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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Camshaft wear on Dom 99

Submitted by richard_salt on Sun, 05/07/2020
Forums
Heavy Twins

My 1956 Dominator 99 has a bad clatter from the engine. Very audible.

It is not a bearing rumble. nor a tappet rattle, nor a chain slap.

It seems to be coming from the front of the engine.

The engine has not been run much since rebuilt - probably 15 years ago.  Probably not done 100 miles. Compression test shows 120 psi both cylinders (at 1000m alt)

I suspect a camshaft/cam follower problem.

Does anyone have any experience or suggestions on this before I strip it down?

Richard

Dominator88 clutch

Submitted by david_wardingley on Thu, 02/07/2020
Forums
Heavy Twins

Hello all,

i have a perennial problem with neutral selection . When the engine is not running neutral selection is easy. Start the engine and neutral selection is just about impossible from either first or second gear. Even slowing to a junction in second neutral will not engage while on the move at a walking type pace! The machine is fitted with a Bob newby clutch and a mick Hemings 5 speed gear box. The clutch runs true any clues would be much appreciated.

regards DAVID

 

Oil tank / battery box platforms - differences

Submitted by tony_wood on Wed, 01/07/2020
Forums
Heavy Twins

Hi. My basket case Dommie 99 (1960) came with a very tatty oil tank/battery box mounting platform so I’ve been looking for a better one. I spotted one on eBay and got it for a good price but now I’ve actually received it, I can see a couple of differences to my tatty one. The thing is, I’m not sure what bike my ‘new’ mounting plate comes from. I’ve put a photo at the end of this post. Is one wideline and the other slimline? The ‘red’ one in the photo is slightly shorter and doesn’t have captive nuts welded to two of the holes in the plate.

Thanks, Regards. Tony

 

Planning to overhaul the 99.

Submitted by robert_tuck on Wed, 01/07/2020
Forums
Heavy Twins

Considering how I built the seized, rusty,water filled  Basket case  25+ years ago with very little other than a rebore ,valve grind and new shells, its done very well. It burns no oil,and goes very well (100+) with as much compression as I can manage. I am  thinking that I should do "stuff " while I am still able.The oil seeps around the head joint,the motor is not as Quiet as I would like ,(pistons probably) and the big ends/ rods are a bit of a liability now. I'm thinking ,thunder rods and a crank grind or a 650 crank and rods with case mods to suit and a carefull balance job..

Drive side little end - advice sought

Submitted by anthony_bolton on Mon, 29/06/2020
Forums
Heavy Twins

Dear Members,

I seized my 1965 650SS about 2 months back and upon stripping it I found that I had holed the drive side piston. The machine had been performing a bit oddly for some weeks beforehand being particularly slow on long uphill climbs. I figured it was petrol starvation so increased the main jet size and raised the needle. On the day of the seizure it all happened very quickly just a mile from home and on the flat.

When stripped the piston was ok in the bore but the gudgeon pin was seized solid in the con rod small end.

Laydown gear box - top gear

Submitted by george_arber on Mon, 29/06/2020
Forums
Heavy Twins

As reported some time ago, I have since acquiring my 1956 Dominator 99 frequently had problems engaging top gear and it seemed to have a mind of it's own. For the first time I removed the cam plate detent plunger for inspection and it was obvious as to what was contributing to the problem. The fit of the plunger into the screwed housing was a real ' ball in a bucket fit '. The excessive clearance was allowing the plunger to rock from side to side as well as moving vertically thus preventing a precise location  into the cam plate.

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