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WR450F 2012 FI

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Starting issues

I have recently purchased nov 2016 WR450F with 900km odometer

Looks brand new

On my first weekend riding on the 2nd day was hard to start when warm, off key or Kickstart

Would roll or clutch start reasonable

Got the bike home and checked it over, did a service, oil, filter, checked valve clearance all ok.

Found air filter starting to disintegrate thinking that was the problem and hoping that dirt had not entered engine.

Next ride similar problem.

Did research bought gtr tuner and yamaha diagnostic tool and adjusted idle co

Rode again still similar problem

Kickstart was difficult to kick , electric start felt like seized , but would clutch start.

Pulled top end / cylinder /piston down thinking that possibly dirt had caused issue, or cams were tight or ?? But found everything in good order apart from timing chain slightly still and some wear on cam gears but didnt think was enough to worry about

Changed oil and filter again

Also removed starter checked brushes and was ok

My questions are

Has anybody had similar issues

Is there something that can seize in starter or Kickstart areas. Is there something in gearbox that can cause this. My next step is to pull motor out and dismantle.

Just looking for suggestions before doing anything ??

The fact it now has 1100km is concerning

Oil check plug removed shows oil coming out when running

I am a motor mechanic and have pulled many two strokes down over the years

Wayne

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Have you:

- derestricted the intake and exhuast

- changed to the gytr ecu

- removed the throttle stop

If you have not done these things, it will run very hot, and start poorly. It is not designed to actually be ridden stock; it's just for EPA compliance.

Thousands of posts on the subject 'uncorking', so do a search.

After you do that, you might need to also adjust the CO levels at idle. This requires a Yamaha FI tester to make the adjustment. Not every bike needs it.

Hundreds of posts on 'hard starting FI' so do a search.

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Kramnie
Obviously you have not read my post just glanced

Yes have changed co idle setting
Australia does not
Require replacement ecu can be changed with Yamaha tool
Yes i have looked thru forums
This is a different question


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14 minutes ago, Broady Automotive said:

Kramnie
Obviously you have not read my post just glanced

Yes have changed co idle setting
Australia does not
Require replacement ecu can be changed with Yamaha tool
Yes i have looked thru forums
This is a different question

 

Yes you are correct, sorry.

So, if the issues is hot only starting troubles, I would guess that to be a closing valve, or a clogged fuel filter in the FI pump system.

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What did you set the CO number to.  did you trial and error it till you found the best setting or just copy somebody's number?

 

Each bike is individual,  try different numbers,  positive and negative.  When I did mine I went and did -30, -20, -10, 0,  10, 20 , 30  and it was pretty good at both -20 and -10.   split the difference for -15 ,  tried that and the -20/-10 split again and ended up at -12.   My bike will start,  hot/cold/in gear/neutral doesn't matter push the button and it fires.

IIRC in the big FI CO setting thread there was a " best number " thrown out and it was 8,  my bike won't hardly start with 8 put in.

Also check the voltage on your battery.   if it's original and the bike had 500 miles on it from new in 2012,  it's probably shot from sitting.

 

They will occasionally stop right at TDC and when you press the button it'll seem like it's locked up,  if you get this drop it in 2nd and push the bike forward with the clutch out to move the piston off TDC,  the button will work now for starting.

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Thanks for the replies
The post has been misunderstood
The engine will not crank easy seems too tight to turn by the starter or Kickstart did initially start on starter but now only clutch start
Co settings were set using a gas analyser
Battery is near new

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I have now removed cam chain and lh side crank cover which includes starter
Motor spins freely with no cam,chain or spark plug
My concern is the wear on crank and cam gear sprockets and the fact the cam chain is stiff - hard to describe but kinks easily when removed ie links are tight
Difficult to take a decent photo with phone
My questions are
Is it normal to have such wear on gears where chain runs
Is it normal for chain links to be tight
For a bike that has done 1200kme70bbad9591bdf7c32a4b9f3f0f27466.jpg

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No that is not normal.

It almost looks like you didn't bother to retract the cam chain tensioner when you put it back together and then let it spring back out.

Looks like it has destroyed the gears and cam chain.  

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3 hours ago, Broady Automotive said:

It has only done 1200km since new
Was like this when I first pulled it apart so either yamaha or previous owner

All it takes is getting some water in the motor, or leaving it outside for an extened period.....or a jacked up tensioner.

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Re wr450f 2012
Just a update regarding the fix
Ended up doing genuine crank
Aftermarket Hotcams
New piston and chain/ tensioner
Big job to split cases but took my time to make sure that it was done properly
New starter motor
Starting issues are fixed
Goes well
The chain must have been causing each link to be tight hence the difficulty to get enough cranking speed
Thank you all for the advice

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Re wr450f 2012
Just a update regarding the fix
Ended up doing genuine crank
Aftermarket Hotcams
New piston and chain/ tensioner
Big job to split cases but took my time to make sure that it was done properly
New starter motor
Starting issues are fixed
Goes well
The chain must have been causing each link to be tight hence the difficulty to get enough cranking speed
Thank you all for the advice

Which starter motor did you buy? Oem or aftermarket?
Thanks
Paolo

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