not a caferacer

been busy again after iom
the primary is sorted and ignition is mounted at crank
i made a small degree disc on the belt^drive so to be able to check/adjust the timing in the future




i also encountered some problems with the RGM (Heyward?) belt . The diafrahma spring would not go in and the slot for the circlip was too narrow .It took some machining to sort this out , only to find the topic about that later

Report this postReply with quoteRe: Primary Belt Drive Pros and Cons?
by comnoz » Sat Oct 08, 2011 4:42 pm


Cons with the RGM drive are the clutch drum usually needs to have 20 or 30 thousanths removed from the outboard end of the splines so there is enough room between the circlip and the splines to allow the diaphram spring to go slightly concave and apply correct pressure to the pressure plate. If you make the clutch stack thicker so the diaphram spring does not need to go concave you will be rewarded with a heavier than necessary clutch pull and more clutch drag.

Sometimes with the RGM front pulley the center will be a little too large and the backside of the pully will contact the crank seal and destroy it. I have had to exchange pulleys or use shim stock under the pully to keep it from going on too far from time to time. JimNo Carbs

i lost yet another battle agaist my PC so sorry to start another window
another problem i had was that the kickstart pawl was a wee bit too large and although it returned perfectly when on the bench , it did not when assembled in the gearbox . So when pushing the kick down it did not turn the engine over
because it did not engage inside first gear
the orange bit is where i had too remove a bit of material
other culprits :90/90 tyre too wide for front mudguard so eased tyre walls a 'bit'
commando-chain too wide , rubbed on chainguard .i was going for as wide and strong as possible for iso-setup . Now went for moto-x chain ,supposed to be strong and narrow
rear wheel would not spin freely due to a ding in rear sprocket groove (where brake plate goes in )

finally i found that my atlas exhausts are not correct (atlas is what i need as the exit out of the head is the same as commando but follows domi-lines for the rest )
that ' s it folks so far
i really must put myself at this project because next comes a ducati 900TT replica, yes i know ducati never made those so i could call it a TT3 and i would like to get on with that one

the electics have almost been sorted , apart from the revcounter (see seperate post )
wheels and brakes are fitted and sorted
cables have been made , i found an old alloy twin pull twistgrip (early sixties i think ) and carbs synchonised staticly

as my old pc gave up the ghost i cannot post pics yet but will ask my daughter to do so when she gets home

clutch is sorted now
this was not tha easy as a diafragma spring as fitted tocommando needs much more lift than a std dominator one , as domi ones have a clutchplate wich lifts off squarely and commando only lifts at the centre
as i had only 1.3mm lift with the std laydown cluch actuating arm and i needed at least 1.8mm i had to make a sort of lever to get 2mm of lift

sorry but pics will follow later as i still have got no pc on wich i can work -- this has been solved as you can see

this is the timingcover welded back together after i could not find a decent replacement . I needed an early commando one , but without the revcounterfixing on the camshaft , so welded all the holes up and for safetys-sake ( pinholes after the welding ) aplied plenty of epoxy over the weld . it will need a polish but looks promising
as these early timingcovers are used with a magneto ,you need to replace the intermediate-spindle with an early spindle as well . these are longer because the alloy boss on the timingcover into witch the spindle locates is shorter on the eary ones
i made p a spacer to fill the gap as well , between camshaft-chain-pinion and timingcover , although i do not think it is really necessary as the chain will allign the sprocket
the reason of the difference between those 2 covers is of coarse the sprocket for the mag on the early type

a big thanks for EVA for putting the pics in

the bike is now copleted , apart from getting the petseal out of the fueltank......................................