Help needed. Building an RB250 for a mate

[Supereibar]

Hello peeps, I have a friend who has provided an engine, an RB250 kit, a high performance crank, a 6 plate clutch, a 34mm delly, a varitronic elec. ign. kit and is now just waiting to have all the elements that I ask him for to ship the whole thing to me to do the build up.

My question is, I've heard horror stories about the RB kits and really dont know what to tell this guy as far as modifications to make his kit reliable, what would you reccomend as far as the crank goes? Is the high performance crank safe after its trued or does it need to be modified/machined? Would it be a better idea to replace the con rod for an RD400 one? How about the piston? Any suggestions for the whole front end set up?

Many thanks in advance. I need all the help I can get so all comments are welcome!!!

Jaime

[RICSPEED]

go to the lam tech page and try a search ...there should be a few threads on this subject jaime

[Supereibar]

Nothing... C'mon!! Where are the tuning boys?????

[camel]

well firstly....what crank have you got?

[rocho68]

just built one for a mate , what crank you using ? , also be careful as weve had trouble with the af flywheel breaking down at top revs , make sure you replace everything and dont skimp on nothing else it will come apart like a cheap watch ........................

[Supereibar]

You guys are totally right and I do have clear that we are starting with a bare casing. From that point on is all welding, then machining and C4 bearings. Vitton seals any good?

My mate hasnt specified on the crank, but aparently is a high performance crank, also produced by AF. Any idea on how these cranks are made?

Many thanks for your comments!

Jaime

[Lamaddict]

Lubrication on the big end was a greater requirement for the RB's, so I'd expect to see the conrod big end have big grooves cut in for better lubrication. Personally I like Yam rods on SIL webs but don't know if anyone has tried one on an RB.

[Supereibar]

Cutting grooves inside the conrod big end????

[RICSPEED]

Cutting grooves inside the conrod big end????

a bigger slot cut in the end :smug: :bouncing: :fb:

[Supereibar]

you reckon?