Carb Issues

[newfiebullet]

i have a 85 200e yamaha trike. i'm having quite a bit of carb trouble. ill try to explain all the symptoms, the only tread i found like this had no replies. will start first pull and idle away every time.when it warms up it wont stay idling. adjusting the idle screw does noting. pulling the choke only makes it idle down a little.if i put the air filter on there it has no power and barely stays going. runs and starts the same with the choke installed or removed. the needle valve was slightly bent so i straightened it back out but no difference. the rings and valve seals were gone for some time before i bought the bike and it still has the factory exhaust so its possible it may also be a little plugged.im open to rebuilding , from my understanding i need a timberwolf carb kit..92-98 i assume. the guy i bought it off was a d-bag and has some questionable things done so im thinking the carb was never cleaned or at least some cleaner ran through the gas. any help appreciated. also on a side note will bad rings seem like the clutch is getting bad?like no power on bottom end just revs a bit without doing much? i may need that too lol.

[belly]

I'm not familiar with the 200e, however go through the carb again. take out the jets and seals and clean them througoughly. make sure the tiny holes on sides of the main jet are clear. Sometimes there's still some gunk we miss the first time. Assemble and see if it improves. Also check out the fuel petcock. (on/off) valve. make sure gas flows and doesn't trickle out. If the gas cap has a vent, make sure it's not plugged. Check the clutch cable to see if it's adjusted out too far. loosen it up until there's slack in the lever. Then tighten up to where there's a small gap between the lever and perch. If it's still revving and not moving, it may be time for a new clutch. Is the cable "sticky"? it should move smooth and freely. Hope this helps.

[newfiebullet]

it dosent have a manual clutch, i was thinkin the friction plates are gettin bad....i did discover that the little transfer hose on both sides of the tank dosent work i took it off and noting came out theres a stick jammed in there in the nipple, it had to be purposely put there....so next time i go at it im cleaning the gas tank. and the carb thoroughly...also the choke used to be stuck but i got it out and freed up if that makes any difference

[newfiebullet]

can anyone lend a hand as to what carb kit i should look for there seems to be 2 different timberwolf ones

[fordtech90]

Definitely need to rebuild your carb and if clutch cable is adjusted properly then you need a clutch. Rings would cause lack of power, smoke, burn oil, crankcase blowby...so on. When your friction plates get bad in your clutch when you rev up they dont hold like they are supposed to, to apply the power to the wheels instead the engine keeps revving up but the power never makes it to the wheels.

[newfiebullet]

my rings are toast...smokes like a train and blows oil out the tail pipe, about a quart a day...fortunately rings and gasket kit are in the mail.i wasnt aware these had a clutch cable? there's no handle you just let go of the gas shift and go on again. like a 250 big red...also i added some smoke stop to the oil to see if it was the seals (just bought the bike) so maybe the clutches dont like that either :D lol

[newfiebullet]

will a carb kit for a 86 yfm200 work?

[newfiebullet]

thought i might also add that shes drinkin fuel like something mad...i mean like 20 miles to a tank...im heading back home for xmas for a couple days so im gonna clean the tank,petcock and carb.....plus toss in new rings. see where it goes from there.cant get any worse.im thinkin the stock exhaust is a little plugged with oil as well cause the back rack behind the muffler is coated is oil and soot.ill try and get some more pic then too :)

[newfiebullet]

happy to say the cleaning made a great improvement still need an airfilter tho...the one that case with the mesh frame rotted and fell apart when i tried to clean it.

[Steve88]

Hey man i just got a 200e too, guy before me was the same. Mine is the same way.. starts and idles but will bog out... also barely any power getting to the wheels.. did this happen to you?

[SGabe]

On the right hand side of the bike there is a nut and threaded "bolt" that takes a flat head screw driver. This is the clutch adjustment. I have a '84 and its all the same. As far as the carb is concerned, it needs to be soaked, brushed with a toothbrush, and blown out with high pressure air. I found that if you think its clean do it two more times. Also it wont hurt to remove the air box and air hoses and flush and clean those well. Just normal soap and water.

[B18PWR]

If the engine has poor sealing ie valve seats and bore wear you are off to a bad start , with these fixed you have a good starting point . The engine needs to be in good operating condition but it sounds like you have wear in everything so thoroughly go through everything according to a manual . With this done you will have an engine that will have good vacuum and therefore your carb will work correctly , as people have said go through the carb and again set it as the manual says, including checking the float height, and you won't go far wrong . If the needle in the carb has had the clip put in a different position ie lower this can also contribute to the fact that the mixture screw isn't doing a lot . Hope you have some luck with it .

[newfiebullet]

i will be doing the rest of the work when i get back out home in a few weeks but i have:

1.Full Top End Gasket Kit ( including valve seals)
2.New piston rings
3.New Clutch friction plates and springs
4.An Exhaust that isnt full of holes. lol


this thing burns a crazy amount of oil so that's where im heading next. after that ill see how it runs, as of now its much better even with the bad seals and rings.so hopefully this solves most of my problems.

[trike savior]

it will help to rebuild motor. hard to properly diagnose carb issues because it can be the top end is just getting too weak. sounds to me like you are running too rich. if it runs fine when cold but not when hot it can mean two things,

1) (with a good engine) the engine needs more fuel when its cold, hence why choke blade basically shuts off most air. if it cold starts without choke no problem and is drinking fuel, and it seems to help to remove the air filter (i.e. giving more air), it is running too rich. either leaky needle valve or the wrong size jets.

2) as an old tired engine warms up it begins to make less compression, in most cases it wont idle without some throttle and wont rev very high and tons of smoke like your saying.

unfortunately i cant help with what carb kit to buy because i do not know yamaha's.

before you buy new clutch parts try what SGabe said. i have had similar problem with one of my hondas and adjusting the clutch fixed it. if its out of adjustment it will not grip.

when you put in new carb parts and get it working properly it will still not work properly if you are missing air filter and have a holey exhaust. these will need to be fixed or you will need to buy larger main jet.

when you go to rebuild motor dont forget to check valves for leaking. as taking it apart and have exhaust and carb off, pull the cam out. take a compresstion tester and take the valve core out (like in valve stem of tire) of the engine end of hose. thread into head and hook up shop air to it. listen to intake and exhaust ports for air leaking. air leaking into crankcase, past rings is normal.
or with head off turn it upside down and put in vise (valves up) and put spark plug in. pour in gas until it covers valves. should hold the gas without leaking. if it drains out quickly look in each port for gas to see which or if both valves are leaking.

[newfiebullet]

already have the clutch plates bought will try a adjustment first tho... thanks again for the help...like i said the rings and valve seals are gone so im thinking thats half my issues there...after that i can look at carb adjustments and hopefully get it just right

[newfiebullet]

also planned on adjusting valves while i was in there