Interesting... I'll look for that guide.Just double checked and it says Mikcarb vm28. I think the jets I ordered are the size you recommend, so that's cool. There are 2 external adjusters. One thumbscrew which seems to only restrict how far the slide can go down, and a phillips screw which I assume is mixture. So to adjust for elevation, I need to adjust the phillips screw?I thought the filter had been moved because the toolbox appears to be designed to hold an air filter. The previous owner must have swapped that toolbox in then. Does anyone know of a free flowing filter that will fit into that rectangular box? I like the filter being in there (out of sight, plus I like the look of the box).
The air screw will only change the mixture at really low RPM (idle) when the pilot jet is active; the jet needle (size/position) and main jet are going to control mix as the venturi opens up. So there's no one-stop shop for adjusting across the board.Does the Mikarb vm28 also have an interchangeable needle jet? (The Mikarb vm24 does not, just main and pilot, and that's all I've used.)Ace, how do you feel about CV carbs in a performance application? I might experiement with one on my bike when I'm back in the US, since riding in the mountains is my favorite thing to do... Would probably be willing to sacrifice a tad of crispness at the throttle for a proper mix at all elevations. Any recommendations on one I might try to replace the standard Fireball 34mm flatslide?
For small changes in elevation, the pilot screw will help to correct starting and idling adjustments.However, for any larger elevation changes all the jets must be changed to keep correct mixture. Obviously, most people do not do this, and they simply run the bike rich at higher elevations, so that when they come back down to lower elevations, they are okay. As long as you don't bog down or foul plugs during the ride, I suppose that's acceptable. You are going to lose power at elevation anyway, and your compression will be lower, and your timing will be off too, so you just deal with it as best you can.At 10,000 feet, you'll be lucky to have half the power the bike is supposed to have.
The Royal Enfield AVL-engined bikes are equipped standard with a clone of the BS29.Check in the AVL forum with the Electra X owners.