running sweet

[Head]

well folks its been a few weeks, the 850 is starting first kick again, few more jobs to do to her, i have couple oul leaks from small areas nothing serious,
need to sort out suspension tho she seems to weave at the back at good speeds on bends only so guessing its the swingarm area , maybe im pushing her too much, i think in next couple years im going to fit an electric start to her save the legs lol, anyways just touching base here hope all is well with ye all

 

[baz]

well folks its been a few weeks, the 850 is starting first kick again, few more jobs to do to her, i have couple oul leaks from small areas nothing serious,
need to sort out suspension tho she seems to weave at the back at good speeds on bends only so guessing its the swingarm area , maybe im pushing her too much, i think in next couple years im going to fit an electric start to her save the legs lol, anyways just touching base here hope all is well with ye all

You may find there's play in the gearbox cradle
Not holding the swing arm pin tight
Kegler clamps or similar are your friend here

 

[KiwiShane]

You may find there's play in the gearbox cradle
Not holding the swing arm pin tight
Kegler clamps or similar are your friend here

True that...well set up isolastic's/headsteady can be your bestie forever

 

[Fast Eddie]

A quick peruse on YouTube of these being raced back in the day by Tony Smith, Peter Williams, Dave Croxford, et al, should be enough to persuade you that it’s unlikely that you’re ‘pushing it too hard’.

ISOs and cradle, as already discussed. As well as head bearings, and even part worn tyres, are all potential suspects here.

 

[DennisMo]

I am installing an Alton right now so contact me if you have any questions when you decide to do yours. With inner primary chaincase off, I took opportunity to install a rear vernier isoelastic and replace both the left crankshaft seal and the gearbox output shaft seal. The project grew as I decided to replace the front Isoelastic with a vernier type, install a Holland Norton Work Oil pressure gauge (It has a metal braided oil line so little risk of failure), clean the Mikuni, install a manual oil anti sumping valve with electrical contact (to not allow ignition if valve is shut). I will likely have electric starter working this weekend!
Dennis
Vancouver

 

[Bonzo]

and replace both the left crankshaft seal and the gearbox output shaft seal.
Dennis
Vancouver

Hi Dennis,

I don't mean to highjack the thread, but can both these seals be replaced from the drive side easily enough (once the primary inner is out of the way)?

 

[acotrel]

A quick peruse on YouTube of these being raced back in the day by Tony Smith, Peter Williams, Dave Croxford, et al, should be enough to persuade you that it’s unlikely that you’re ‘pushing it too hard’.

ISOs and cradle, as already discussed. As well as head bearings, and even part worn tyres, are all potential suspects here.

Fearherbed framed Nortons often have Silentbloc bushings in the swing-arm. They handle better when those are replaced by brass. What does that tell you about isolastics - CRITICAL ?

 

[baz]

Fearherbed framed Nortons often have Silentbloc bushings in the swing-arm. They handle better when those are replaced by brass. What does that tell you about isolastics - CRITICAL ?

"Brass bushes" ?

 

[Tornado]

Hi Dennis,

I don't mean to highjack the thread, but can both these seals be replaced from the drive side easily enough (once the primary inner is out of the way)?

Yes. Gb drive sprocket also needs to come off for gb seal.

 

[DennisMo]

Just to add to what Bonzo replied, your best friend will be a 1 1/2 inch spanner (got it for $Cdn 29 at a local auto parts store) to get the nut off the gearbox sprocket while you stand on the rear brake at the same time! But what I cannot understand is why the nut is left hand threaded!!

 

[Torontonian]

Just to add to what Bonzo replied, your best friend will be a 1 1/2 inch spanner (got it for $Cdn 29 at a local auto parts store) to get the nut off the gearbox sprocket while you stand on the rear brake at the same time! But what I cannot understand is why the nut is left hand threaded!!

I think it's about direction of acceleration forces . Can only get tighter , as opposed to backing off ?

 

[DennisMo]

I think it's about direction of acceleration forces . Can only get tighter , as opposed to backing off ?

I think it is the opposite to what it should be. On British wire wheels, the left side wheel spinners are right hand thread because rotational force would try undo them if they were left hand thread.
Dennis

 

[DennisMo]

I think it is the opposite to what it should be. On British wire wheels, the left side wheel spinners are right hand thread because rotational force would try undo them if they were left hand thread.
Dennis

And the crankshaft and gearbox seals were very easy to get out. I drilled a very small hole into each of them and threaded a tapered screw into them and pulled them out.
Dennis

 

[htown16]

You can find the 1 1/2 wrenches in the section of the auto parts store where they sell the trailer hitches. They fit the nut on the hitch ball.

 

[Fast Eddie]

Fearherbed framed Nortons often have Silentbloc bushings in the swing-arm. They handle better when those are replaced by brass. What does that tell you about isolastics - CRITICAL ?

Absolutely Al, isolastic condition and adjustment is indeed critical, as already mentioned.

 

[DennisMo]

Absolutely Al, isolastic condition and adjustment is indeed critical, as already mentioned.

I just put new vernier isoelastics in engine front and back. I have read what vibrations happen if the front or back are too tight but what happens if they are set too loose, say 15 or 20 thou?
Thanks
Dennis

 

[Bonzo]

I just put new vernier isoelastics in engine front and back. I have read what vibrations happen if the front or back are too tight but what happens if they are set too loose, say 15 or 20 thou?
Thanks
Dennis

I don't know from experience, but I'm pretty sure it would handle like a pig.

...or a bucking bronco.

 

[Fast Eddie]

I just put new vernier isoelastics in engine front and back. I have read what vibrations happen if the front or back are too tight but what happens if they are set too loose, say 15 or 20 thou?
Thanks
Dennis

It’ll ride like somethings loose. Cos, well, it is !

Correct procedure and settings are in the manual. But that’s only a starting point. Due to differences in crank balance and personal taste, different settings are used by some.

I set mine to zero measurable clearance, but with easy movement when I lever the cradle. However, my crank has been dynamically balanced, so this may not suit all.

I can’t think of any reasonable argument for running them at 20 thou though.

 

[baz]

I just put new vernier isoelastics in engine front and back. I have read what vibrations happen if the front or back are too tight but what happens if they are set too loose, say 15 or 20 thou?
Thanks
Dennis

As a rule of thumb the looser the smoother
The tighter the more vibes
I adjust mine the same as Eddie
Just find your own sweet spot

 

[DennisMo]

Thanks.