Good morning, I have just acquired a second hand starter kit for a7/10 it was taken off bike because the sprag bearings had disintegrated ( quite a mess ) I have got and fitted new ones now ,looking at the driving chain from motor up to chain case , the chain on this looks like the size of a dynamo chain ,although it had been working does anyone know if this is the size chain that is fitted , regards Roy
( i can't find any contact for Steve McFarland who designed and built these )

Just to add if you are not allready doing so ,the throttle must be wide open when doing compression test,regards Roy

Expand the photos and look very cearfully to the condition of some of the items  , I see on EBay a new pinion and drive spindle unused the seller states it was purchased from Phil Pearson engineering,which in the past have been top quality ,take a look item number 295795135832

Dan ,if not allready first check the helix on both the pump drivespindle and the engine. Pinion gear to make sure they run square ,you can see in the 2x photo I sent the difference against the set square pattern one is not. Correct , looking at your pinion gear then I think to be safe make new woodruff key ,the length of the spindle may not be a problem  but you need to Check cearfull when you assemble ,regards Roy

Hopefully a couple of photos are attached ,you can see the original items are square ,and the pattern drive spindle the helix gear is incorrect,also the diameter of some pattern drive spindle are undersize ,the original spindle measures 0.6345  ,regards Roy

Hopefully a couple of photos are attached ,you can see the original items are square ,and the pattern drive spindle the helix gear is incorrect,also the diameter of some pattern drive spindle are undersize ,the original spindle measures 0.6345  ,regards Roy

Before you fit the gear in case hold them up togeather  helix gear should mesh nicely and by sight should be at exact right angles , a lot of aftermarket are miles out ,also measure the shaft and the inside of case ,again some pattern ones are under size and rattle around in case when running ,hope you understand what I am trying to say ,regards Roy

Just aquired a blazing saddle brand for my bsa a10 ,for the price etc I am very happy with it , it feels very firm , and nicely finished,

Through my experience  ,pattern parts again assumed the part you bought is a repro , the mag /dyno and bsa A10 fibre gears are  a problem ,pitching , I have seen them run like that and stripped all teeth of and what a mess ,

Re wassell carbs ,fitted to my A10 ,i must say it carburates extreamly well , I have though on a couple of times throttle stick ,it happened the other day whilst out ,luckly i was in the lanes and no traffic , it did free off quite quickly ,but upset my confidence ,couple of things  when twisting throttle with choke on it felt nice a free ,but when choke was lifted it dint feel so good , stripped carb ,the spring was quite tight in it hole ,with small sander band i linished the hole ,was quite a lot of the anodiseing removed , smoothed of top edge ,now spring moves more freely and feels much better , the machining in the throttle bore wasnt to bright so had no option with some very very fine tape I smoothed it out ,again feels a whole lot better ,
While carb was in bits i noticed a bit of a notch cut out on the float ,it was caused by the tickler ,pin was very sharp on end ,also found the tickler pin was to long it was still pushing float when float was bottom out ,I removed approx 1/16 from scroll pin and smoothed the part that touches float , had i left this much longer
The float would then have been holed ,a replacement now fitted ,and back running ,

Anyone use starter rollers ,if so any feed back on type/make and do they do the job I have just have just made a set ,it was a bit of a mine field choosing a suitable motor ( car starter motor) and get the gearing somewhere near ,also battery amps and CCA rating , they can now start my A10 from cold so getting there

Some had fine splines ,and some had tapers

Plunger and swing arm ,are different ,they have different bearing size in brake drum ,

I have used GPM Gandini many times ,on average. Piston to bore clearance used 0.0045 alloy barrel and cast iron liner , std cast barrel may be 0.005  ( no seizures ) , that's my preference but please await more reply's
From others ,

You would normally feel the engine breathing yes ,if you take out the valve and start bike with out it in you would /Should hear it breathing ,and if oil is getting around timing gears etc you would get oil/vapour come out of breather hole , obviously put valve back in when riding bike