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Flat spots when accelerating above 30mph

My ZZR600 was firing on 3 cylinders so changed the plugs, air and fuel filters. It starts fine and idles much better with a little hesitation but now have flat spots when accelerating above 30mph. Also experiencing surges and at times no acceleration at all. Any ideas before I take it to a mechanic bearing in mind this my winter bike and want to avoid unnecessary costs?

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Try spraying some wd40 on the wires to rule-out bad wires.

Posted on Feb 10, 2014


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Posted on Jan 02, 2017

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SOURCE: dt 125lc 1987 back misfires and does not pick up on acceleration

I am going to have you do a series of things to clear up the problem. First come the basics >

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new STOCK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Don't be cheap, use a lot of cleaner. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean and dry the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road unless other problems exist.
Let's say that the bike is no better >

  • How good is your battery?
  • Carb, head, intake manifold and carb mounted tight?
  • Does the carb intake manifold have reeds? What condition are they in?
  • Remove the flywheel cover. Take hold of the flywheel and, without turning the wheel, lift the flywheel up and down then left and right. Any movement or was the flywheel rock solid? If movement then the crank bearings need replaced along with the crank seals.
  • Speaking of crank seals, how old are your seals? The bike ain't gonna run with bad seals.
  • I don't recall for sure, does the bike have CDI? If so, have the dealer test the CDI and the coil.
  • If no CDI, when was the last time the points and condenser were replaced or points filed and set? Get the coil checked.
  • How old are the piston and rings? You could have problems there. What shape is the cylinder wall in? Scared up, low spots (you will not see the low spots without running a cylinder hone through the bore).

There isn't much more to do. You just rebuilt the engine.
Please rate this solution. Thanks!

Posted on Apr 02, 2009

  • 425 Answers

SOURCE: Hesitates and backfires through the exaust when accelerating

Sounds as if your timing is not quite right. You need a manual, but The best I can offer is a 98: , it may help, but if you only have 1100 miles on it, I would be taking it to a qualified mechanic to be fixed. Up to you.

Posted on Jan 19, 2010

  • 1 Answer

SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration

I have the same bike and same problem. Check the intake hose that connects the carb to the motor it may have a crack mine did and lost power when the bike warmed up. They don't make a replacement hose for it so I am using a rubber plumbers coupling with hose clamps. Might work? The hose is inch and a half diameter and about three inches long try that maybe. Good luck If it makes a chirping sound when the bike gets warm it's probably that hose sucking in air and screwingup your mixture.

Posted on May 06, 2010

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