Tacho Drive Seal Fix

Brooking 850 · Jan 15, 2012

Hi guys have been looking for the seal number used in the tacho drive housing upgrade, can't access some of the technical links that I have listed.
Bike # 2 has a seal and an O ring set into the shaft, can use that if necessary for bike #1 but the little clevis at the top of the shaft is badly worn on one side.
need to adapt Bike #1 properly
Thanks and regards Mike

bmwbob · Jan 15, 2012

My file says:

Honda seal #91207-222-000

Norton Tach

madass140 · Jan 15, 2012

i have those seals, but would probably cost more to ship than the seal is worth,

Brooking 850 · Jan 16, 2012

Hi guys thanks for the seal no., will check it out tomoprrow.
In the meantime here is the mod I found in Bike #2 , bush in the bottom with an O ring set into the drive shaft, and the mod I did using 2 x 108 O rings
Have tested mine and it seems to work so far.
Thanks for the replies
Regards Mike

batrider · Jan 16, 2012

I put an extra o-ring in mine (no machining) as a temporary fix the second week I had the bike and it is still not leaking almost 40 years later. Kept saying one of these days I'll send it off to be fixed properly!

Hobot · Jan 16, 2012

Some times its snot the tach drive but front of barrel seam weeping, ugh.
Some like me and Wes have side tracked it temporary or permanent by capping off the bugger.

Brooking 850 · Jan 16, 2012

hi Steve, checked that out as well, although no leaks from the barrel/case joint.
symptom was easy to spot when riding as a fine slow flow up through the tacho cable hex nut , anyhow problem seems fixed now,7/16" ( 11.5MM) drill bit and 2 x #108 (little fat f@#@#kers) in the hole on the shaft , packed above the O'rings with grease, test ride yesterday proved it is sorted.
Like the idea of the O ring set into the shaft as on Bike #2, but think who ever did the mod, machined the groove way deeper than need be, as there are some very small low profile O rings available
Regards Mike

ZFD · Jan 16, 2012

Drive housing with oil seal available under part #06-7254, seal only under #06-7255 from Andover Norton or from one of our distributors. In fact, if a customer orders the drive housing under one of the old numbers these days he automatically gets #06-7254 from us.
Joe/Andover Norton

rvich · Jan 16, 2012

ZFD said:
Drive housing with oil seal available under part #06-7254, seal only under #06-7255 from Andover Norton or from one of our distributors. In fact, if a customer orders the drive housing under one of the old numbers these days he automatically gets #06-7254 from us.
Joe/Andover Norton

I assume (there's that word again) that the old housing can be drilled out for the seal?

Russ

Brooking 850 · Jan 16, 2012

Thanks Joe, any chance of a pic so I can see the seal?
Regards Mike

DogT · Jan 16, 2012

I sent mine to Fair Spares in San Jose along with the gearbox cover and as I remember all he did was make a little groove in the drive for an o ring and make a place in the housing for it to fit. He also put real seals in the gearbox outer cover and now I have a bike that doesn't drip out of all the levers and connections. I remember that tach drive would pool oil behind the drive in that little area and it was always full of oil, splashing on everything behind it.

Isn't it wonderful you can fix these old bikes?

Dave
69S

LogVil · Jan 16, 2012

ZFD said:
Drive housing with oil seal available under part #06-7254, seal only under #06-7255 from Andover Norton or from one of our distributors. In fact, if a customer orders the drive housing under one of the old numbers these days he automatically gets #06-7254 from us.
Joe/Andover Norton

I am not seeing these part numbers come up on the website.

ZFD · Jan 17, 2012

Mea Culpa! Forgot to put them on at the time- they are now up. The oil seal 06-7255 is nothing spectacular, just an oil seal. Don't have a photo right now, but at 1.35 Pounds Sterling it is not exactly costly.
All old housings can be machined to accept the oil seal.
Joe Seifert/Andover Norton

Tacho Drive Seal Fix

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