Question about 1990 Yamaha FZR 250 R
I have a yamaha fzr 250 grey import, it takes a while for it to start even with the choke on, most the time the throttle has to be completely open and it will start but then i need to take 10minutes to slowly release the throttle back till it is idoling on its own... also i have just replaced the pistons and rings and i put the cams and crank back in the exact possition but has found it has no power and wen slowing down it will get a slight rumble type of back fire.. please can anyone help me as i miss riding cause of these problems.. should i just give up on it and ride my girlfriends R6??
Hi, Ttiimmiiss it could be a timing issue or the list below and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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Yamaha FZR400 1988 1989 Service Manual
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Posted on Apr 20, 2017
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Posted on Jan 02, 2017
SOURCE: misfire & spluttering when warm
Not knowing what you have checked or done already, I would first remove the spark plug from the bike and check it fir a carbon deposits. If it has not had a new one for a while, Just get a new one and replace it. Before I drop the oil for a service(as it can dirty up the oil), I also like to run a fuel system cleaner additrive(I use a Nulon product) to my bikes every few thousand kays, just to keep everything tip top. If you still have misfire problems, then it will most likely be a faulty sparkplug cap, ignition lead or other ignition part. Change out/clean spark plug with a wire brush first. I think that will fix it for you. If you still have problems,happy to talk to you more about it.
Posted on Nov 20, 2008
possibly water in your fuel.... it's a small tank so just put about a quarter bottle of gas line antifreeze in the tank... it's alcohol so it will **** up the water. there is also the possibility the fuel is somewhat dirty... change the fuel filter as well
Posted on Feb 05, 2009
dont give up on it yet. the CDI costs much! This sounds like a wiring problem. I've had the same problem before but i checked and traced the wiring and found out that the positive lead wire is making contact with the chassis.. due to vibration and just, it must have eaten the insulator. Check on this part. Also, make sure that your carb jets and spark plugs are clean.
-hope this gives you an idea.
Posted on Apr 01, 2009
SOURCE: 1989 tw200 yamaha won't start
G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..
Posted on Jun 03, 2009
Try taking air cleaner off before going to far, Blow carbies with air, dont use full force I done this to mine and it fixed it you may be lucky dirty jets.
Posted on Jan 10, 2010
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