Help!!!! My 450r

[cincy250R]

ok i rode it all day ran flawlessy then i cased a triple pretty bad and when i turned off the track my quad wouldn't rev at all it kinda sounds like it's hitting the rev limiter at really low RPM and now when ever i get on the gas it starts missing and having a fit i kinda think it's the Cdi box but i don't have a way too test so then i took the Carb off too make sure the float wasn't stuck or that any of the Jets weren't clogged so now i'm out of ideas is anyone else having a similar problem????

Thanks
-Dave

[cincy250R]

nothing......


-dave

[atvridernc]

sounds like something in the carb to me.

is your slide working fine?

[brocket99]

could be your needle retaining clip

[gbcap]

did you check all the boots from the air box to the motor? mine have come off on ruff landings and it doesn't let the bike run right. spits and sputters?

[crablaster]

i would look around the air box and carb sounds like maybee to much air maybee something may have poped offor came loose

[cincy250R]

i'll double check all that i hope i can figure it out

Thanks
-Dave

[Johnny B]

the same problem happened to me. i was climbing a hill when the the thottle just stoped working. lucky for me i was at the top of the hill. anyway, the problem was that the 2 tiny screws that hold the slide arm on came loose, and the slide would not open. just take the top carb plate off and check er out.

[ThumPIN_450R]

I have snapped the upper subframe bolts and knocked the carb off you may check that.

[YamaWarr0121]

if you have stock electricals its probably 80% electrical. Carb componets move around, but electricals come apart verrryy easily.

[cincy250R]

alright here's where i'm at i checked the carb and nothing is loose and the slide and butterfly valve appear too be working fine and i also took all the plastics off checked every connection traced every wire and it is still doing it......it sounds like it is hitting the rev limiter at like half throttle.....:(

-Dave

[YamaWarr0121]

now i'm new to 450R's but in that case on my yfz it was the stator..

so something resembling that mechanism on the 450R could be it..

[GEARSMOKER]

same exact problem happened to me.found a poppy sized piece of debris in the carb and replaced the cdi box.not sure which one it was,but it now works fine.

[TMSmx47]

What year is the bike? I have a 04 and this may sound a little off the wall to you, but I had the EXACT same problem. I went over and over and over everything. I bought a brand new CDI, New carb, Filter, drained the gas, changed my whole wire harness.. EVERYTHING you can imagine. Nothin.. then last but not least since it seemed like a timing problem I checked the cam timing. Sure enough my cam chain had jumped timing a tooth and made that much of a difference. Take the valve cover off and the big allen key nut off on the right side of your bike like shown in that crappy pic..lol. First line up the timing mark on that side of the bike. You will see like a dot on the flywheel that will line up with the little arrow casting on your case. Once those line up then go and check the cam marks. They should be straight across with the intake lobs on the cam pointing towards the back of the motor. It happen to me so it can happen to you..lol! Def let me know if that was the problem. If so, your welcome, if not I dont know what else man

[Villageidiott23]

holy crap, your cam chain jumped a tooth, haha what the hell are you jumping or was it a crash....?????

[TMSmx47]

little short on a 90ft triple like him.. But it happened so thats why i warned him!

[cincy250R]

damn thanks i didn't even think of that but i'll try it i'm running out ideas i'll keep you guys posted on what happens

-Dave

[Duke450r]

You may have already done this....if not, check the air filter, we have had them come off on hard landings a couple of times, and they generally run like junk when it happens

[cLogan]

im still kinda new to 450r's but a buddy of mines banshee had the same prob and it turned out to be the ebreak was on but was not so it was retarding the motor to keep from burning the breaks up not sure if the r's do this i have not tried on mine

[Johnny B]

i was having simmilar troubles with my 300ex before i got the 450 but it did the same thing. i checked over EVERYTHING and nothing seemed to work so i said screw it and put new rings in it and bingo she worked like a charm. or like TMSmx47 said i could be timing. the only funny thing was that my 300 dident smoke or anything. maby that was just the timing too. never did check that until i had to line it up to put it back together.

[cincy250R]

everyone we have a winner it was a tooth off now iot runs like a champ again thanks everyone

-Dave

[cLogan]

thats a pretty extreme landing to skip a tooth

[TMSmx47]

it sounds to me like TMSmx47 is the chit huh!! Im sorry, just wanted to make myself feel good!!! lol.. your welcome anyway Dave! Glad your back in business!

[Johnny B]

Originally posted by TMSmx47
it sounds to me like TMSmx47 is the chit huh!! Im sorry, just wanted to make myself feel good!!! lol.. your welcome anyway Dave! Glad your back in business!

Your a good man!

[cincy250R]

i was getting ready too buy a new CDi and a jet kit just too see if that would fix it but damn i would never thought too look at the timing thank god i posted that up here or else i don't think i would have ever found it

[morfy]

You have a buddy with a 450r??? If you do take his cdi off his bike so as you can rule that one out....

[TMSmx47]

Hey morfy, thanks for the input... bike is fixed and he's prob out ridin now!!! I found with CDI's.. they either work or they dont, just my experience.

[GEARSMOKER]

a cdi can heat up and change resistance,which in turn will make the voltage run through it at a differant pace,thus making the motor (or whatever the cdi is controlling) run differently.