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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Atlas forks?

Submitted by neal_whitehead on Mon, 01/03/2021
Forums
Heavy Twins

Hi as a newbie I was enquiring if someone with more knowledgeable could help me identify the forks om my 1966 Atlas as the appear to be the commando type, the yokes are silver in colour and the nut is on the bottom yoke and the pin is attached to the top yoke. The bottom legs only have a stanchion collar with no chrome sleeve. The legs are also fitted with gaitors. I need to change the stanchions so how can I identify them so that I order the right ones. If they are not correct is there any benefit in keeping the commando set up and can I fit a standard steering damper to these yokes.

99 deluxe oil tank plumbing

Submitted by peter_wharton on Mon, 01/03/2021
Forums
Heavy Twins

Hi,

Could someone help me with the oil pipe plumbing on my 1960 Dominator 99 deluxe please? I omitted to take a picture before disassembly.

The lower connections are feed and return, I believe, but I'm unsure about the ones below the cap (see picture). 

Perhaps one from the breather, then other to the chain guard? And if so, which way round?

Peter

 

 

Dommie 99 starting Fuel Reddex

Submitted by hugh_coombs on Mon, 01/03/2021
Forums
Heavy Twins

Yesterday started the 99 after being left for some time but had to kick the bike for what seemed like hours till exhausted. In fact left for a while between efforts  for my leg to recover. Battery fully charged and distributor ignition. Eventually started (rested over night) following a 'cough' which gave me hope and then first time every time ticking over excellently. Strangely the bike had just been left and its attempt to start was a first kick after the over night rest.

Kick start issues

Submitted by david_cooper on Sun, 28/02/2021
Forums
Heavy Twins

Every so often I read warnings about catastrophic problems if the (a?) lay shaft bearing is on its way out. Kick start lever misbehaving... but which bearing in this? Is it the one deep inside the box (how does that affect the kick-start?)  or is it the bush inside the kick-start outer shaft? And does it affect all boxes from Doll's head to AMC? And what are the early symptoms? If it's an outer bush, I imagine only the outer cover needs to come off to inspect? (for Doll's head...both covers for later boxes?)

Model 7 final drive chain

Submitted by doug_robertson on Thu, 25/02/2021
Forums
Heavy Twins

Hi

I fitted a 5/8 x3/8 chain final drive chain to my 1952 Model 7 plunger, from the spec in a Main-Smith manual.  Got the bike running, registered and then found a couple of oil leaks.   So took it apart this winter and noticed the chain had rubbed the face of the gearbox and also the inside face of the chaincase.

Did I fit the correct size chain or should it have been a 1/4 in chain?

Dominator 99 Electronic ignition

Submitted by hugh_coombs on Thu, 25/02/2021
Forums
Heavy Twins

Just been think about fitting electronic ignition to the above. I realise this topic comes up regularly but looking for general guidance. Have fitted the above to my 1971 OiF Bonneville and it has been a revelation in terms of starting over many years. - normally first or second kick. Bike acquired in 2004. Just got machine out of garage tickled carbs and not started in 6-7 months but started on 5th kick and then after various rests from cold first time. So thinking about this for the 99 which I have had for 3 years.

Clutch/brake levers on 650SS

Submitted by david_francis on Tue, 23/02/2021
Forums
Heavy Twins

I thought it was about time I fitted new cables to the fronr brake and clutch on my 650SS,as they've both been on the bike for years, so I ordered one of each from Venhill Engineering. They arrived this morning. However, they don't fit. The purpose of the new clutch cable, apart from the current one being old, was to try to lighten the clutch action. I know that the 650SS has a reputation for a heavy clutch, but I could do with the forearms and hands of Popeye to make it comfortable.

99 running rich.

Submitted by robert_tuck on Sat, 20/02/2021
Forums
Heavy Twins

My  single carb  376 with a light filter  persists on running rich  and sooting plugs.  Even the expensive fine wire ones.  And despite my best efforts they are not happy to be cleaned  as the soft ceramic insulators are now not glazed and soak up any oily soot .  The mixture screw needs to be 3 turns out to keep  the mixture somewhere close.

Model 7 rocker oil feed + oil pressure gauge

Submitted by paul_satterthwaite on Mon, 15/02/2021
Forums
Heavy Twins

Just after a bit of advice. I bought my 1952 500cc twin in a large bits basket case. it's now 85% complete and I'm just putting finishing touches to it.  I have an oil tank with union and pipe on return. I plan to fit low pressure rocker feed one into two with a tee to supply my pressure gauge in tank. Do I need to do anything specific, as I was just planning on using small bore rubber hose to join oil tank union pipe to rocker feed and tee to pressure gauge pipe.

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