1974 250 gearing

[auto]

I built a 74 250 and have a few questions.What gearing is most used,Are the trans ratios differant (closer) in a 1980 6 speed,different carb besides the bing and if so what air box boot would be used. It runs clean,just seems a bit lazy. Thanks

[JP Morgen]

Very difficult to install a Mikuni and get an air boot set up. Buy a new needle jet for the Bing, they wear out and it makes the mid range jetting rich. Do the Carl Cranke porting, it will not be doggy!

[Carl Hill]

I have a Bing on my 74 250 and it runs crisp and clean. They do wear quickly though as others have pointed out. My cylinder is stock, just matched up the ports. I have pulled quite a few holeshots with it. If yours feels slow I suspect you may have worn slide or needle.

[auto]

After searching the forum I found answers to my questions except the ratio question.Are the gear ratios different in a 1980 250 from my 1974 transmission.Any links to parts list?

[Mike Lenz]

I believe they are the same