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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Valve spring replacement

Forums

The exhaust spring pair I removed yesterday has inner length 1.4" with outer 1.55". RGM supply 1.5" and 1.65" respectively. So both have lost 0.1".

I've already ordered and paid for new ones, but now I'm in two minds as usual about fitting them. I doubt if I'll be taking it to 6000rpm, and higher spring pressure will just add to valve gear loads. What would you do on a grey December day?

Copy petrol tanks

Forums

My 88 1955 dominator tank is untested and may leak, it looks good from a distance but has a repair that spoils the chromed area. As no chance of buying this part, was looking at the copy cats tanks from overseas. Has anyone used one for their bike?

Front suspension damper rods

Forums

Hi. At the moment I’m building the front forks of my Dommie 99 project. The fork leg damper rods have a threaded portion at the top, which I assume the fork caps screw onto when the caps are screwed into the stanchions as the caps have threaded holes on their undersides. The upper part of the damper rod also has a nut on it that screws down onto the fork spring top locating ‘spacer’. At the moment I have those nuts screwed down fully tight onto the spring’s top spacer.

Filter Kit fitting ... photos, advice anybody ?

Forums

I am considering fitting an RGM Fiter Kit to my 1959 Dommi. I've seen it described as 'bulky' but RGM claim to have sold thousands ! So, can anyone show me a photograph of one fitted to their machine or even provide a diagram ? Have you any advice on fitting one ? What are the pitfalls ? Do I need to make/source additional parts to effect the fitting ? Is anything compromised as a result of the fitting ?

Mike

Magneto Fade

Forums

The Magnetto on my project 88 as far as I know last run in 1988, would it be possible for it to work? on stripping the machine lot of engine work seems to have been done, but I feel it has never been started as combustion chamber clean as clean. any help on this please.

 

 

Cam fine marks

Forums

I bought a cam for my 88 project from Ebay, The cam does not look worn but has a few very fine rust pits, can I remove the pits with very fine emery or wet n dry? or will the cam need a regrind.

Wondering about a regrind do they need to renew any heat treatment. Thanks in advance

 

 

 

 

 

Head Swap

Forums

My 1955 Dominator has some damage to combustion chamber. I have sourced a bare donor head that looks perfect. can I swap the parts over from my damaged head to the donor, lap the valves. the new donor looks identical apart from the number on the top T2226 on my old part T2225 on the donor part. thanks in advance for any help on the project.

 

Ignition Timing. 1962 88SS.

Forums

I have a Pitman publication of the 1960's that gives the timing at 30 degrees before TDC.( See attached). This differs from some of the other published figures; is it correct ? I use unleaded petrol and rarely go above 65 mph.

                      Jon.

 

   

 

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