BushyAR15
Fri Jul 19th, 2013, 04:42 PM
The continuing saga of restoring my '98 YZF750R...
Did a search on this forum and saw/read some helpful information. I initially thought it might be an overly rich condition, but reading through some of those posts it sounds like the carbs can be tuned too lean on the bottom to too rich on top so it needs an entire tune.
The bike is running pretty good. However, the carbs need to be rejetted (tuned) due to our altitude. What I notice is if the bike idles for a long period of time the carbs load up. So taking off from a light the bike is very slow to move until the carbs clear up. Seems holding the throttle at 1/4 throttle open and above it runs fine. Seems to only be an issue of loading up when idling. If I roll on the throttle after it is has cleared the loading up meaning quick and steady roll on to WFO, it runs pretty good.
So what I'd like to do get rid of that initial bog.
Its been years since I worked on carbs and I've forgotten some of it. I'm thinking it might be the pilots and/or the air screw mixtures? Not the mains or the needles since it seems to go well when rolling on the throttle?
Wondering if I should pick up a dynojet stage 1-3 kit and fit that... But I remember playing with those, they usually have you drill out things, replace the main jets, replace the needles, on and on. I guess I'm wondering if I should get the Dynojet kit but concerned its just going to cause more work issues, than trying to figure out the low-end/idle bog...
Thoughts?
Did a search on this forum and saw/read some helpful information. I initially thought it might be an overly rich condition, but reading through some of those posts it sounds like the carbs can be tuned too lean on the bottom to too rich on top so it needs an entire tune.
The bike is running pretty good. However, the carbs need to be rejetted (tuned) due to our altitude. What I notice is if the bike idles for a long period of time the carbs load up. So taking off from a light the bike is very slow to move until the carbs clear up. Seems holding the throttle at 1/4 throttle open and above it runs fine. Seems to only be an issue of loading up when idling. If I roll on the throttle after it is has cleared the loading up meaning quick and steady roll on to WFO, it runs pretty good.
So what I'd like to do get rid of that initial bog.
Its been years since I worked on carbs and I've forgotten some of it. I'm thinking it might be the pilots and/or the air screw mixtures? Not the mains or the needles since it seems to go well when rolling on the throttle?
Wondering if I should pick up a dynojet stage 1-3 kit and fit that... But I remember playing with those, they usually have you drill out things, replace the main jets, replace the needles, on and on. I guess I'm wondering if I should get the Dynojet kit but concerned its just going to cause more work issues, than trying to figure out the low-end/idle bog...
Thoughts?