k2 curvy running problem

[Nicky S]

hey org

my curvy has started to play up i have to rev it to stop it from cuting out it will not run on tick over at all. when riding the bike it has a lose of power and allways feels like the brake is on.

if i accelerate then close the throttle the bike backfires and kicks a lot of flames.

i have put new plugs into the bike and still have the same problem i checked the HD leads and they seem ok.

i also thought that there might be crap in my fuel tank or fuel pipes so have put a full tank in to try and push it out.

i have now run out of ideas unless its the carbs that are unbalanced but i have no idea how to check that and i know they were rebalanced around 5000 miles ago

my dad thinks that i might need a new head as he thinks it is compression

cheers nicky s

is your idle screw turned in or out,where do the carb linkages stop when you close the throttle?

[Biker Biggles]

Curvy rough running.Theres a few old favourites to check out and you may have already done some,but----
Choke cables and plungers.They stick and cause one or both pots to run rich
Water in front plug area causing misfire.
(What did the old plugs look like)
Water in fuel.Does the drain pipe from the tank filler area actually drain water out through the pipe that exits under the rear of the tank?Or has it rusted through inside the tank and dumps water in there?If so this can accumalate in the carb float bowls which will need draining.
Wiring loom chafing under the riders seat around the headstock and rear subframe.Difficult to find so Id check out the above thoroughly first.
Do you get a good spark on both plugs?

[Nicky S]

Originally Posted by Razor

is your idle screw turned in or out,where do the carb linkages stop when you close the throttle?

im not sure about the idle screw as it dose not really move and i dont want to brake it

Originally Posted by Biker Biggles

Curvy rough running.Theres a few old favourites to check out and you may have already done some,but----
Choke cables and plungers.They stick and cause one or both pots to run rich
Water in front plug area causing misfire.
(What did the old plugs look like)
Water in fuel.Does the drain pipe from the tank filler area actually drain water out through the pipe that exits under the rear of the tank?Or has it rusted through inside the tank and dumps water in there?If so this can accumalate in the carb float bowls which will need draining.
Wiring loom chafing under the riders seat around the headstock and rear subframe.Difficult to find so Id check out the above thoroughly first.
Do you get a good spark on both plugs?

Choke cables and plungers are ok

Water in front plug area causing misfire. - i dont really ride in the rain but i do know about this when removing the old plug it was rather lose and very rusty so water has been geting there not sure if into the enginge.

Water in fuel.Does the drain pipe from the tank filler area actually drain water out through the pipe that exits under the rear of the tank?Or has it rusted through inside the tank and dumps water in there?If so this can accumalate in the carb float bowls which will need draining. - ahhh i didnt think about that at all i did check to make sure that it was not leaking in air but i will check that pipe

wirring loom is fine its the first thing i checked

spark is fine on both plugs

[yorkie_chris]

Choke plungers?

what's it like on startup?

[Nicky S]

Originally Posted by yorkie_chris

Choke plungers?

what's it like on startup?

very poor will not run unless i rev it or use the choke but as soon as i let the choke off it will stall

check your idle speed, if it won't idle turn the idle screw to the right until it will

always check simple stuff first, amirite

[Biker Biggles]

Idle wont account for the lack of power at road speed though.(Feels like the brake is on)
An intake air leak causing a very weak mixture might though?

was this bike properly de-restricted?

[Nicky S]

Originally Posted by Razor

check your idle speed, if it won't idle turn the idle screw to the right until it will

always check simple stuff first, amirite

kk

Originally Posted by Biker Biggles

Idle wont account for the lack of power at road speed though.(Feels like the brake is on)
An intake air leak causing a very weak mixture might though?

the mixture is anohter thing on my mind

Originally Posted by Razor

was this bike properly de-restricted?

yes it was 2 washers from under the bottom of the carbs