high speed misfire

gday ,i have a high speed misfire at wot like its starving for fuel everywhere else is fine onle at full throttle under load its not the speed limiter,it sort of bogs down then picks up again and i cannot get any more than 70 kmh out of it ,im thinking efi pump any ideas? its a 09 700se with a jbs clutch,everthing else stk thanks,jason

First thing to check is your fuel presure, You shouid have 40-45 at idle, and no more than 3 psi drop at WOT.

does it have a cdi

no cdi its stk i changed fuel pump,no difference,

you can hold wot in neatral and it backfires and pops through induction ive worked on alot of these and cant seem to fix my own:scratch:

if your on stock CDI then your hitting the rev limiter more than likely because 70 kph is about 44mph. Thats where the stock rev limiter comes in at.

ok could be ,does the rev limiter sound like a 660 1? this pops,bangs,shuts down like its starving for fuel and i thought i might have got more top speed with the jbs sheave,it really struggles to hit the 70 kph and does the same thing wot tryin to climb hills not reaching 70kph,might need cdi? got 9 rhino buddies and they all have 660 that leave mine standin still thanks any ideas would be much appreciated

if the 660 is walking away from you it may not be the cdi. Did you get your sheave put in right? how many miles on the machine? How old is the belt? The CDI is going to stop you at 70 kph anyway so a CDI would be a good thing to look into regardless but if your machine isnt running right then I would attack that first. Im still leaning toward the CDI though. my 660 will run 83 kph with a sheave and cdi on stock 25" tires but before the sheave i stopped at 70 kph because of the rev limiter and it was MUCH higher RPM's when i was there

belt is new not sure on milege its had a new speedo fitted but ive been round them long enough to no its done a fair bit of work its not smokin seems to have a good tight motor if u hold it flat in neatral it seems to flaten out and pop back through intake not sure if its rev limiter or something wrong it just doesnt sound like rev limiter but could be what does urs do in neatral holding it flat?

ok whats a cdi worth and which 1 do i put in and whos got 1 ,how much sent to me i can pay with paypal thanks

205.00 shipped for the dynatek

If it's all stock and youve had it for some time, It might be a good idea to check your Cam timing.

cam timing spot on ,any 1 had injector problems?and im leaning twards stator,running out of options,james i will take the cdi i pay u as normal thanks

Sound like my problem . I'm interested in what you find out.

im waiting on cdi to see if that helps,ive put it in to hard basket for now,,,,,over it

my dealer gave me a cdi to try but that didn't work . I'm starting to think my wet clutch may be slipping and I'm hitting the rev limiter

Does it sound similar to this?

yes what was the problem

urs is deff rev limiter check ur sheave,or how long has it been since you been in ur clutch?mine actually backfires through intake alot more savage than that sounds,mine does it in gear or in neatral,urs an easy fix by listining to it thank for the reply,dont think any1 has any ideas about mine

Yes his sound like his is revving allot higher than mine to , mine backfires a little to . IDK. I took mine to a shop and they said it was in the clutch , Wet clutch slipping at wot and hitting rev limiter?

have ya'll put a A/F gauge on it to see what it is on top end

still havent found the problem,ive tried another cdi and coil still the same,has anyone seen what kind of pattern the injector sprays fuel when removed from rhino ,i took mine out and held it about 5 inches away from clean paper and it sprays 2 , 1 inch round spots about 2 inches apart but there is 4 holes in injector this is at cranking speed,im using about half a tank of fuel for around,40km seems to much,im leaning towards stator or injector any one?????

Make sure your air filter is clean.

stator will make them cut out..scottwv had that problem