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post #1 of 5 (permalink) Old 06-04-2019, 06:49 PM Thread Starter
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Hi I traded my honda 400ex for my dad's kfx450r and it has a hard start when it's cold but I think I have it figured out.

My reason for posting is I
found a weird looking wire that has a clear-ish plastic cap.
I searched the internet for hours but can't find anything.
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post #2 of 5 (permalink) Old 06-04-2019, 09:17 PM
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That's where all of the negative grounds tie together before going to the frame. Its not why...u either have a bad starter clutch or you have a weak battery/battery changing system and it doesnt put enough juice back into ur battery while riding.

There is one more possibility....the spring thats on ur exhaust cam is a compression release and its busted.

And hopefully its not a wire thats shorting out cuz that will be the hardest to find

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post #3 of 5 (permalink) Old 06-05-2019, 05:49 PM
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Hard start when cold is a sign of valves being out of adjustment.

Usually the Intake valves tighten

08 KFX450r- DASA, FCI, Stage 2 Hotcams, Wiseco Programmer, Procom, Dynatek Coil, 6K HID, 7" LED Light Bar.

Race Tech dual rate front springs, GT thunder XC Link and Race tech spring

Poly Case Saver, Streamline Stabilizer, Full PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, TRX Rear Hubs, IMS 3.7 tank
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post #4 of 5 (permalink) Old 06-06-2019, 11:09 AM Thread Starter
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Does anyone know what the most common hard start problem is?
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post #5 of 5 (permalink) Old 06-06-2019, 09:12 PM
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Originally Posted by Tking2770 View Post
Does anyone know what the most common hard start problem is?
Hard cold starting...Battery not fully charged 12.8 volts standard...Throttle positioning sensor is out of range..0.58~0.62 DCv @ throttle closed...

fuel map might need adjusting if you have a fuel controller

Hard starting with a hot motor common would be the valve clearance needs to be checked

Valve Clearance: between cam and valve lifter

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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