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Post by Martin on Mar 18, 2023 13:55:14 GMT
Hi folks question about these channels which I believe you can fill in. 1. What’s their purpose if they can be just filled in? 2. What do you folks do with them? New head bolts with the rubber bungs? Fill them in, gasket sealant, JB Weld?  |
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Post by BritPete on Mar 18, 2023 14:02:36 GMT
I think a mix of what you have suggested
I have sourced a new set of bolts as I am about to do mine but 400 bolts are more readily available
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Post by Martin on Mar 18, 2023 14:20:14 GMT
I think a mix of what you have suggested I have sourced a new set of bolts as I am about to do mine but 400 bolts are more readily available Do you have to renew these rubber bung bolts each time or would the rubbers withstand a few time times on and off? |
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daveh
Full Member
Posts: 417
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Post by daveh on Mar 18, 2023 15:44:21 GMT
When I rebuild my 250 top end I just the original bolts with rubber. They work fine if you clean up bolts from any corrosion.
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ian
Member Of The Year 2019 
Isle of Man
Posts: 5,411 
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Post by ian on Mar 18, 2023 19:40:45 GMT
I managed to get new bolts for my 400NA, but for my 250NB I had the slots welded up - problem solved forever  |
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daveh
Full Member
Posts: 417
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Post by daveh on Mar 18, 2023 20:02:56 GMT
When I rebuild my 250 top end I just the original bolts with rubber. They work fine if you clean up bolts from any corrosion. Sorry for bad English! Wrote this on my mobile and didn't check it. Obviously meant to say 'rebuilt' and 'just used original bolts ' 😀 Also if rubber is ok, it does not have to do a big job, just block the channel. Was a strange design the Japanese made here. |
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Post by buster on Mar 19, 2023 9:55:33 GMT
I think the idea is to give an oil feed to the thread on the bolt to stop it corroding and seizing, it doesnt work, and if it did work then why on earth didnt they do the 2 at the other side?
personally I favour Ian's trick of getting them welded and just using normal bolts
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Post by roger7 on Mar 20, 2023 17:22:19 GMT
I used high temperature JB Weld 0n my 400 . No problems after 18 months
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Post by Martin on Mar 21, 2023 19:58:06 GMT
Thanks for the replies folks. I’m thinking clean up bolts and put on some new rubber or JB Weld.
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