Question about 1988 Yamaha TZR 250

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Bike wont run for more than 5 secs and thats when it does start

After striping and re-building the carb on my yam tzr 125 2rk 1988. and put a new fuel filter on due to spluttering the bike was fine, iv done 40+ miles and ran as good as ever. i stopped in at a shop and when i got back on my bike i rode away and the bike spluttered and died. the bike has never been a smoker but now i can only get it to start for about 5 secs every now and again with the throttle wide open and in that time it gives out loads of smoke. any ideas where to start?

thanks stu

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Not sure but it sounds like it's running too rich a mixture and/or your float levels are not adjusted properly. When you stopped the excess fuel has gone into the bore not burned which will wet your spark plug making it very difficult to start. Depending on the colour of the smoke it could also indicate that your mixture is too rich. For extra power you need more air not necessarily more fuel. I hope that helps you. Again not sure but sounds like that is your problem. :)

Posted on Sep 27, 2009

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I need a carb diagram for yamaha tzr 250 cc motor cycle year 1988 it will not rev with out choke on . blocked jets?

Hi, Rolandwhitfo and the usual suspects are:
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I have a 1993 XR 600. I was recently riding and I noticed the bike started stalling. It wouldn't idle and then started noticing that it started leaking gas out of a little rubber black hose. Then the bike...

Yes, your carburetor needs to come off and be disassembled and put into a carburetor solution and soak for at least 2 - 24 hours depending on how bacd it looks when you take it apart.
Then rinsed with water and then blown out with compressed air, in every orfice in the carb body and jets

Reassemble and she'll puurr like a kitten again and have great response, run like new.
Ever since they have been putting ethanol in the gasoline, i've been doing a lot of carb cleanings.

Your gas tank will get a build up of ethanol residue that turns thick, it eventually clogs up petcocks and fuel filters and the little holes in the sides of the carb jets.
Soaking them brings them back to life without scratching, soak everything taken out of the carb except o-rings, gaskets,and float. Then soak the whole carb body and all the jets.

So i would suggest that when you do the carb clean, you drain the old gas out of the gas tank, and start off with a fresh tank of gas, and a new fuel filter.
You can also add seafoam to your fuel and this seems to help prevent corrosion of the ethanol.

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1980 Yamaha XS 400 Special First, How do you tell if it has an electronic ignition? Second, Can't get it to start. Have put gas in spark plug holes. Didn't hit. Bike has been setting on a dirt...

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Before you sink a lot of money into the bike, check for spark. If spark is present, coast the bike down a good sized hill without any spark plugs being installed. Put the bike in 3rd gear as you go downhill then let the clutch out to turn the engine over. Now ( using the clutch lever ), shift through all the gears then neutral. If the bike will not shift properly it likely has a bent shift fork. I can't find any forks avaiable. With a bad tranny I would put it back in the dirt floor building and find a newer bike. Here is a link to Babbitt's. Please rate my answer. Thanks.

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Went i star the bike i open the choke to warm the bike after a few sec close the shock the bike die runs only with the choke open what can be

This is a classic example of a clogged pilot jet in the carburetor. You need to clean the carburetor circuits and jets.

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The floats in the carbs are sticking open allowing the carb to overflow and fill the crank. Disassemble the carbs for cleaning. Also, turn off the gas tank valve when parked.

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My yamaha tzr 250 runs for just a few minutes and the engine dies out.and when i try to start will only run again after a few minutes of rest....

Check your fuel lines and filters. If these are dirty then maybe the fuel is restricted so when you rest the bike the carbs will refill.

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My 50cc mini bike starts then dies 5 secs after starting. why?

It sounds like you may have 2 problems

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dump out the gas put new in
Remove the spar plug and examine the plug if it is wet and black it is fouled
if it is white ad dry it is not getting gas

If you can replace the spark plug if not just clean it with a wire brush put back in and tighten

Finally make sure the spark plug wire is not lose

Best of luck to you

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