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Shindaiwa T2500 Hard to start

Discussion in 'Mechanic and Repair' started by mcambrose, Apr 14, 2005.

  1. mcambrose

    mcambrose LawnSite Senior Member
    Messages: 518

    I have a T2500 (4-stroke) trimmer which has been upgraded to 2510. It runs great, but it is a devil to start. I choke it and prime it and it takes 4-8 pulls when cold. After it warms up, if you turn it off you can crank it with one pull. However, it it sits a few minutes then it won't start unless I prime it, choke it and give it full throttle. It taks 5-10 pulls to start it under this scenario. It is almost as if the gas is draining back out. When the trimmer is running, it runs and idles great. The plug is new and works good in another T2510 I own. Also, I usually operate the timmer at almost full throttle and I have tried turning the unit upside down and shaking it before I turn it off to make sure no oil has accumulated (suggested by factory rep). One other thing I noticed is that the rope seems harder to pull when it is hard to start. It is as if the decompression valve is not working properly. Any suggestions are appreciated.
  2. dishboy

    dishboy LawnSite Fanatic
    from zone 6
    Messages: 6,109

    Try letting it idle for a few minutes before shutting down, when the rpms drop it should be cool enough. If in a hurry to shut down set in trimmer rack idleing and use blower to cool down cylinder before blowing off lawn.
  3. mcambrose

    mcambrose LawnSite Senior Member
    Messages: 518

    Talked to Shindaiwa rep. He said they have had a problem with vapor lock, so the upgrade kit has stainless bolts for the carburetor which has different heat transfer properties than mild steel. My trimmer wouldn't start the other day even when cold, so I checked the plug and there was just a very small amount of carbon deep in the plug. I removed it with a small wire andthen washed it out with brake pad cleaner. It started again and ran well. The spark plug in these units seems to be especially sensitive to carbon buildup.

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