Crank hard to spin by hand

[joshrabbitt14]

After I rebuilt my bottom end I put it back together and the crank is hard to spin. Is that how it is supposed to be?

 

[yzrider]

well, if the topend is assembled, then yes cause it should have compression

 

[Kgibson]

I tap each end of the crank with a board and hammer and that sets the bearings on the crank...it will spin alot easier

 

[Luni]

If the head is on it, and you have a spark plug in there, yeah its gonna be kinda tough. Without the spark plug in there, it still builds a little compression if the head is on, but you should be able to turn it with the flywheel, and definately by hand with the kicker.

 

[joshrabbitt14]

This is just the bottom end no top end on it

 

[Luni]

Wait, so you dont even have a cylinder on there and its hard to turn?

Then disregard what I said. Ive never done a bottom end on one. My crank spun very easily when my top end was off. My bottom end is a year old. It was replaced right before I bought the bike (came from my GFs dad so I know its legit - and I have a wiseco crank and rod in ther cause the stocker siezed and got chewed up).

Anyway, good luck. Did you do what Kgibson said?

 

[joshrabbitt14]

Yeah thanks kgib i tapped both sides and it spins a little easier now

 

[OConnor Racing]

What tools did you use to assemble it? The crank needs to be pulled into the left side case. What you're feeling is side load on the mains.

 

[joshrabbitt14]

I used the tusk puller/installer and pulled it into the left side then used it on the other side to push the right case onto the left

 

[Little-J]

did you check the side clearance on the con rod bearing? if someone replaces the big end bearing and pin and doesnt get the clearance right, it makes the crank wider or narrower leading to this problem when you re assemble the cases.

its what oconnor said, and now that youve tapped it, its gotten a bit better.. this means your crank was made a bit narrow and spread when you installed it. nothing wrong with the tool tho, i use the same one..

or your cases needed a bit of lapping.

 

[joshrabbitt14]

Is this a problem though? Or should I run it? And it's a new vitos +3 stoker crank

 

[Kgibson]

if it spins easy run it....theres nothing wrong with it