A10 sidecar crank

[Rocket Racer]

my other cranks are sadly not to hand today, but putting a bare "heavy" crank on the bathroom scales shows 13kg of ballast.
I can weigh the other cranks in coming weeks or does someone else have a bare SJ or the '58 onwards common LJ type to weigh and report on ?

[A10Boy]

I tried to weigh one of my spares but her kitchen scales only go upto 8 KG and it was much more than that.

[Rocket Racer]

I've retrieved my later type crank and it weighs in at 10kg on the bathroom scales.
Certainly in the heavier crank the extra weight is not carried in the flywheel but in the centre section inside the flywheel.

[Rocket Racer]

I had my "heavy" crank motor at the track in the weekend for the first time. Nice light bsa pistons fitted. Med comp 8.x:1 road rocket type.
yes on methanol, a 357 cam and a twin carb head with 10TT9's fitted. Pulling 2 people round a track. She was no slug! I was impressed with the legs she showed. The track is also quite hilly (hampton downs for those with utube) . We were reining in the white 750cc triumph kneeler shown behind us on the picture on our humble sitter.
The crank may weigh a bit but the bike flies 2 up with a chair! As a solo this would still be a stunning motor for the road wink2

[A10Boy]

Thats brilliant well done. Have you compared it to a std LJ crank in that motor / combination?

[Rocket Racer]

Thats brilliant well done. Have you compared it to a std LJ crank in that motor / combination?

sadly still broke from building the chair, but have most the parts for a similar second motor, albeit single carb super rocket head. But likely to be some time off yet.
But I would have no hesitation in recommending the "heavy" crank