Royal Enfield Bullet 350 NOS crank runout checked!

I meant to say 35 thou, not 25 for what it's worth, but you can hardly miss it in any case! Perhaps this new old stock Indian 350 Bullet crank had some rough treatment after leaving the factory - I would like to think so!

[@madeinyorkshire52]

WOW - shockingly far out - can’t believe that was assembled with that run out! Good job the owner has got an expert (you!) to look into this. You can also see the misalignment by just looking at the journal where you have the DTI mounted.

[@ianwarriner8193]

You don't need clocks to see how bad the run outs are 😮

[@ianwright3971]

Better to run the crank on the mainshafts where the bearings sit and the rotating crank is actually mounted in use rather that the centers in the ends of the shafts...Original jigs ran the crank on knife edges where the bearings sit.......

[@paulhenshaw4514]

To date, truing hundreds of cranks the way I do has worked fine, even under racing conditions.

[@norsehall309]

G'day Paul, if anyone had just put that in a motor like that it would wear out in no time, good thing the owner sent it to you, you'll fix it no problem your the best a doing this type of work, cheers mate, Neil 🤠.

[@ElectricSmurf]

Shocking! I saw the gap pretty quick…was this a drunk apprentice’s attempt on a Friday afternoon?

[@hermangibbs8163]

Thanks Paul.

[@leslieaustin151]

Crumbs! Surely that’s been dropped (from a height, onto concrete!). It also looks like the shaft on the chuck-side is bent, but maybe it’s the flywheel pulling it up and down. Doubtless you’ll work your magic on it! Les

[@billykershaw2781]

I can understand the rise and fall of the crank...but the varying gap... seated correctly? Worn bearing? I'm no mechanic, and I've saved myself a fortune by accepting that!

[@whalesong999]

It's surprising how malleable some flywheels are. Back in the early '60, some flywheels were so soft that clamping them in a vise would show the grip marks of the vice's jaws, indentations (Matchless G2).

[@neilmcintosh1200]

I'm impressed. Perhaps this is the reason it was never fitted.

[@PatrickWhitaker-ls2cs]

Like the front wheels on a a clowns car 😂

[@tomtaylor6163]

I was a machinist for years. That’s bad runout. We rebuilt submersible water pumps . We would straighten shafts by whacking them at the high spot with a dead blow hammer. But that ain’t happening here lol😅

[@whalesong999]

First built-up crank I saw getting rebuilt was trued with a dead-blow hammer, in the man's hands no less. I went on to use the same method in a Suzuki/Kawasaki shop and always got within .002" without much fuss.

[@tomtaylor6163]

@@whalesong999 You are absolutely right. We also would use a torch sometimes and apply the heat at certain points on the shafts and we would get the long water pump shafts very straight. By the time these pump shafts were installed in the final motor they would have maybe .001 -.002 inch runout at the shaft end.

[@pw601]

I can't help wondering if the cranks that were fitted at the factory could occasionally be a bit "off", like this one?

[@andrewslattery403]

Friday afternoon crankshaft?

[@Classics-in-the-sun]

Hi Paul
What is a advantage of fitting a 500 con rod ? Through the 350s and 500s had the same stroke

[@paulhenshaw4514]

The 500 conrod has a wider small end.

[@davefrench3608]

That’s appalling!

[@paulhenshaw4514]

That's putting it lightly!