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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Push rods

Forums

I am midway into rebuilding the top end of my 1956 Dominator 99 and on checking the push rods I have found that one of the exhaust push rods is badly bent and the other three are scored. They are tubular aluminium with steel ends.

Can anybody please advise me what the correct overall length of the exhaust and inlet push rods are for the 99 and a recommended suppler of new ones.

I assume that the camshaft is standard although I have no history of it's previous rebuild. I have done approximately 400 miles on the bike since purchase earlier this year.

George 

Primary drive - conventional or belt?

Forums

Hi,

I’m going to have to completely replace all of the drive side parts of my basket case Dommie 99 (1960). I’m dithering between a ‘conventional’ primary system or a belt drive system.  I have no experience of belt drives but have suffered with a leaky primary in the past  so would like to hear opinions on which type of primary drive people have used and what the pros and cons are.

Also, if anyone out there has real-time experience of fitting a belt drive to a Dommie, I’d be interested to hear how difficult it is to fit and how well it works.

Valve spring length

Forums

Hi

im replacing the valve springs on a 1958 99 and the Hayes manual says the length should be

outer 1.700in

inner 1.531 in

which the ones I’ve taken off are just slightly shorter(reason for changing)

i ordered a set for a 500/600 part number 06.7174 put when they arrived are 2in long

any help on which part number I should be ordering 

cheers Pete 

plunger madel 7

Forums

Hello Every one. 

This is my fisrt post so I hope this question has not been asked before. Does anyone know why my plunger model 7 handles ok when on twisty roads. But does not like going straight when on a straight road, it feels like there is a strong side wind that hits it in gusts. Also when slowing down from any speed above 30 the bike gives the feeling that the rear tyre is flat or there is oil on the rear tyre.  Horrible feeling, I have checked the plunger arangement and the front forks and so far not found anything wrong. Any ideas what is wrong.

Ignition timing

Forums

Hi 

I’m rebuilding a 1958 dominator the engine’s out and on a bench head off so nice and easy to get at everything 

my question is should I set at 32 btdc or slightly retard it to suit modern fuels it has the standard auto advance on the mag

im trying to get it right first time cheers Pete 

Valve springs

Forums

Hi

on dismantling a 1958 dominator 99 cylinder head I’ve found some fibre washers under the spring bottom cups that do not show on the drawing I have just wondering if they should be there or has some one added to tension springs

 

 

 

 

 

 

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