bike intermittantly doesnt load when rolling on the throttle

[boldor]

Hi there , we have a 2001 GZ 250 with 12,000 miles on the clock. It starts well, idles well and is more than happy at 65 MPH on the flat

What it is occassionally doing , and it has been when warm , after rolling off the throttle and changing down, is when the throttle is rolled on there is nothing for say 1 to 2 seconds , then the bike kicks in and accellerates, till the next higher gear, and the same, nothing for say 1 or 2 seconds then away we go

This can last for a minute or so and then goes away

Of late it hasnt been happening, with a typical day being a 30 mile open road run to work each way, with some serious hill work included

any thoughts appreciated

cheers and thanks
leroy

[blaine]

Welcome.The carbs on these bikes are real fussy.You can try a good quality carb cleaner in a tank of fuel.A lot of the time it helps.
:cool: :)

[boldor]

Excellent , thanks blaine ! I will try that indeed, and certainly a very easy cure

thanks and cheers
leroy :cool:

[mrlmd1]

Berryman's B12 Chemtool ($2.89 a can at Walmart or Advance Auto Parts) or Seafoam ($9.99) - 1-2 oz./gal of fuel, (no more) dumped into the gas tank with the fuel. Do that every 3-4 fill-ups and you will have no further dirty carb problems (unless you have dirt or rust or something in the gas tank getting into the carb). You can prevent that with a small inline fuel filter.

[jonathan180iq]

.... You can prevent that with a small inline fuel filter.

:plus1:
The only "filter" the bike has from the factory is a crappy mesh screen. These inline filters cost about $4 and take minutes to install.
This should required instruction for all new forum members ;)

[dentheman]

Is it possible that the throttle cable is sticking, then letting go? This sounds like strange behavior for a carb problem.

[mrlmd1]

If the cable was hanging up (stuck due to friction) it wouldn't idle down when you released the throttle.
It doesn't hurt to lube it though.

[boldor]

thanks everyone, most helpfull :2tup:

The bike had been sitting for a while, but now it gets at least 3 day a week 60 mile run
off to the auto shop this weekend, carb cleaner and new plug for the sake of it
gave it a good go over the other day; air cleaner good; cleaning, adjusting up the chain and oiling it smoothed the bike on roll off roll on throttle. Valves fine. :)

Cheers all
leroy

[raul10141964]

sound like a carbon build up remove the top cover and pull the slider out an cleaned it

[Water Warrior 2]

thanks everyone, most helpfull :2tup:

The bike had been sitting for a while, but now it gets at least 3 day a week 60 mile run
off to the auto shop this weekend, carb cleaner and new plug for the sake of it
gave it a good go over the other day; air cleaner good; cleaning, adjusting up the chain and oiling it smoothed the bike on roll off roll on throttle. Valves fine. :)

Cheers all
leroy
A slack chain will do that. It must be within specs for the smoothest response when operating the throttle. The off/on throttle reaction you were feeling is most noticeable at lower speeds.

[mhoughton]

Did you fix your problem Boldor? I, too, am having issues that sound like yours. It's almost like the engine bogs down but usually clears up after a few seconds. I've been running Seafoam through (for about 130 miles) but it hasn't seemed to do much. Think it's time to remove the carb and clean it out?

[boldor]

Hi there , not sure if fixed or not :??: . I've put carb cleaner in the tank but yet to run the bike with it in. The problem hasn't reappeared for about the last 100 miles of use...but will let you know after say a couple of weeks of ongoing running

cheers
Leroy