intermitent High Rev

[buck119fa]

Ok, so I'm new to the forum and have been doing some searching here. Not quite finding what i need so....

2005 Blaster, all stock motor. On occasion not every start, this thing will rev extreamly high and won't come back down. and we have to shut it off. it will do it maybe 2 or three times and then it will run fine. does it mostly when cold. but not too often. now other times it runs like a champ, 2 kicks and its going with no issues, then one day it will do the high rev all over again. Thoughts? wanting to sell this but it needs to run right first without spending a bunch of money to get there.

 

[Awk08]

sounds like it could be a throttle/cable, or possibly carb slide sticking issue
or may also be an airleak

tear the carb off and completely disassemble for a good cleaning
and you should get a leak down tester to check for airleaks
contact slickerthanyou on here for a leak tester

 

[buck119fa]

thanks, i'll tear down the carb tonight and clean it up, first i'll check that cable. I'll post what happens with it.

 

[Awk08]

open the top of the throttle box to get a good lood at what that end of the cable is doing
but if your not hitting the throttle to start it, as you shouldnt have to do, chances are it's not the cable/carb slide

look into the intake with a flashlight while you have the carb off to see what the reeds look like

 

[Xero]

I work in a small quad shop (in the UK) one day a week just fixing stuff really.. we had a quad the same, took carb off cleaned it couple times to make sure, checked the cable (cable was the problem) but also followed the cable further down to where it meats oil pump thing had seized open, may be similar problem? so basically what awk said

 

[buck119fa]

ok, checked the throttle cable and it's working as it should, pulled the carb and have it torn down, waiting on the kit to come in. Reeds are clean. could the tors be the issue? I've read on here that it may be an issue. Should i just get the replacement kit and do this now or not? not real up on the 2 stroke.

 

[brandoz28]

the TORS won't make it rev out of control.


check over the intake boot really well to make sure there aren't any cracks in it.

Give that carb a good cleaning

 

[Larry's Shee]

Clean and lube cable, take both sides off of "brick" on top of carb, clean/lube in there.

 

[Blaaster]

the TORS won't make it rev out of control.


check over the intake boot really well to make sure there aren't any cracks in it.

Give that carb a good cleaning

I have had carb boots that pass a leak down test, but leak with a carb hanging on them, especially with vibration.

 

[buck119fa]

Ok, cleand the heck out of the carb and the tors, got it all back togeather and it really does run, with a little high rev issue. I can't get the idle down now. Adjusting the idle screw and it's bottomed out and still running high. I just readjusted the float (it was too high and dumping fuel out the overflow tube) readjusted the length of the pin (made it longer) where it attaches to the cable and down it to the carb (if that makes sense). Any other thoughts why I cant get the idle to adjust down? went thru the carb real good and cleand everything.....

 

[blasterdemon7]

Did you put the slide in the right way? Try taking it back out and install it with other way.

 

[buck119fa]

it only goes in one way, it's key'd on one side. but i did take this all back apart, readjusted that needle on the end of the throttle cable again. since i went up one notch and it went to a higer idle I took it back down 2. Now it wont idle so it looks like i'll put that back where i started at and tear down the carb again and see what i missed. still can't get the idle to adjust at all.

 

[buck119fa]

Well let see... tore this carb down again, recleaned and inspected everything all over. Found nothing out of place or dirty. Readjusted the pin on the cable down 1 groove and now it idles but it's still a bit high. I think i may need to go to the last groove on the pin but this is running better, took it out and it goes thru the gears well, no sputtering, seems smooth just need to get that idle down a bit more.
Any other thoughts on what may be going on here or am i missing someething to get this idle adjusted?

 

[brandoz28]

does it idle better with the choke pulled out?

have you done a leakdown test yet? just to rule out any air leaks...

 

[slickerthanyou]

Adjusting the needle isn't how u adjust the idle. There is an idle adjust on top of the silver box (tors) that u should be using to adjust idle, put the needle on middle (third) clip and use the idle screw about the size of a dime on top of the box to adjust idle!

 

[buck119fa]

Adjusting the needle isn't how u adjust the idle. There is an idle adjust on top of the silver box (tors) that u should be using to adjust idle, put the needle on middle (third) clip and use the idle screw about the size of a dime on top of the box to adjust idle!

Did that first, no go. moving the needle was the only thing that worked to bring it down (1 clip down from the middle). the more i read and search the more it sounds like I need to replace the tors or get the kit for it.

 

[StrokedTater244]

readjusted the length of the pin (made it longer) where it attaches to the cable and down it to the carb (if that makes sense).

this a big mistake. that changes the mixture of the air/fuel ratio. you made it very lean,(too much air, not enough fuel). this will cause your engine to burn up. like said already, put this back to the middle position before you run it anymore. and good luck figuring out the idel problem, chances are the super lean needle^^^^^ may be the only thing wrong now.

 

[StrokedTater244]

Did that first, no go. moving the needle was the only thing that worked to bring it down (1 clip down from the middle). the more i read and search the more it sounds like I need to replace the tors or get the kit for it.

oh so you moved the clip down a notch, well that made it richer. a stockish engine needs to be in the middle. i would bet the richer jetting is masking an airleak.

 

[buck119fa]

thanks for the advice, I'll move that back to the middle tomorrow and check for air leaks. I've just got to be missing something here.

 

[brandoz28]

leakdown test it before riding any more