Planning to overhaul the 99.

 Don't forget this ran on standard Norton connecting rods!

Hogslayer, the man who built it John Gregory told (me, not sure who) , that in the early 60s they ran nitro burning bikes with the early 650/Atlas rods that had less meat around the base, the Bracebridge Street jobs, and he never had one of those break either, he said it was just important to have them torqued up to spec, and that the 500/600 torque figures were not used, as he thought this was the problem with the bigger motors, people got the torque figures confused, i.e. tightening up Alas rods to the smaller capacity bikes figures.

Check the bottom-end but maybe do not disturb it, if everything looks and balanced okay.  can the sludge trap be overalled without pulling the crank apart? Just do a top-end overall and an overall check, look at the number of Norton's torn apart, rebuilt and giving problems, refurbished the oil-pump clean out the oil-ways fit an external filter, loose some weight and you might see 105 mph!

Best ever "99" was 114 mph @ Mira,(and they never had downdraft  inlet port heads I am led to believe,) not down much on a 650 Manxman or SS.

John

hello now my advice is to check what year the  crankcases you intend to fit a 650 crank and rods into  as all 99 crankcases  made before March 1961 will not take a 650 crank without major engineering in the crank and cases and barrels  you find the dimensions differ  somewhat,  just let you know to save you some expenses  and time,      yours  anna j     

My 99 was rebuilt about the same time as yours as it featured in the 1995 club calendar (August) and then was dry stored I believe for some time. Probably re-commissioned about 5 years  years ago. It is standard and is an absolute pleasure to drive around. Acquired by me about 3 years ago. Apart from sorting any obvious issues with yours through past use I wonder why any need to upgrade especially as yours seems to have run so well.and given Anna's comment you may be building in trouble. No criticism intended by the why just curious. I also am not an engineer but learning from the site as I go along so inherently conservative on any changes to original spec.. Whatever you decide good luck. Cheers, Hugh   

...and it's a hobby!  Better than spending evenings vegetating in front of the telly and drinking beer...

Whats wrong with the beer?

.. the wrong beer. Timothy Taylor Landlord* is available in bottles and is just (well nearly) as good as draught.

*Other beers are available.....

Hello guys this threads are about a model 99 rebuild not beer you been long waiting for And There is nothing wrong with a good rebuilt model 99 motor that has matching numbers to the frame ,to get a good motor all burrs and dings and uneven surfaces in the alloy castings need to be carefully removed and attention played to any cracking in the alloy casings and All oil ways to be cleaned well and attention paied to the cylinder head valve seats and rocker shaft seat resessis for. Out of round or cracking and change the valve guides to bronze valve guides and recut the seats and change all bearings as a matter of course and do try and get hepolite or BHB pistons and rings or Hap Jones pistons these are quality Japanese made pistons made for Norton Twins ,with carefully attention to these motors you can achieve a good long lasting Norton motorcycle engine and when heating any thing please do this in a safe way like using your domestic oven has gas blow lamps can burn you if not used with care and the protective gloves and safety ware and do things in stage's and do not try to do thing all in one go, safety first now have fun ,yours Anna j

With beer at £4+ a pint who needs it, or the pub.

The Landlord is delivered by my friendly Waitrose driver for £1.50 a pint and I can sit in comfort and drink it without a load of idiots bellowing behind me.

Well I have been "T" total for  24 years, but often miss the company and liveliness of a traditional English pub, admittedly prices are high, (Government taxes) Duty), e.t.c.

However, unlike the Home drinker, I could never see the point of drinking at home on your own, a bit like having a Birthday party n' not inviting anyone, definitely no surprises round the corner on a night like that!

Maybe, "Ian's" are less sociable than "John's"

Must be the Gaelic slant!

John