Stumped


16 replies to this topic
  • 2359cliff

Posted June 17, 2013 - 03:33 AM

#1

I have a miss towards the top end of the rev-range,I've tried ,plug,coil,kill switch,carb( replaced),air filter,valve clearances ,(spot on)all electrical connection cleaned,still no joy,any suggestions gratefully received ,

  • 2359cliff

Posted June 17, 2013 - 04:00 AM

#2

Sorry should have said bike is a 2011 450

  • Krannie McKranface

Posted June 17, 2013 - 05:13 AM

#3

Are you sure you are not just hitting the rev limiter?

  • 2359cliff

Posted June 17, 2013 - 06:05 AM

#4

No it's not the limiter, I've read around some more on the forum and it has been described by others as missing as you roll the throttle on or off at cruising speed,but when I say I've tried so many jetting scenarios ,I really have,have gone back to standard and started over,and I am currently running on a KTM (SPIT) carb jetted to suit as I found the seal on the slide on my carb had expired,am waiting for parts to come,have also tried disconnecting TPS,

  • n16ht5

Posted June 17, 2013 - 07:03 AM

#5

possibly too rich. try freeing the ehxhaust and intake for a run to see if it clears it.

  • zombiekillr.45

Posted June 17, 2013 - 07:16 AM

#6

check fuel filter ;)

  • 2359cliff

Posted June 17, 2013 - 10:15 AM

#7

possibly too rich. try freeing the ehxhaust and intake for a run to see if it clears it.

Sorry for being thick when you say freeing the exhaust and in let do you mean increase the gap????

  • 2359cliff

Posted June 17, 2013 - 10:17 AM

#8

check fuel filter ;)

. I have run the bike on a small test tank,same problem,thanks for the reply

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  • 2359cliff

Posted June 17, 2013 - 10:20 AM

#9

Also noticed when running the bike with no rear subframe and air box we could see fuel mist exiting the rear of the carb, as the bike spluttered , is why I went for valve clearances

  • grayracer513

Posted June 17, 2013 - 11:10 AM

#10

You know that when running the bike in neutral, the rev limit is lowered to 6500-7000?

  • n16ht5

Posted June 17, 2013 - 11:49 AM

#11

Sorry for being thick when you say freeing the exhaust and in let do you mean increase the gap????


???

Pull out any spark arrestors, quiet tips, etc.. from exhaust pipe. free up the flow. let bike breathe. or just try going down a main jet size

  • 2359cliff

Posted June 18, 2013 - 05:03 AM

#12

Would low compression cause these symptoms ?????? Next step leak down test! Have been using the bike for the past 18 months doing enduros,motoduros,rally's and some h&h about 3500 miles would this normally need a piston and or rings??????

  • Krannie McKranface

Posted June 18, 2013 - 05:22 AM

#13

Would low compression cause these symptoms ?????? Next step leak down test! Have been using the bike for the past 18 months doing enduros,motoduros,rally's and some h&h about 3500 miles would this normally need a piston and or rings??????


YES

  • n16ht5

Posted June 18, 2013 - 07:12 AM

#14

Would low compression cause these symptoms ?????? Next step leak down test! Have been using the bike for the past 18 months doing enduros,motoduros,rally's and some h&h about 3500 miles would this normally need a piston and or rings??????


omg... lol

  • Krannie McKranface

Posted June 18, 2013 - 05:40 PM

#15

...top for a top end, timing chain, chain tensioner, valve adjustment.
Do a leak down test if you think the valves are leaking, but not a common Wr issue.

  • 2359cliff

Posted June 24, 2013 - 09:56 AM

#16

Ok leak down test done,all good,going down the stator route ,have managed to find a high output stator so I'm awaiting its arrival,any other thoughts would be welcome, the internals of the engine itself showed no signs of wear,

  • n16ht5

Posted June 25, 2013 - 08:13 AM

#17

did you do a WFO chop plug test?




 
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