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Old 07-21-2011, 06:36 PM   #1 (permalink)
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1988 trx250x

I bought a TRX250X with a ticking noise in it. We open up the top end and noticed the rocker arms were worn. We replaced those, as well as, the Cam Shaft and bearings but 4-wheeler still is ticking loud. When accelerating it gets louder and faster. Any ideas?

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Old 07-21-2011, 06:54 PM   #2 (permalink)
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Welcome to the forums...Free downloadable manuals in the Schematics/Manual help section in the Technical discussions ...Did you check the timing chain,and adjuster while you had it apart??? Maybe there's an exhaust leak???
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Old 07-21-2011, 07:02 PM   #3 (permalink)
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how did you adjust the valves? when you installed the cam did you put it in lobes down? it's possible you adjusted them on exhaust stroke
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Old 07-21-2011, 07:33 PM   #4 (permalink)
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Welcome to the forums.
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Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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Old 07-22-2011, 03:01 PM   #5 (permalink)
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Valves are adjusted to spec. My brother is the one doing the work and he can't figure out why it would be tapping the way it is. No exhaust leak and the timing chain,and adjuster are good. Any other ideas on what could be causing it?

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Old 07-22-2011, 03:09 PM   #6 (permalink)
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It won't hurt to adjust them again on the off chance he missed something,or did them wrong...
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Old 07-22-2011, 03:10 PM   #7 (permalink)
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Does it make any popping out of the exhaust,or carb/airbox at idle,kinda quiet popping noise???
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Old 07-22-2011, 03:28 PM   #8 (permalink)
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The noise comes from the engine itself. The top end. It gets louder and faster as you accelerate. At an idle the tapping is pretty quiet.
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Old 07-22-2011, 04:02 PM   #9 (permalink)
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Did you put a stock cam back in???The easiest way I can explain how to adjust the valves on a 250X is remove the spark plug, the side plugs on the stator cover take a 17mm socket and put in the larger hole rotate the engine counter clockwise until you allign the "T" mark with the notch in the little hole. Grab the exhaust rockers and wiggle them remember how loose or tight they were now rotate the engine 360 and allign the "T" again check the rockers, which ever way they were the loosest is TDC Compression stroke. make your adjustments there. a tight .004 int and exh. Make sure you do this with a cold engine. or you will get an inaccurate reading.
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"MOOSE WAGON "
91 TRX250X aka "MOOSE WAGON"
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
00 TRX350TM 4X2 (Resale bike)
01 TRX250EX (TLC Needed)
74' CB360 (future FrankenQuad)
Work in progress

JETTING

MOOSE_WAGON_makeover

2000_Rancher_build
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Old 07-22-2011, 04:16 PM   #10 (permalink)
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Would be nice if you knew whether the cam is stock,or not/what brand,and grind it is as most aftermarket cams call for different valve lashes than an oem stock cam...
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