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View Full Version : reving at 5000rpm when starting..help


blueicemanbird
06-30-2009, 03:56 PM
thanks to the help re the ignition coils i have now managed to get this zl400 to start..BUT...she revs at around 5000rpm when started, the choke is off..idle is set to minimum..(butterflies are closed at this setting) does anyone know why the high revs, i shut it down after 2 seconds. no air box or filter came with bike...so nothing fiited as yet!
i believe bike hadnt run for around 18mths..before i got hold of it on monday
help!!!! :help:...what should i try next
Jarney
06-30-2009, 06:07 PM
Check throttle and cables? Make sure the cables aren't adjusted real tight and throttle is working? Check below carbs and make sure nothing is keeping the throttle assembly from fully returning? Check the simple stuff first. Not sure what else would cause this. Later.
blueicemanbird
06-30-2009, 06:38 PM
yeah done all that.. originally assumed it was the throttle stuck open, or idle set too high..but that doesnt appear to be the case... must have too much fuel going thru thou to rev like that
zlMark
06-30-2009, 06:52 PM
choke is stuck open or bad
blueicemanbird
06-30-2009, 08:54 PM
its gotta be the carbs then? nothing else it can be.. is there?
will re check carbs tomorrow, but pretty sure choke on carbs was not open!
may consider getting carbs checked professionally if i cant sort it...£££££
zlMark
06-30-2009, 09:51 PM
Where else would it be getting air and fuel? Fuel tap diaphram bad??
golddrakul
06-30-2009, 10:10 PM
Does the 400 use the same choke/enrichener that the 900 does? If so, is there a way to check the inner workings of that without disassembling the carbs?
zlMark
07-01-2009, 06:09 AM
I beleive it does. The only way to check is to visually inspect. I would make sure the choke rail is engaging the plungers on all carbs and see if they are all shutting. Maybe the cable is holding them open
blueicemanbird
07-01-2009, 07:22 PM
carbs again removed and cleaned... noticed that one of the butterflie valves doesnt shut 100%... choke plunger.. opens and closes ok. have yet to refit and try as battery is now on charge!
blueicemanbird
07-05-2009, 07:33 PM
YEP .. sorted out the one butterfly
valve and she works... just goota get a air box for the carbs or fit k&n now