Nitro Star F4.1 bearing replacement

[xsavage3148]

Does anyone know what size and type of bearings i will need to order to replace all the bearings in my motor?

 

[HopIt]

No sorry, I tried to look them up for ya, but the bearings are not listed seperately. You'd be better off talking directly to HPI.

 

[xsavage3148]

yeah i tried looking it up too but the manual doesnt even say the size.

 

[HopIt]

That's because they just want you to go out and buy the crank case complete with bearings, instead of shopping for the individual bearings at a faction of the cost ! It's all to do with ripping off the unsuspecting customer !!

 

[Larsenracing]

You will want one of these NSK 607ZZ. It is 7X19X6MM.

Something like these.

http://www.vxb.com/page/bearings/PROD/Kit7462?gclid=CK_p4-bdzJMCFRQYsgod_wjfhA

My suggestion is to take one of the seals out using a pick, Then use some break clean or something and clean all the grease out. Then use some ARO with a few drops into it and place it into the engine with the side with the seal tored the outside. This will reduce friction allowing it to rev faster and hold power better. The oil in the fuel is also used to lubricate the bearing. There is a port that directs this oil to the bearing. The seals in the engine aren't meant to be the front engine seal as the engine uses tight tolerances and oil buildup along with RPM's to create a seal. Sounds funny but its true.

 

[xsavage3148]

i need two of those right or is one side a different size or not replaceable?

 

[Larsenracing]

There is only 2 bearings in the engine. The front one and there is one in the center however it is a different size bearing. There are no bearings at the rear or pistons side of the engine. The only bearing there is the One Way Bearing which takes no load other than for starting.

I don't recall the size of the center bearing off the top of my head as I have never replaced them. They have no seals in them though.