OS lower W/different powerhead

[topfuel443]

Has anyone out there used the OS lower unit with another powerhead???? ??? Like the k&B with a CMB or Nova Rossi/Rossi. Ive run the stock OS for two seasons without the first problem or cable breaking. I hear evryone talking about K&B flex shafts breaking, why not use OS. Is there any engine that will work :-

Im sure the OS lower is more expensive, but if its better, it makes sense.

~ James

 

[Jerry Dunlap]

James,

I've never seen anyone attach a different powerhead to an O.S. Max 21 lower unit. The most obvious reason is the mounting face for the O.S. lower unit does not match any other motor.

I supose some type of adaptor plate could be made. But, then you'd need to have special cables made becase the adaptor plate would create a space between the lower unit and the power head.

If you've never broken a cable on an OS OB, you've sure had better luck than me. I have broken a few OS cables.

Jerry D.

 

[osracer]

I have been running an OS for three years now and I am still on the same shaft. I run at least twelve sanctioned races a year with it plus test time so it gets a lot of use. If I could get the piston and liner to last as long as the drive cable it would be a winner. I have also looked at converting it to a different power head and I think it could be done but you would have to machine a new PTO housing to make it happen. Jerry, I don't know what you are using to lube the shaft but here is what I am doing. I use a Lawless shaft and instead of using the muffler to lube it I just put a piece of fuel tubing at the top inlet and bottom inlet and shoot STP into it between races. The first shaft I got from OS lasted one run using the muffler lubrication system.

 

[josephlai]

Hi there,

Maybe we can get the idea of converting Nova Rossi inboard to outboard by changing its crankshaft. Thus, we can get the existing OS .21 engine, e.g. RZ-M, VZ-M which is much powerful then the existing power head will be a easier solution.

Have a good day. ;D

 

[topfuel443]

osracer, I do the same thing with the cable lube. I have a hose going from the original inlet for the muffler luberto the lower inlet. I use the hose as a fill tube to lube the cable. Although I used the muffler lube system for about a year with no problems, and still use the same cable that came with the engine without a hitch.

I think with the OS mounting plate being Big you could mount another power head to it by making new holes if need be ..... just gottat find a different powerhead now to try it with ................MAC???? ;D ;D