k2 curvy running problem
 

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

Re: k2 curvy running problem
 

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

Re: k2 curvy running problem
 

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?

Re: k2 curvy running problem
 

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


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

Re: k2 curvy running problem
 

Choke plungers?

what's it like on startup?

Re: k2 curvy running problem
 

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

Re: k2 curvy running problem
 

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

Re: k2 curvy running problem
 

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?

Re: k2 curvy running problem
 

was this bike properly de-restricted?

Re: k2 curvy running problem
 

kk

the mixture is anohter thing on my mind


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

Re: k2 curvy running problem
 

did it run ok after the 2 washers were taken out?

Re: k2 curvy running problem
 

yer it run fine

Re: k2 curvy running problem
 

does it stink of fuel out the back? sounds like it could be a stuck float.

Re: k2 curvy running problem
 

right have spent the last few hours looking over the bike and think i might have got it.

when i have the bike running holding the revs at around 2.5k to stop it from stalling there is a sound that comes from the front carb on the front head that sounds like blowing air (is there only way i can explain it)

so i am ever losing compression at the spark plug or leaking around the head .... but then again mabey not as there is no oil ec.

the nosie also sounds like it is coming from the front carb so i have had them off the bike and looking over them i found this.

http://streamingtwoandahalfmen.com/carb2.jpg

http://streamingtwoandahalfmen.com/carb1.jpg

this is were the choke goes into the front carb as you can see the mount is broken do you think this has anything to do with the problem i am having? as the choke could always be on meaning its throwing to much fuel in ?

also as you can see i F****D the screws to try and undo them i still have not got them undone :(

Re: k2 curvy running problem
 

You need to learn how to undo stubborn screws.
http://www.youtube.com/watch?v=uc7uyMs-YtQ

chokes are a possibility. While you have carb off take float bowls off and check for crap.

Re: k2 curvy running problem
 

nope no smell of fuel

Re: k2 curvy running problem
 

YC lol nice video

so if there is crap in my float bowl it is problem a stuck float ?

Re: k2 curvy running problem
 

could be stuck float giving too much fuel, are the plugs wet?

or it could be a blocked jet giving not enough. Just generally look over the carbs, is there loads of carbon deposit on the backs of the butterflys?

Re: k2 curvy running problem
 

nope plugs arnt wet has brand new ones init

nope the butterflys are as clean as anything

Re: k2 curvy running problem
 

So many curvy running issues are down to dodgy choke plungers.You need to get that mullered screw out and check the innards.And the other cylinder.

Re: k2 curvy running problem
 

ill have the choke plungers out 2moz, what you mean the other cylinder

Re: k2 curvy running problem
 

Theres another one the same on the other carb.That needs maintenance too.

Re: k2 curvy running problem
 

ohhh yer i know sorrie had a stupied moment

Re: k2 curvy running problem
 

right i have gone all over the carbs cleaned them and put them back on the bike still have the same problem.

i went for a quick ride to see if it was any better and it feels like im ridding with the front brake on the hole time and it back fires and pops a lot.

i decided to have a look over the engine again and took the front HD lead off and run the bike it still runs funny. so placed it back on and took the back HD lead off. bike runs fine.

so my next step is to check the coil??? the black box that the hd lead gose into iv got a haynes manual so ill do it as it says. then also check the compression

what do you think ?

Re: k2 curvy running problem
 

The bike runs fine with no rear HT lead? I doubt it!

Re: k2 curvy running problem
 

Did you get the choke cables and plungers really free and clean?

Like the others have said, sticky choke cables and/or plungers will cause real running problems on the curvey, and the plungers only have to be cracked off their seats a fraction to cause it. I had this problem on my curvey when it was only a month or 2 old due to white crud at the end of the cable where it meets the plunger (I believe it was flux from cable manufacture).

Are the plunger springs in good condition? They can rust and break eventually.

Oil everything liberally when you reassemble them, especially running some oil into the cables. Make a small funnel out of a plastic bag corner held onto the end of the cable outer with a rubber band and leave it suspended with thin oil in it for a few hours (overnight etc) for the oil to work its way down.

Re: k2 curvy running problem
 

If you get some spray grease and a spray nozzle off the WD or something you can pack the cable splitter with grease very easily

Re: k2 curvy running problem
 

well no it dont but it runs with out any problems .. like poping and back fireing. i didnt ride it jsut started it

done all of that already :)

done that 2 after i watched your video :)

Re: k2 curvy running problem
 

The rear coils are prone to failing on curvy's.

Re: k2 curvy running problem
 

are they iv never read that... but im hopeing that is what it is, going to test it sometime this week

Re: k2 curvy running problem
 

right time for a update :)

had another good look over the bike and im still lost on whats wrong with it :(

had the chance to use some bits from greyfear's bike witch runs fine, i put both my coils into his bike and both his into mine. my bike still pops and bangs but his runs fine so i now know it is not my coils and HD leads.

if you lift the tank and stand on the left side of the bike, were the fuel sensor ect goes into the tank there is a brever pipe that goes from the tank to the carbs. when the bike is running i can feel air being pushed out of the engine/carbs/pipe ????? not sure were its from but it goes away when the bike is in higher revs.

so i have replaces the pipe and i still have a leak could this be the problem ???

also i still have not fixed the choke as im waiting on parts

carb question
 

hey guys

referring this thread http://forums.sv650.org/showthread.php?t=154368

i was just about to buy some bits to fix the choke cable to try and fix the problem i am having with my carbs. Looking at the split image on Alpha Sports. it shows some sort of rubber bung that gose over the adjuster screw, when removing my carbs i noticed i didnt have any bungs could this cause me a problem (may be a stupied question but ill never know unless i ask)

also what are the heaters all about on the carbs i dont get it

could someone please explain ???

also could these be my problem as i have been all over the carbs, i even stuck a mates carbs in my bike to make sure it was the carbs and the bike run fine so it can only be the carbs. when going over the carbs nothing seems wrong what so ever

cheers nicky s

Re: carb question
 

i've had the same sort of problems as hyou since putting on my new carbs but think mines down to my front carb having issues, front slider dies'nt move when i rev it up and feels ike im on 33bhp again lol. also pops and bangs alot and scares people :/