engine problem


8 replies to this topic
  • stlhooked

Posted September 18, 2011 - 09:31 AM

#1

Bike is hesitating when trying to maintain a steady speed. It runs fine at idle or gaining speed... Any suggestions??? It's and 08 450 by the way...

  • MANIAC998

Posted September 20, 2011 - 01:58 AM

#2

Some say it's the TPS on the carb. You can try unhooking it to see if it lessens or goes away. Do a search and you should come up with some good info. Maniac

  • GuyGraham

Posted September 20, 2011 - 03:47 AM

#3

bike isn't designed to hold steady speed

Mine stutters when trying to crusie

just ride it either or off the throttle

  • dgcars

Posted September 20, 2011 - 04:30 AM

#4

As has been said....disconnect the TPS and ride again.
Try a richer needle (1/8 - 1/4 throttle)

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  • stlhooked

Posted September 21, 2011 - 05:49 AM

#5

It used to only shutter a little bit with choke off and would run fine with the choke on. But yesterday I rode it (after putting 105 miles on it the day before) and now with the choke one it still rides good but idled very high at stop lights...
I'll try the afore mentioned fix...

  • tribalbc

Posted September 21, 2011 - 07:37 AM

#6

I only get a low RPM steady throttle stutter when I am rich on the fuel srew/ pilot.

  • CanadianWR450

Posted September 23, 2011 - 05:03 AM

#7

I only get a low RPM steady throttle stutter when I am rich on the fuel srew/ pilot.


Mine is the opposite. Now that I have it DS'd if I notice a stutter on road (It NEVER stutters offroad), I turn out the fuel screw 1/4 turn or less, and usually almost eliminates it.

Either way, as previously mentioned, on my bike the most minuscule of throttle input eliminates it.

  • GCannon

Posted September 23, 2011 - 09:06 AM

#8

Mine is the opposite. Now that I have it DS'd if I notice a stutter on road (It NEVER stutters offroad), I turn out the fuel screw 1/4 turn or less, and usually almost eliminates it.

Either way, as previously mentioned, on my bike the most minuscule of throttle input eliminates it.


Me too.

My fix was to adjust the TPS with a lab scope (or graphing multimeter) to the high end of the closed throttle voltage range (with engine running and back probing the TPS wires, TPS connected)which is in the manual (.72-.73 volts) you should set your idle perfect before you adjust the TPS.

Then I raised my needle one slot.

Now it is barely detectable at 1/4 steady throttle on the pavement.

  • stlhooked

Posted September 23, 2011 - 09:27 AM

#9

I think it might also be the pilot since it has sat for a while before I bought it... I put some fuel tank cleaner in there and road it for about 105 miles which is when it started running worse..
But I think I might pay the local shop $160 to take the Carb off clean it and install a new adjustable fuel screw while its off....
This stuff sounds to complicated and foreign to me.




 
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