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Heavy Twins

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A technical forum for Model 7 to Mercury

Is it worth smoothing the manifold?

Submitted by tony_wood on Mon, 27/01/2020
Forums
Heavy Twins

Hi.

The carb manifold of my Dommie 99 is quite rough inside. I think it’s just the normal casting surface but it does feel rough. Is it worth smoothing the internal walls of the manifold? The bike is just going to be used on the road as a daily ride so I’m assuming there isn’t any point in giving myself more work (smoothing the casting). However, I just thought I’d ask in case the general opinion is that it would be beneficial.

Thanks

Regards

Tony

5/8”x3/8” sprocket/ brake drum

Submitted by peter_bowman1 on Sat, 25/01/2020
Forums
Heavy Twins

Yet another query from the worlds slowest Triton build.

Can somebody please tell me if it is necessary to source a new brake backplate when fitting a 5/8”x3/8” sprocket/drum to replace a 1/4” sprocket. I bought a wider sprocket off eBay (will I never learn) and it is slightly deeper than the original and ‘kisses’ the backplate slightly when rotating.

Can I perhaps space the the backplate with a very thin washer/shim or was there a complementary backplate introduced with the wider chain size spocket?

atlas alternator position ?

Submitted by andy_johnson on Sat, 25/01/2020
Forums
Heavy Twins

hi , i have an atlas motor fitted to an ajs , coming round to refitting the chain case (after an engine rebuild ) the position of the alternator in relation to the rotor is puzzling me , it only sits halfway into the alternator ? i found this when i stripped the motor for a rebuild so it must have been working before i touched it  ? or not ? anyone else had experience of this ?

Atlas clutch leaver presure

Submitted by alan_rogers on Sat, 25/01/2020
Forums
Heavy Twins

I am currently rebuilding a late 1966 Atlas, the clutch lever takes considerable amount of pressure to use, considerably more than my other bikes which include a 1967 650SS, 1957 ES2 [both of which have a similar clutch] or my 1969 Fastback. The Atlas has a brand new drum [RGM] 7/8 lever pivot, I have purchased new springs [no difference], my cable is new and routed the same as my 650SS, I am now looking at the gearbox end and note the activating arm is different between Dommy 04-0029 and Commando 06-0715, has anybody tried a Commando arm or haver any other suggestions?

Dominator mudguards

Submitted by richard_freak on Sun, 19/01/2020
Forums
Heavy Twins

Good morning, I am rebuilding a 1958, 99. The bike was bought as a barn find which had alloy mudguards. I want to return it to standard. Has anyone bought the Indian made units and would they recommend or do you know an alternative manufacturer .

Gearbox Oil in 1959 Dominator

Submitted by mike_haworth on Thu, 16/01/2020
Forums
Heavy Twins

During an earlier discussion on the problems oil getting from the gearbox into the primary chain case someone (forgotten who) stated that he used EP90 oil in his gearbox. So, what should I do ? In the original Norton Manual I have (although it's for an '88' not a '99') it recommends SAE 40 in Summer and SAE 30 in Winter. It goes on to say "these oils should be used in engine and gearbox".

In my Haynes Manual it recommends Castrol GTX for the engine and Castrol Hypoy (doesn't give viscosity) for the gearbox. Who is right ?

Mike

Commando clutch in Dominator 99 - Oil in Chaincase

Submitted by mike_haworth on Thu, 16/01/2020
Forums
Heavy Twins

Bike is 1959 Dommi '99'

I introduced this topic some time ago and received a lot of advice. Since then I've run the bike with the belt drive and commando clutch in place. Now, having looked inside the primary chain case I've found oil. It appears to be coming from the gearbox, but still need to investigate further. If it is from the gearbox in previous correspondence it was suggested that a 1/4" silver steel push rod would solve the porblem. Where should I look to buy such a thing and is it usable in this form or does it require heat treatment to harden it ?

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