Rd250/R5 hybrids

[Greaser Greg]

What are the advantages and drawbacks of mixing these motors/transmissions for street applications?  Will pipes that are tuned for a 250 work on R5's?

[m in sc]

Pipes will work.

what exactly are you asking about? rd250 bottom and r5 top or other way around? clarify.  6 speed trans is always better in my opinion though. I always look for 6th on my r5.

[Greaser Greg]

Yes,  r5 top on rd250 bottom. So more gears and a quicker primary ratio?
How much power do the reed valves add to the smaller displacement engine as stock? Anywhere close to the r5?

[m in sc]

rd250 isnt a far cry from the 350 power wise.  if you have a complete r250 motor, just install it.  It just sort of depends what exactly you want? r5 with a 6 seed tranny and 350 primary gearing is fun. however, you should use the 250 oil pump and gear if you plan on keeping the primary gearing as 250.

[Greaser Greg]

Hmm, food for thought. Thanks!
Now, on to my next post over yonder.