Just bought a trx450r about a week ago. It started fine, test drove it got it through all the gears etc. I put my hand on the exhaust before he started it so I know he didn't have it warmed up on me. Well I get it off the trailer go about 300feet pull in the clutch downshift and it dies. I can't get it started since. I put the battery on a tender overnight and still nothing. Bought a new plug and also cleaned the injector. Its getting fuel and spark but still nothing. It backfires when starting sometimes. I cant figure it out
Fuel and spark still won't start
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Clarify? did you buy a TRX450 or a KFX450 & what year...??
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OK!
So it ran fine motor cold when you rode it & started to warm up it quit running...?...common valve clearance being too close of gap..
Check & adjust your valve clearance...
Valve Clearance: between cam and valve lifter
Standard:
Exhaust 0.17 ∼ 0.22 mm (0.0067 ∼ 0.0087 in.) best at 0.21mm
Inlet 0.10 ∼ 0.15 mm (0.0039 ∼ 0.0059 in.) best at 0.14mm
Valve clearance is in range & the symptoms continue...?
Is your ECU OEM/stock or a Procom...? OEM see picture
Does your KFX have any modifications...?..List your mods...Like fuel controller, cams, full exhaust, Fuel custom intake
With a stock ECU...Does your F.I dash light remain ON or flashing when trying to start...?..If yes...it stays on & doesn't turn off after 3 second..
Check for error code...orange wire in black pouch by the headlights..see pictures
Make sure your battery is fully charged...12.8v standard...!!
Make sure your throttle cable has a little bit of slack to fully close to idle position...!!
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Ended up buying one these PSR® - Camshaft Chain Tensioner ... Tbh something like that is way over my head. I'm just going to have my dads friend look at it. He use to own his own ATV repair business in a town kinda near me.
He's not getting back to me so I might attempt to do it myself. Anyone have a diagram or instructions? I've changed a timing chain on my car before so it can't be much more difficult then that. my email is [email protected]
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I sent you the service manual...check your spam/junk folder...!!!
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Here's the cam chain diagram
Valve Clearance: between cam and valve lifter
Standard:
Exhaust 0.17 ∼ 0.22 mm (0.0067 ∼ 0.0087 in.)
Inlet 0.10 ∼ 0.15 mm (0.0039 ∼ 0.0059 in.)
If the valve clearance is not within the specified range,
adjust it.
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I ordered a new chain as well just to be safe. Who knows if the old one stretched or not. When I took the valve cover off the chain seemed pretty tight thought? Looks like it should be here this weekend. I actually got a service manual. Thx though man appreciate your help!
Alright so I took the stator off and it looks like one of the wires are bad? I know on cars the crankshaft position sensor pulses to the ecu and ecu pulses back to keep the engine in time. Do you think the crankshaft postion sensor wire could have burned up and that's why it jumped timing? Timing chain guides look fairly new and chain is pretty tight on top and bottom. I wish I could just order the new wires for the stator. I cant seem to find them alone. Looks like Ill have to order a whole new stator
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the pulse coil/crank sensor can not cause it to jump time..But will cause an DFI error code & lock the advance timing into limp mode ...only a loose cam chain can cause it...!
Can you solder the wire together & isolate with shrink tube...??
Can you solder the wire together & isolate with shrink tube...??
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