I’m having trouble getting clutch clearance on my laydown box with a GT175 mainshaft ( it’s a single bitsa) does anyone know where I can get a GT165 as fitted to the twins?
cheers
Dan
laydown box
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Hi Anna, I hope you’re…
Hi Anna, I hope you’re keeping yourself busy in these difficult times.
my problem isn’t clutch lift (if only it were that easy) it is that the primary chain fouls the swinging arm boss on the frame, as a consequence there is no gap for the chain case.
I thought my issue might be the clutch spider allowing the clutch to move too far down the mainshaft splines, but I have 3 clutches, one with a new RGM spider, and while the clearances are all slightly different the problem still exists.
For the moment while my gearbox is apart the easiest way for me to increase the clearance is to fit a mainshaft from a twin (in has GT165 stamped on it) which is about 1/4 inches longer.
Cheers
Dan
as they say a picture is worth 1000 words!
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Chain Alignment
Dan....if you move the clutch outboard the primary chain will no longer align with the engine sprocket. This is not a complete disaster as there are 3 variations of sprocket for the Singles with 3 different chain wheel positions for you to choose from.
I had a similar problem to yours on my Jack Moore Norton Twin special. To solve this, a thick spacing shim was placed behind the clutch to move it outboard. I then had a special engine sprocket machined to help get the chain alignment back.
The photo shows the damage being done to the inner chaincase with the original set-up.
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real problem
hello now after seeing your snippet photo you have a real problem as far as I can see the whole thing is not inline the clatch should not be any were near the swingarm and the spider has a set of rubber in the centre of the clutch and you need the tools to remove them, witch, I have, So I would have a look at the alinement first and see what amiss and maybe someone as fitted a shorter main shaft as there are different lengths of main shafts lets hope you get this sorted all the best anna j
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Hi Phillip Yes I have a…
Hi Phillip
Yes I have a number of different engine sprockets with different offsets, so should b ok on that front, I’ll look at a spacer with the clutch I have but am not sure how it would work, do you have a picture of it? What needs to happen is for the stop in the splines in the spider to be moved inboard by about 3mm.
i thought a new mainshaft would be easier!
Dan
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Win some lose some
A change of shaft would be better. On my gearbox after moving the clutch body outboard I then found the thread for the nut minimal. Below lists shafts of different lengths.
Attachment and below may be of use.
NORTON LAY-DOWN MAINSHAFTS
Application Part No. Stamp Mark
Twin Cylinder D12/324 GT 165
Single Cylinder D E12/324, E12/324 GT 175
International GT 185
Manx GT 191
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crush drive
hello now for the crush drives in the centre housing the spider there are 6 rubbers and you need special tools to fit them, witch, I have and made by me the NOC does not stock these yours anna j
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The last time I did my…
The last time I did my rubbers I put the bike in top gear ,locked the brakes on and used my exhaust rose spanner to turn the clutch center.
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hello now my Norton Dominator model 88 built april of that year as the laydown box and if you cannot get any lift on your clatch there is a ball in between the mushroom lifter and the rod and you can adjust the arm by slacking off the nut on the arm and set it up as far as you can with the worm as far in as you can then nip the nut up and try that you may have do this more then once to get the right adjustment and have the adjuster on the clutch cable as slack as you can is a bit of job to do, but have fun and be patient and take you time do not try rush the job , yours anna j