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  #1  
Old 12-15-2005, 03:06 PM
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Default Hard to start 2006 TRX450?

Our 2006 TRX450 was IMPOSSIBLE to start no matter what the outside temperature is. We would crank away for 30 seconds or so and no dice.

Our TRX STILL does stall out sometime and then just cranks and cranks and cranks till the battery is dead, then we pull start it and it runs fine.
We cannot figure it out, must be an ignition or black box thing.

Hopefully, you already have the HMF adjustable needle, pilot and main jet that I suggest and have modded your airbox lid or removed it.

You will need to change and adjust a few things to get your 2006 TRX to make it start easier.

1) You will need to remove the carb and adjust the accelerator pump so that it squirts just after the slide opens. The AP adjuster is under the black cover on the side of the carb(a special tool will need to be made to turn the tamperproof "D" shaped adjuster, it is locktighted in place so do not try to pry it with a screwdriver or anything else).
2) You will need to change the leak jet from the #70 to a #50 or #40 (available from Yamaha).
3) Swap out the stock "D" shaped fuel screw for a SCOTTS "T" handle.
4) I added a Boyesen Quickshot AP bowl.
5) While I had the carb off I bypassed the micro switch at the throttle shft.

THERE now you have NO excuse not to get the holeshot !!!


Your TRX should now start better.

Last edited by hmfadmin : 03-30-2007 at 10:22 AM.
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  #2  
Old 12-18-2005, 10:33 AM
Tripyn Tripyn is offline
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Angry No starting

Thks for the info John,

I agree about the boyesen, I pulled it this weekend and had the tow line out more then once ( really sucked after smok'n his YFZ all day that he had to pull start me.) One thing, when you say bypass the micro switch, do you mean disconnecting it at the thumb throttle and sodering them together at the carb? I have read that somewhere else and they say it helps.
I can't wait to make this starting problem go away, makes it hard to do wheelies!
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  #3  
Old 12-21-2005, 08:59 AM
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REMEMBER you are removing a SAFETY SWITCH do so at your own risk!!!.

Bypass both micro switchs by eliminating them and connecting the wires together.
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Old 12-21-2005, 03:00 PM
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This is the leak jet located in the float bowl.
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  #5  
Old 12-21-2005, 03:03 PM
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This is the A/P adjuster (the black side cover on the carb has been removed)
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Old 12-21-2005, 03:05 PM
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Close up of the A/P adjuster.

Use a dremel and a narrow sanding disc and make a slot across the adjuster and outer collar, that way you can just use a screw driver to adjust the A/P

CAUTION: IF you are using a grinding wheel beware of sparks, the gasoline in the carburetor
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Last edited by motoz/HMF : 12-27-2005 at 04:37 PM.
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  #7  
Old 12-21-2005, 03:06 PM
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Add the Boyesen Quickshot and Scotts "T" handle fuel screw to finish the mods.
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  #8  
Old 12-21-2005, 03:09 PM
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Bypass this micro switch to prevent a future DNF.

NOTE: you are bypassing a safety switch, do so on your own and know that you are disabling a safety switch.
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Old 12-21-2005, 03:12 PM
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Now how easy is it going to be adjusting that fuel screw.
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  #10  
Old 03-07-2006, 01:11 PM
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The next valve chaeck you do make sure the decompression is set a tad loose, reports are that too tight causes hard starting.
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