82 Honda CB900C chop/racer

[The Jimbonaut]

Can't tell for sure, but the tensioner bolt for your bike looks pretty similar to mine.  I repaired the threads in the engine housing with a 8mm TimeSert, with a 1.25 thread pitch if I remember correctly.  Once I'd repaired the threads the bolt snugged right in, good as new.

There's a guy not far from me (I'm in Montreal) that restores old 70's and 80's Japanese bikes and he has a ton of parts for sale.  I go see him from time to time - if you can get me the specs for the  bolt you need I can see if he has one.  You'll need to repair the threads I guess in your engine housing (go Timesert - apparently Helicoils can back out over time) but once you do you'll be golden.  You'll also need a small rubber plug for the hole just below the bolt - you should be able to pick one of these up from your nearest Honda dealer as they're still available.

[The Jimbonaut]

Here's what my tensioner bolt looks like -



(the groove around the bolt stem is for an oil ring to prevent oil leaks)

[djmaynard]

(go Timesert - apparently Helicoils can back out over time)

Sorry, what is timesert? I have a bolt similar to your but no rubber o-ring. I would have to get one of those. I would rather have something that was made for Honda engines than what I have.
Did you need a part number that is tried or how would I get specs?


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[bikeboy]

There should be a recess in the flange of that nut that will hold a beveled o-ring to seal it against the block. A normal o-ring won't seal properly, it has to be the original Honda part. Readily available (#91313-393-003)

[88SS]

I've got one broken off in my cb750. Can't get it out for shit, but it not moving at all. I've been riding with it. It definitely gets an oil drip tho.


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[djmaynard]

There should be a recess in the flange of that nut that will hold a beveled o-ring to seal it against the block. A normal o-ring won't seal properly, it has to be the original Honda part. Readily available (#91313-393-003)

Thanks man, I'll have to check which bolts I've tried but the insert on the engine was slightly tampered with and had some JB Weld on it. Thanks for the part number though. I tried eBay and Amazon for 91313-393-003 and I only came up with 91213-393-003? 

Anyone have one with the bolt included?

Bueller? Bueller?


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[djmaynard]

I've got one broken off in my cb750. Can't get it out for shit, but it not moving at all. I've been riding with it. It definitely gets an oil drip tho.


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Plenty of oil on the belly of my beast. Been searching for it for awhile.


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[bikeboy]

Thanks man, I'll have to check which bolts I've tried but the insert on the engine was slightly tampered with and had some JB Weld on it. Thanks for the part number though. I tried eBay and Amazon for 91313-393-003 and I only came up with 91213-393-003? 

Anyone have one with the bolt included?

Bueller? Bueller?


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I have a spare bolt and nut, but no o-ring? It seems I was mistaken, and a plain 7.7x2.3 o-ring will do the job. http://www.davidsilverspares.co.uk/parts/by-part-number/hpart_91313393003/

Only problem will be the delay in getting from Oz to you?

Let me know if you want it?

[djmaynard]

I have a spare bolt and nut, but no o-ring? It seems I was mistaken, and a plain 7.7x2.3 o-ring will do the job. http://www.davidsilverspares.co.uk/parts/by-part-number/hpart_91313393003/

Only problem will be the delay in getting from Oz to you?

Let me know if you want it?

Too funny, I actually do have a bolt and nut very similar to the picture and wonder if they are the same. I knew I tried several bolts and nothing has fit. I think I bought the last one from Korea for $30 plus shipping.


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[The Jimbonaut]

A Timesert is basically a threaded sleeve that is used to repair stripped threads in, say, engine housings.  The kits aren't cheap but if you've got a stripped thread then there don't seem to be too many options to repair it other that a Timesert or Helicoil.  I'm new to all this but from what I'm told the Timesert does a more secure job.  I repaired my stripped thread with the engine in the frame - it's doable but a bit tricky to access, and you also have to be careful to avoid the scarf/metal shavings from falling dropping into the engine housing (I used a lot of heavy grease, and went very, very slowly).

Here's a link to the kit I needed to repair the stripped thread - https://www.amazon.com/Time-Sert-M8x1-25-thread-1812-TIME-SERT/dp/B01MSPN7NH

Not sure about the bolt itself that you'll need but if you can find the specs for it (length/width and thread pitch) I'd be happy to see if my guy has one.  Or if you can find out whether or not bolts from different years' engines can be interchanged then let me know.

I've ordered the o-ring twice now, the ones I've received however both seem a little large for the bolt.  Not sure if that's how they're supposed to fit - I ended up using two generic o-rings that fit more snug and will see if any oil leaks out. 

Let me know if I can help =)