carb adjustment?

[co.dime]

just got me a 1972 510 2 door, 52k org. miles, with dual side draft mikuni carbs. on a l20b with 2k miles, the guy i got it from said he adjusted it for the elvation he was at, which is like 6500-7500 feet. now im down to 5500 or so is it going to make a big diff. i dont get it tuned for here? and anybody know the redline on that engine? anybody know a good place around colorado springs that can work on the car and not screw it up?

[ggzilla]

It should be OK -- that's only a 1000-2000 foot difference. Well within operating tolerance.

[co.dime]

It should be OK -- that's only a 1000-2000 foot difference. Well within operating tolerance.

 

ok thanks. if i change the exhaust whill i need to change anything on the carbs? i dont know much about carbs yet.

[ggzilla]

If you change the exhaust radically, it might be worthwhile to rejet the carbs. Like going from 2" exhaust to 3" or fitting tubular headers instead of a factory exhaust manifold. But generally it will still run OK.

 

Just changing the muffler to a lower flow type won't require rejetting the carburetors.

[datzenmike]

Redline on an L20B I would say 6-6.5K reliably. You can go higher than that and it won't blow up but it will shorten the life.

 

Carbs tend to get richer with altitude increase and leaner with decrease. I doubt it will affect it that much but if it runs hotter or the plugs are white (a good indication of a lean mixture) then maybe time for a change. Plus you don't know exactly how accurate his changes in jets were to begin with. He may have gone lean making yours worse.