold 1984)
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