Throttle sticking ... only when riding?! - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 6 (permalink) Old 08-20-2019, 02:47 PM Thread Starter
300EX Rider
 
Join Date: Dec 2008
Location: Quebec, Canada
Posts: 998
Throttle sticking ... only when riding?!

OK this is a weird one. For a while now it seems my throttle has been getting increasingly difficult to push and it feels sticky, not smooth at all. The throttle cable is not NEW but it's been replaced when i had my rings and stuff redone like 2-3 years ago. I know this sounds like a lot but I don't ride this bike all that much so realistically 2 years is not much riding, maybe like 50 rides or something?

Anyway, the other day i was driving and all of a sudden I COULD NOT push the throttle in any further, I must've been at 3/4 throttle or something. Seemed like the sticky throttle had been pushed to the extreme for a second. It lasted like 2 seconds and returned to just being crappy but that scared me a bit and I decided to investigate. I started by the simplest, took off the throttle housing cover and drenched that with WD40. Also shot some in the hole where the throttle attaches hoping that it would drip down in the actual cable. Felt SUPER smooth after that, much better than before. I thought job done and screwed the cover back on.

Next ride of course the throttle is weird again. Kinda baffled at this point. I just messed with it a bit and when the bike is off the throttle seems pretty smooth. Not as much as when i had just WD40ed the housing but still pretty good. I took the carb off and I'm going to tear it down to clean it and see if anything seems odd in there. Seems weird that it works relatively smoothly when not running but then when I'm riding it feels sticky and stiff.

Anyone ever heard of this? Doesn't make sense to me...
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post #2 of 6 (permalink) Old 08-20-2019, 04:28 PM
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Hmm I would inspect the throttle drum that lifts your slide assuming that your bike has an fcr carb. Inspect the wheels on the slide, vacuum plate, and vacuum plate o ring. If everything looks good start with replacing the cable since that did somewhat help.
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post #3 of 6 (permalink) Old 08-21-2019, 07:42 AM Thread Starter
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Quote:
Originally Posted by Rg450r View Post
Hmm I would inspect the throttle drum that lifts your slide assuming that your bike has an fcr carb. Inspect the wheels on the slide, vacuum plate, and vacuum plate o ring. If everything looks good start with replacing the cable since that did somewhat help.
It's an 05, no FCR.

05 trx450r

Full Sparks exhaust
CW 480cc cylinder
Venom 12.4:1 97mm piston / Balanced Honda revised crank
Stage 2 hotcam
CRF450 clutch / CR500 springs / Trinity cover
UNI filter
Cut airbox lid w/ outerwears
R&D Fuel screw (2 turns out)
Jetting : 185 Main, 50 pilot, HRC needle third clip
Fox FLOAT Evol shocks / Lonestar DC4 arms
Pro-taper bars / Fly grips / Powermadd guards
Moose bumper
Maxxis Razr tires

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post #4 of 6 (permalink) Old 08-22-2019, 09:07 AM
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Hi Denis, it must be vacuum related, when the engine is runing it pulls a lot of vacuum. I'm pretty sure it's carburetor related, maybe the drum is worn. Not a 2004-05 expert, but I would try it on the bench with a shop vac to see how it sticks.
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2008 TRX 450ER XC racing
FMSQ # 281
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post #5 of 6 (permalink) Old 08-22-2019, 12:09 PM Thread Starter
300EX Rider
 
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Location: Quebec, Canada
Posts: 998
is it time to get a bored FCR? :D

05 trx450r

Full Sparks exhaust
CW 480cc cylinder
Venom 12.4:1 97mm piston / Balanced Honda revised crank
Stage 2 hotcam
CRF450 clutch / CR500 springs / Trinity cover
UNI filter
Cut airbox lid w/ outerwears
R&D Fuel screw (2 turns out)
Jetting : 185 Main, 50 pilot, HRC needle third clip
Fox FLOAT Evol shocks / Lonestar DC4 arms
Pro-taper bars / Fly grips / Powermadd guards
Moose bumper
Maxxis Razr tires

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post #6 of 6 (permalink) Old 08-22-2019, 09:50 PM
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Yeah why not, bored but not boring lol

2008 TRX 450ER XC racing
FMSQ # 281
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