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Heavy Twins

Description

A technical forum for Model 7 to Mercury

Carburettor Confusion - wrong carb for a Dommi !

Submitted by mike_haworth on Sat, 21/09/2019
Forums
Heavy Twins

Bike is a 1959 dommi '99'.

Over time and throughout a major rebuild I've realised this bike is not standard in many ways. Having rebuilt the engine and gearbox I am now addressing the carburation issues. I stupidly ordered a 376 carburettor kit from Burlin only to discover the carburettor fitted to the bike is a 389/12 (that's what is stamped on it). According to all the reference documentation I have this should be fitted to an Atlas, not a Dominator. The bike does run with this carburettor, albeit with issues.

Norton forks

Submitted by peter_gibson1 on Fri, 20/09/2019
Forums
Heavy Twins

Hi 

I'm building a dominator into a cafe racer and like the external fork spring look do I need to remove the internal springs and can I buy light external springs just for the look

cheer for any info

Manxman Silencers

Submitted by anthony_curzon on Tue, 17/09/2019
Forums
Heavy Twins

Today I went to a company in Kent, and took along a pair of Manxman silencers, mufflers. The owner inspected the silencers, and how they were made. After about five of so minutes deliberation, I was given a price of from £380 to £410 each. He only works in stainless steel, so if you want steel, then have them chromed, then these will not be for you. Stainless steel, can be very highly polished to look like chrome. The silencers, are on the heavy side, so the cost of postage will have to be added to the above cost. Over seas postage will of course be higher.

Slimline tank rear mounting hook

Submitted by tony_wood on Sun, 15/09/2019
Forums
Heavy Twins

Hi. I have two slimline frame petrol tanks, both still in the original grey/silver paint. The only difference between the two is that on one of them the rear mounting ‘hook’ (for the rubber band) is flush with the rear of the tank - you can’t see any evidence of a join between the two surfaces. However, on the other tank, the hook is mounted onto a square plate which is itself tack welded in four places to the back of the tank.

Caburettor issues ?

Submitted by mike_haworth on Thu, 12/09/2019
Forums
Heavy Twins

Bike is 1959 Dommi '99'

When I took the engine down for a rebuild I found that it had high compression (i.e. domed rather than flat tops) pistons fitted. In the course of the complete rebuild I have fitted appropriately sized standard pistons to fit the barrel which is now at  + 0.060"

I have refitted the carburettor in exactly the same state it was in before the rebuild  but I'm wondering if I should now revisit the jetting. I assume, although I haven't checked, that the previous owner would have add to re jet from standard to accommodate the higher compression.

Rebuilt engine blowing oil out of cran case breather

Submitted by mike_haworth on Thu, 12/09/2019
Forums
Heavy Twins

Bike is 1959 Dommi '99'

Just completed a full engine rebuild and, after about 15 miles of running, I have two problems.

Oil is being blown out of my crank case breather. I'm not sure how much, if any oil, should come out but it seems rather too much to me. Does this mean something has been assembled incorrectly during the rebuild, or is there a more obvious cause that is addressable without taking the engine down again ? Please say YES !

650SS Conn Rod - which way round? (Oilway)

Submitted by leonard_urwin on Thu, 12/09/2019
Forums
Heavy Twins

Hi Guys, Preparing to rebuild my 1967 650SS engine.  My trusty Haynes manual shows a nice picture of the conn rod and states 'oilway MUST face outwards - late 650 and 750  engines after engine number 116372.' However, when I stripped the engine the oilways were facing inwards on my engine number 18SS/117285 - obviously a later engine.

Can anyone confirm the Haynes data, the correct fitting direction or give me a reason why this would've changed for later engines?

Cheers, Len

Dominator88 brakes

Submitted by david_wardingley on Thu, 12/09/2019
Forums
Heavy Twins

Hi all ,

the gearbox on the Dominator88 has been replaced now with a 5 speed unit which works very well. The next task is to improve the brakes. Has anyone fitted a twin leading shoe set up on the front? Any problems in installation , does it just slot in to the existing drum? And lastly what make is being used out there a consensus of opinion would be useful before I begin.

david

Featherbed Frame Headstock screws

Submitted by mike_tyler on Thu, 12/09/2019
Forums
Heavy Twins

Hi all,

This is probably a silly question, but could someone tell me what the 2 little H59 screws are for that screw into the headstock / headlug of the slimline featherbed frame?

They are highlighted in the attached diagram.  The parts manual also refers to them as H59 and 21977.  I thought perhaps they are to hold a flyscreen or a nameplate or possibly to enable the head to be lubricated?

Thanks a lot

Mike

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