Hi all.
I need to know if this is an issue or not.
Recently i had a stick throttle and i tried to adjust the slack in the carb and in the handle bar but could not get it to work. I checked to see if the handle bar end was the issue as i read somewhere that it might be sticking on the handle bar ends but that was not the issue. I lubed the cables and check for tears and could not find any.
What i noticed was that there were so much dirty on the outside of the carburetors and the springs were covered with it.
I removed the carbs as in needed to change the carb rubber boots and clean them. The carbs insides were not too bad but outside the were so much S___t and the throttle spring was full of it.
I made a good progress and the carbs now look great.
But i have tried to open the carb vents by pushing the spring but when i let it go it stays in place with the vents open. I have lubed the springs again after the cleaning but still the same.
This is my first time getting my hands dirty in removing carbs and cleaning them. So wondering if this is a normal thing or should the spring snap back when i let them go and close the vents.
Cheers
adasilva
if you are meaning the butterfly valves (brass bits) then yes that should snap back to the closed position (especially if no cables on)
is there any chance of some photos or a video to give us a clearer idea, we might spot something missing or misplaced
Yes that is what i meant. The cables are disconnected as the carbs are out.
I will post some images later today when i get back home.
thanks Disorderlypunk
How much force does it take to rotate the butterflies?
The springs are quite stiff so it should feel uncomfortable pushing the pulley with your thumb. If it opens with little resistance check the two springs are not broken and the inner ends are fixed to the pulley and outer ends fixed to the bodies of carb 2&3.
On the other hand, if there’s massive resistance to rotation that the springs can’t overcome then it sounds as if the shaft either has got corrosion jamming the pivots… or the entire assembly has been dropped and things are no longer straight.
Hey Guys.
I just went home for lunch and decided to have another look. while i was contemplating what would be causing this issue a light bulb come on. Could it be the TPS as i had changed it.
So i removed it from the carbs and bingo! the spring snapped back.
I then put it back on and did not tied the TPS screws as much as it was before and they still snapping back.
So now i will have to reset the TPS but and try not to tie the screws too much.
Strange one
Good thing is that is not the springs that is the problem. But i am afraid that when i put the carbs back and reset the TPS this will happen again as I remember that i had to tied the screws in such way as to have a 5000 RPM steady reading.
Thanks for your help and i will let you know once i have put it back on the bike.
adasilva
Ah! I’d forgotten the TPS was also a factor.
It should be possible to tighten the screws up firmly, you don’t want it drifting out of calibration.
Just make sure it’s centred and you should be OK.
well that is definatly one for the memory - wouldnt have thought about the tps untill checking pretty much everything else lol
good find :thumbup :thumbup
FazerRider
Can you explain what you mean by centre the TPS?
cheers
I’m just guessing that the TPS was bolted down such that it was applying sideways pressure on the shaft, i.e that its axis was slightly off to one side rather than concentric with the shaft. There should be enough free play available between the screws and the slots in the TPS (when they’re loose) to be able to get the TPS centred.
Another cause for the problem might be that the TPS is pressing on the end of the shaft, but it’s hard to see how that could happen unless there’s a lot of dirt in there or the TPS is non-standard.
12-03-18, 10:48 PM
(This post was last modified: 12-03-18, 10:50 PM by tommyardin.)
Interesting post and helpful information.
I was wondering if the return springs had just not been fitted/anchored in the right position after strip down and rebuild. But that is obviously not the case as the Butterflys snap back shut with the TPS removed.
Its always a good policy when fitting any part to put all the fixing screws in place without tightening them up, and centre the part by wiggling it about within the tolerance of the fixing holes to centre the part.
Now I'm not convinced that makes a lot of sense but at least I know what I mean
Looks like you have done a nice job on the carb clean they look good, well done :thumbup
Oh ! one other thing I know what the TPS is but what do those initials stand for? or what do they mean?
Hey guys. This is taking my night's sleep now.
I have put the TPS back in place and tried as peer your suggestions to centre it but no matter what i do the bloody thing stops the spring from snapping back. It only allows it to spring back if the screws are bit loosed. Once i tied them down ( and i am doing that using the same amount of turns on each screw at time) it locks the spring.
any ideas on what i am be doing wrong?
Remove the TPS, rotate the inner until it stops, (note which direction you rotated it) put it on the carb and try it. If it does not work remove it and rotate it in the opposite direction until it stops now try it on the carb again.
i have no experiance with the tps but it might be worth looking at it on its own and seeing if the movement feels 'notchy'
if it is it might be worth giving a clean with some electrical cleaner (might be some sh*te in it)
if there is damage to the rotational parts it might need replaced and you wont be happy as i am sure i read they are a bit pricey
It sounds to me like it's either the wrong tps or it's supposed to have a spacer (1-1.5mm ish) behind it.
I'm assuming the screws are m4 or m5. Try putting a washer of the relevant size on each screw between the tps and the carbs then try it, this will prove a theory, a solution can be worked out later.
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From experience don't even bother buying a "used" TPS simply because of the age of the bikes now.
You could be buying a part that is 15-20 years old that is just waiting to play games with you or pack up completely, so just buy a new one if necessary.
Don't worry about buying a year specific TPS, as they'll work on all 98-03 bikes.
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