Post by exrallydave on Oct 25, 2015 22:21:04 GMT -6
Hello all-
I recently bought a slightly abused and re assembled 2006 "Bandit UC250z", with the Linhai 170mm style engine.
Scoot was running rich when I test rode it, previous owner had three sooty plugs to go with it.
I get it home, de plastic it, find no bloody air cleaner. No tube, nuthing. Arrgh!
Do the double oil change, watch valve cover vent tube for blowby, virtually zilch.
After a decent carb clean, (couldn't read pilot jet size clearly, 35/38 I think, main is 132) add a cone K&N, elbow, tube, etc, we go for an extended spin.
Runs pretty well, but has a hesitation off of idle, like 15-20mph. Pulls ok, but acts like its starving past 50 ish on wot.
Put new chino mikuni style fuel pump, diaphragm was leaking into vacuum side on origional. (Might have accounted for some of the richness and doggy top end meybe?)
Another ride, hesitation off idle much better, top end pull still lacking.
Ok, so I pull carb, drill pilot to 40, main to 140, ride more,
Slow speed hesitation a bit worse, ( I know, never change two things at once. Impatience can be costly) but wot much much better. Very happy at 55-60, pulls strongly all the way up.
Sooo, after this ramble, my question is this.
What would you "guess" the pilot and msin should be, only mods being the intake. Exhaust bone stock.
Side not, I've installed an exhaust gas temp gauge (gotta love fleabay sometimes!)
Will report back on idle and hard pull temps once the longer lead thermocouple gets here.
Thanks for the time, folks, Ive enjoyed just lurking the last two weeks.
Dave
I recently bought a slightly abused and re assembled 2006 "Bandit UC250z", with the Linhai 170mm style engine.
Scoot was running rich when I test rode it, previous owner had three sooty plugs to go with it.
I get it home, de plastic it, find no bloody air cleaner. No tube, nuthing. Arrgh!
Do the double oil change, watch valve cover vent tube for blowby, virtually zilch.
After a decent carb clean, (couldn't read pilot jet size clearly, 35/38 I think, main is 132) add a cone K&N, elbow, tube, etc, we go for an extended spin.
Runs pretty well, but has a hesitation off of idle, like 15-20mph. Pulls ok, but acts like its starving past 50 ish on wot.
Put new chino mikuni style fuel pump, diaphragm was leaking into vacuum side on origional. (Might have accounted for some of the richness and doggy top end meybe?)
Another ride, hesitation off idle much better, top end pull still lacking.
Ok, so I pull carb, drill pilot to 40, main to 140, ride more,
Slow speed hesitation a bit worse, ( I know, never change two things at once. Impatience can be costly) but wot much much better. Very happy at 55-60, pulls strongly all the way up.
Sooo, after this ramble, my question is this.
What would you "guess" the pilot and msin should be, only mods being the intake. Exhaust bone stock.
Side not, I've installed an exhaust gas temp gauge (gotta love fleabay sometimes!)
Will report back on idle and hard pull temps once the longer lead thermocouple gets here.
Thanks for the time, folks, Ive enjoyed just lurking the last two weeks.
Dave
