Crank shaft part codes?

[SpookDog]

@declan

You see what I’m saying? Your 3mb barrel started of life as a 56mm bore, not a 56.5 (3bn standard bore) the 3mb barrel needs the later 50.7mm crank. Not an early 3bn one...

The crank matches the barrel, not the piston. I just wanted you to get that right

[SpookDog]

Just out of curiosity: What carb do you have on your bike? Is it the early 88 round slide 26mm or later flatslide 28?...

[declan]

@spookdog it's a flatslide but the entire bike is a mash up of different dts litteraly nothing is original I don't think the loom is nor the engine not plastics or seat everything is from a different dt from the many previous owners

[declan]

@spookdog yeah I understand what you're saying but to be truthful I have no idea what crank I've ordered it was literally the cheapest one on eBay that's in working condition so I'll throw it in the cases and if it fits the bearings okay I'll check the squish and see what stroke it is and act accordingly

[declan]

Crank came not long ago and test fitted without the engine innards and the play is exactly the same there must be some sort of defect with my main bearings despite them being genuine and only 4 minutes old I can't feel any play in the bearings with the crank out though it's proving to be a tad frustrating

[declan]

Removed the crank seal so I can see exactly where the play is coming from its the the crank surface where it presses into the race (as suspected) but the crank fits very tightly into the race has to be pressed in its almost like the race is tapered and I've got it reversed, main bearings aren't tapered at the race are they?

[SpookDog]

@declan

This is a bit confusing, didn’t you say the bearing slipped on in your other thread?

[declan]

@spookdog yes but on the otherside it turns out both cranks are worn out but in very specific ways it's very annoying but I'll just get a new one at some point

[markus.w]

@declan that's annoying for 2 of them. is it possible to get it reground and fit oversize bearing?

[declan]

@markus-w I'm sure it's possible but I'm just not gonna go to the hassle I think either a new crank or just forget about it gambling on used cranks just isn't ideal I gave it a try atleast, gonna get my other bikes built and sorted then I'll circle back round and finish the dt off maybe winter

[Calum]

@declan When you said new, I thought you meant new new. You can get brand new cranks for these bikes.

[declan]

@calum yeah I do mean new new just figured I'd try a used one first