2003 txt pro sticky throttle.

[Donaldw]

Hi

You have probably heard this before but my 2003 txt pro 300 is starting, running and riding ok but every now and again usually at the wrong moment the throttle sticks, a quick blip of the throttle usually clears it. The cable doesn't seem to be snagging on anything, only thing I have noticed is I took the slide out and it is worn an both corners of the rounded side. Will this be causing the sticky throttle. Thanks in advance if anyone has any ideas.

[lineaway]

 What carb is on the bike?

[Tr1AL]

@DonaldwSome times the rubber throttle grip moves toward the housing and can rub on the black plastic housing that the tube turns in , there should be a large plastic washer that sits in between the grip and the housing to help prevent  friction. check that there is a gap of about 2 or 3mm between the grip and the housing and if you have bar ends fitted make sure there is a gap between the grip end and throttle tube end so that it does not drag against the bar end protector. IAnother thing that may cause a sticky throttle is accumulated gunge between the throttle tube and the actual handle bar , a thorough clean of the bar and the inside of the throttle tube with something like brake cleaner will help and as a lubricant  between them silicone grease , graphite powder or WD40 makes a dry PTFE lubricant spray. If you have a lot of scoring marks from trapped grit on the bar or the inside of the  tube then it is best to get rid of as much as you can using wet and dry where you can. As regards your worn throttle slide yes it will cause problems but this can be countered by changing your throttle spring for a heavier spring to help the slide return along with regularly applying a little PTFE lubricant in the slide bore or if you are not on a budget just buy a new throttle slide or complete carburettor of course.

Edited October 2, 2023 by Tr1AL
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[Donaldw]

16 hours ago, lineaway said:

 What carb is on the bike?

It's a kiehin pwk 28mm

[Donaldw]

13 hours ago, Tr1AL said:

@DonaldwSome times the rubber throttle grip moves toward the housing and can rub on the black plastic housing that the tube turns in , there should be a large plastic washer that sits in between the grip and the housing to help prevent  friction. check that there is a gap of about 2 or 3mm between the grip and the housing and if you have bar ends fitted make sure there is a gap between the grip end and throttle tube end so that it does not drag against the bar end protector. IAnother thing that may cause a sticky throttle is accumulated gunge between the throttle tube and the actual handle bar , a thorough clean of the bar and the inside of the throttle tube with something like brake cleaner will help and as a lubricant  between them silicone grease , graphite powder or WD40 makes a dry PTFE lubricant spray. If you have a lot of scoring marks from trapped grit on the bar or the inside of the  tube then it is best to get rid of as much as you can using wet and dry where you can. As regards your worn throttle slide yes it will cause problems but this can be countered by changing your throttle spring for a heavier spring to help the slide return along with regularly applying a little PTFE lubricant in the slide bore or if you are not on a budget just buy a new throttle slide or complete carburettor of course.

I'll give everything you mentioned a check and clean also I've ordered a service kit for carb with a slide so will fit that and take it from there. Thanks 👍

[lineaway]

9 minutes ago, Donaldw said:

It's a kiehin pwk 28mm

There is a needle jet that could be missing causing the needle to stick.

 Thats not the stock carb.