OZ ATV :: The Australian ATV Forum

[feralkid]

Problems again. We have just put my bike back together but it won't start off the button. It just turns over once then stops for a bit, then another turn and then stops again for a bit. It just keeps doing that. If we tow start it, it starts fine and runs fine. I have just bought a new battery for it aswell and fully charged it and that didn't fix it either.
Anyone have a clue whats going on this time?
_________________
"If in doubt go flat out"
"Nothing worth having is easy to get"

[phil58]

Look for a bad earth??

[tbr926]

hi kid

i had the samething on a trx450er 07 which would only tow start
it had low to spark while cranking. turn out to be the stator fried its self.
not cheap fix, make sure you check valve clearances and decomp clearance as this a comon fault with the trx 450r.
and try a USA based yamaha web site and check their fault list

cheer dale

[feralkid]

Ok. Another update. We had done that cam mod when we rebuilt it so we thought that it might have been that, that was stopping it turning over because the auto-decomp wasn't opening soon enough so we turned it back to normal and it still won't work. I've had a look on a few US sites and have tryed what they said but no luck.
Anyone else know what the go might be.
_________________
"If in doubt go flat out"
"Nothing worth having is easy to get"

[Earthmover]

dose the starter actually work
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[feralkid]

Yeah. Forgot to add that when the plug is out it turns over fine but when you screw it in that is when it doesn't turn over properly.
_________________
"If in doubt go flat out"
"Nothing worth having is easy to get"

[doel#20]

id be double checking the timing again

[Noy Q75]

doel#20 wrote:

id be double checking the timing again

Check that and also what volt has the battery got when you push the button? i had the same issue when i had my motor done and my battery droped a cell so it would crank a little but under load it wouldnt do it . but it dose sound like the timming is out ? 180deg ?
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[feralkid]

Ok I will try the timing again tomorow changing the 180 degrees thing. Its definantly not the battery though because we have tried about 5 different batteries.
_________________
"If in doubt go flat out"
"Nothing worth having is easy to get"

[Noy Q75]

feralkid wrote:

Ok I will try the timing again tomorow changing the 180 degrees thing. Its definantly not the battery though because we have tried about 5 different batteries.

dont just change the timimg .check it out (take your time make sure its spot on) . coz if you get it wrong you will bend stuff inside the engine and that will cost $$$$ .. have you got the workshop manual. i put it on one of your other post a while ago check it with that.
_________________
Sponsors ,Cullys Yamaha,Pirtek Malaga
2x YFZ 450r "09" 2x 90 Raptor "09"2x 125Raptors "12"
N# 1 Aus Quad Nats Vets 2010
N# 1 at BSA-HD for 09,10,11
N# 2 W.A. State Clubman A 2010
N# 3 W.A. State Vets 2011
N# 1 W.A. State Vets 2012

[Clarkie]

Bring it up again and I will have a look again.
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Has turned to the Dark Side!

[feralkid]

Found out what it was. When the head was off one of the valve caps must have fallen off and the shim had fallen out. That was on the valve that the decompression pin works on. So we just made up a shim to see if that fixed it and it turns over perfectly now. So now I just have to take the home made one out and get a proper one from Yamaha and I should be right.
Thanks for the help anyway fellas.
_________________
"If in doubt go flat out"
"Nothing worth having is easy to get"

[tbr926]

bring back the adjustable rocker arms keeps all happy easy to adjust, or go the 2 banger haha

[ALBA450]

The same thing happened to me when i did my first rebuild myself. it took me a while to find out what was wrong after I changed the timing that many times.