engine races

jesmed · Post by **jesmed** » Tue Jun 20, 2006 9:37 pm

Steve, I'm pretty sure the idle circuit is clear. I've removed the idle jet and sprayed cleaner down the idle air passage and it comes out freely at the jet. I've also checked the tiny hole in the carb body where the idle air/fuel mix gets sucked into the carb. And if the idle circuit was plugged up, adjusting the idle air mix screw would have no effect, right? Little or no air would be getting through regardless of the screw setting. But since shutting down the idle air screw actually reduces the "racing" effect, it suggests to me that air is leaking through elsewhere, and reducing the airflow through the idle circuit partially compensates.

It's good to hear you've never heard of a "leaky" slide, so maybe I don't need a new carb, but danged if I know where the "extra" air is leaking through. ---Jesse

jesmed · Post by **jesmed** » Tue Jun 20, 2006 9:41 pm

Joe, I have new O-rings and have double-checked the flange and head surfaces, as well as the insulator, but since I'm at a total loss I'll go ahead and try the spray trick and see what happens. Thanks for the tip. ---Jesse

LOUD MOUSE · Post by **LOUD MOUSE** » Wed Jun 21, 2006 2:55 pm

Your carbs are not set equal with the slide screws. This causes one carb to Over Reve the engine for a moment until both carbs drop into the idle circuit. ........lm

jesmed wrote:Joe, I have new O-rings and have double-checked the flange and head surfaces, as well as the insulator, but since I'm at a total loss I'll go ahead and try the spray trick and see what happens. Thanks for the tip. ---Jesse

LOUD MOUSE · Post by **LOUD MOUSE** » Wed Jun 21, 2006 2:56 pm

Your carbs are not set equal with the slide screws. This causes one carb to Over Reve the engine for a moment until both carbs drop into the idle circuit. ........lm

jesmed wrote:Joe, I have new O-rings and have double-checked the flange and head surfaces, as well as the insulator, but since I'm at a total loss I'll go ahead and try the spray trick and see what happens. Thanks for the tip. ---Jesse

jesmed · Post by **jesmed** » Wed Jun 21, 2006 5:57 pm

LM, good thought. I backed off the left idle adjust screw so the slide bottoms out in the carb bore at idle. With the idle air mixture screw set at 1/4 turn out (any farther out causes backfire), this does help the engine rev down between shifts, but I think it's still a little slow to de-rev.

So I've compensated by bottoming out the slide at idle, and practically shutting down the idle air circuit. But the question remains, what is the root problem that I'm having to compensate for? I still see the only logical answer being that air is leaking around the slide. ---Jesse

LOUD MOUSE · Post by **LOUD MOUSE** » Wed Jun 21, 2006 6:31 pm

So now you know that that carb isn't the High Idle one and now wiith out the engine running bottom the slow screws. open 1 1/2 turns. start the engine and go letf/right UP/DOWN witj the slide screws.
Took me a couple of years to get this down but if I can so cqan others. ...........lm

jesmed wrote:LM, good thought. I backed off the left idle adjust screw so the slide bottoms out in the carb bore at idle. With the idle air mixture screw set at 1/4 turn out (any farther out causes backfire), this does help the engine rev down between shifts, but I think it's still a little slow to de-rev.

So I've compensated by bottoming out the slide at idle, and practically shutting down the idle air circuit. But the question remains, what is the root problem that I'm having to compensate for? I still see the only logical answer being that air is leaking around the slide. ---Jesse

jesmed · Post by **jesmed** » Wed Jun 21, 2006 7:27 pm

LM, well, this is more fun than a barrel of monkeys! I can see why it took you a couple of years to figure out. I'll follow your advice tomorrow and let you know what happens...Jesse

PS--is your wisdom on this subject (balancing carb idle settings) written anywhere, like in a manual? I have Bill Silver's CD and used it to rebuild my engine and learn about these bikes as a newbie, but I don't recall reading anything about this particular barrel of monkeys. Would've been good to know about it before I fell into it.