rebuild of my 1976 B engine...finally (1 Viewer)

[mayben1001]

Hey all,
Been about 4 years since my last post.. Had a kid, and the old bj 40 quit working at the same time...
Finally getting around to it for a full rebuild...Got her stripped down and ready to go to the machine shop for a clean up and press in new sleeves, cylinders, etc. The quote was pretty high, between $2-3,000 but I think that was for installing everything in and balancing the motor etc. Anyone out there done a full rebuild... What are the benefits of balancing this particular motor? Any absolutely necessary improvements is what I am looking for. I want to rebuild it right, but also have to be able to afford it...
Thanks a bunch, good to see many of the same folks are still around and communicating about these rad little rigs.
cheers,
Mayben

 

[roscoFJ73]

but I think that was for installing everything in and balancing the motor etc.

I recommend you find out, get it in writing and know it off by heart.
You could get the machinist to check the balance of the main components, some of the F petrol engines were a long way out from the factory. But I don't think they rev high enough to need balancing beyond normal specs.
You should ask if the flywheel is included and what rebuild kit they are using. CYL head included?
Has a fuel pump and injector service been budgeted into the overall cost? Engine power is only as good as the efficiency of the fuel delivery.
The price depends on where you are.

 

[mayben1001]

thanks Roscofj73,
Good questions to ask the machinist, the rebuild kit I got is the full rebuild from Spectre off road in California. It includes new sleeves, cylinders, bearings, I bought a new camshaft, valve lifters, etc. He will use my existing cal head and magna flux it and recondition it unless it is cracked, but a new cyl head here is $1500...ouch. Hope mine is all good still. Got the injectors new from Australia just before the engine went bad so assuming they are still good. Not sure I was going to service the fuel pump. A little timid about opening that puppy up.
Any other thoughts...
Cheers,
Mayben

 

[cruizerbuddy]

Could you have the machine shop bench test the IP and such to ensure they are within tolerances? Think the FSM has pretty good instructions as i recall. But yeah im with Mayben, its a wee bit intimidatimg..

 

[roscoFJ73]

Could you have the machine shop bench test the IP and such to ensure they are within tolerances? Think the FSM has pretty good instructions as i recall. But yeah im with Mayben, its a wee bit intimidatimg..

Bench testing is the best thing to do, but I doubt a machinist will do it. Its a job for a specialist

 

[cruizerbuddy]

Oh ok.