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Tach seal mod for 850 Commando
9 posts
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Tach seal mod for 850 Commando
by Mark Cigainero » Mon Mar 08, 2010 6:49 pm
Can you do the tach seal mod for a Commando on a drill press or is a mill needed??? Where do you get the seal. I need to do it on several bikes. Thanks Mark Cigainero
Mark Cigainero
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Re: Tach seal mod for 850 Commando
by Jeandr » Mon Mar 08, 2010 8:37 pm
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Re: Tach seal mod for 850 Commando
by Danno » Mon Mar 08, 2010 9:04 pm
I did mine in a vise with a VSR electric drill and used a Honda seal (forget the part number) but it used to be in the USNOA's tech digest. I have it stashed somewhere. The Honda part may or may not be available any longer.
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Re: Tach seal mod for 850 Commando
by Danno » Mon Mar 08, 2010 9:08 pm
I don't think he was looking for a blanking plate, rather a seal that prevents the tach drive leaking oil.Jeandr wrote:CNW has them at $17 each http://www.coloradonortonworks.com/catalog/engine.asp (look for #111)
Jean
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Re: Tach seal mod for 850 Commando
by Jeandr » Mon Mar 08, 2010 10:36 pm
Danno wrote:I don't think he was looking for a blanking plate, rather a seal that prevents the tach drive leaking oil.Jeandr wrote:CNW has them at $17 each http://www.coloradonortonworks.com/catalog/engine.asp (look for #111)
Jean
I will be off line for a while, got ot take reading lessons or else stop trying to post while watching TV 
Jean
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Re: Tach seal mod for 850 Commando
by littlefield » Tue Mar 09, 2010 5:11 am
I ordered a seal from Bike Bandit. It's the tachometer gear box seal from a 71 Honda CB450.
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Re: Tach seal mod for 850 Commando
by T.C. » Tue Mar 09, 2010 10:28 am
Check the Old Britts website, under Tech Articles.
Fred has a concise write-up with bore size and part numbers.
Fred has a concise write-up with bore size and part numbers.
Just down the road from next to nowhere...
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Re: Tach seal mod for 850 Commando
by swooshdave » Tue Mar 09, 2010 11:43 am
T.C. wrote:Check the Old Britts website, under Tech Articles.
Fred has a concise write-up with bore size and part numbers.
Tach Seal
You probably want to go into town, and find a up to date Jap Bike store,
With a full spares department, a clean workshop, and kean young mechanics.
And ask them if theres a Grumpy Old Bloke out in the Hills, who knows how to fix Real Motorcycles.
Matt
With a full spares department, a clean workshop, and kean young mechanics.
And ask them if theres a Grumpy Old Bloke out in the Hills, who knows how to fix Real Motorcycles.
Matt
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Re: Tach seal mod for 850 Commando
by L.A.B. » Tue Mar 09, 2010 12:57 pm
T.C. wrote:Fred has a concise write-up with bore size and part numbers.
I did this modification some years ago, as I happened to have an odd (if I remember correctly) 7 x 14 x 4 mm rotary shaft seal amongst my supply of spares which looked as if it would do the job.
I drilled the underside of my MkIII's tacho housing to a depth of approximately 4mm using a 14.0 mm drill bit with a hand held electric drill, and then Loctited the seal in position, and it's never leaked since.
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