Hot starting - Kawasaki KFX450 Forum

mx333 · 02-05-2009, 11:17 AM

I have a 08 kfx 450 and it's so hard to start when it's hot or even gets warm. The machine runs great and starts everytime when cold. I have adjusted the inrichner all the way in and out and makes no difference. I have hot cams, 13.5 cp piston,+2 tb,fuel customs intake,yoshi pipe,porting and a dobeck fuel controler. I was told you have to adjust the tps?? If so how what are the reccomended settings , Thanks Skyler

offroadhunter · 02-05-2009, 11:24 AM

TPS....get it checked....I had the same issue (as well as many other people), the voltage is probably off, I had mine changed and it starts every time nomatter if its hot or cold.

Jeff B · 02-05-2009, 05:42 PM

Set it at .62 volts

dittrich · 02-05-2009, 06:06 PM

i am having same starting problems. i have a pcIII is there anyway to adjust the tps on there? not that great at using it? also who does a good job boring throttle body for reasonable price. anyone do cores on them where my bike don't have to be down?

Jeff B · 02-05-2009, 08:37 PM

QUOTE (ditt08 @ Feb 5 2009, 06:07 PM)

Quote:

i am having same starting problems. i have a pcIII is there anyway to adjust the tps on there? not that great at using it? also who does a good job boring throttle body for reasonable price. anyone do cores on them where my bike don't have to be down?

You can not adjust the tps with the pcIII. There is directions on here somewhere on how to do it,or it might be on HQ.
If you can't find it pm me your email and I will send them to you.

lviki · 02-06-2009, 12:10 AM

QUOTE (Jeff B @ Feb 5 2009, 05:38 PM)

Quote:

You can not adjust the tps with the pcIII. There is directions on here somewhere on how to do it,or it might be on HQ.
If you can't find it pm me your email and I will send them to you.

I have foundd the flyweights on the decompression valve on the exhaust valve is the problem the are not kicking out soon enough, the engine can't turn over fast enough so I found added some weight to the flyweights and adjusting the resting stop on the weights fixed all my problems, and I have done this on other bikes with the same problem.

mx333 · 02-06-2009, 12:17 PM

QUOTE (Jeff B @ Feb 5 2009, 06:43 PM)

Quote:

Set it at .62 volts

How would i do this. I am new to the intire FI thing ? lol

mx333 · 02-06-2009, 12:18 PM

QUOTE (king Sandman @ Feb 6 2009, 01:11 AM)

Quote:

I have foundd the flyweights on the decompression valve on the exhaust valve is the problem the are not kicking out soon enough, the engine can't turn over fast enough so I found added some weight to the flyweights and adjusting the resting stop on the weights fixed all my problems, and I have done this on other bikes with the same problem.

Oh the motor spins over plenty fast to start it trust me. I realy think it's the tps thing.

ononewheel · 02-06-2009, 03:30 PM

COULD BE YOUR VALVES NEED ADJUSTING?MOST LIKELY THE EXHAUST VALVES THEY HEAT UP MORE AND COULD BE STAYING OPEN WHILE YOUR STARTING IT WHILE THE BIKE IS HOT!CHECK YOUR CLEARANCES!

mx333 · 02-06-2009, 07:44 PM

QUOTE (ononewheel @ Feb 6 2009, 05:31 PM)

Quote:

COULD BE YOUR VALVES NEED ADJUSTING?MOST LIKELY THE EXHAUST VALVES THEY HEAT UP MORE AND COULD BE STAYING OPEN WHILE YOUR STARTING IT WHILE THE BIKE IS HOT!CHECK YOUR CLEARANCES!

Motor just got built and the valves are spot on. It's something to do with the efi i know it just don't have any idea how to fix the d**m thing

02-05-2009, 11:17 AM	#1 (permalink)
mx333 Member Join Date: Nov 2008 Posts: 40	I have a 08 kfx 450 and it's so hard to start when it's hot or even gets warm. The machine runs great and starts everytime when cold. I have adjusted the inrichner all the way in and out and makes no difference. I have hot cams, 13.5 cp piston,+2 tb,fuel customs intake,yoshi pipe,porting and a dobeck fuel controler. I was told you have to adjust the tps?? If so how what are the reccomended settings , Thanks Skyler __________________ 2008 Kfx 450 Roll long travel with Fox Floats Roll +2 stem with Fasst bars Lonestar Axle Hiper Whels With quadcross mx tires& douglous and maxxis for worcs Roll pegs,roll nerfs,roll heel guards Yoshi Pipe Fuel intake Dobeck programer Bored Tb LMR Porting Hot cams 13.5:1 cp piston Richochet skid plates More to come

02-05-2009, 05:42 PM	#3 (permalink)
Jeff B Member Join Date: Mar 2008 Location: Lansing,MI Posts: 56	Set it at .62 volts __________________ KFX 450 PCIII Dasa 13" Fuel atv intake

02-06-2009, 03:30 PM	#9 (permalink)
ononewheel Senior Member Join Date: Dec 2008 Posts: 418	COULD BE YOUR VALVES NEED ADJUSTING?MOST LIKELY THE EXHAUST VALVES THEY HEAT UP MORE AND COULD BE STAYING OPEN WHILE YOUR STARTING IT WHILE THE BIKE IS HOT!CHECK YOUR CLEARANCES! __________________ 2009 monster energy kfx 450r dasa/pc3/fci/kx cams/fox floats/elka rear/hydrolic clutch/lsr stem+carrier+adjustable axle/houser mgc +2.25 a arms/hids/itp hd tires/hiper tech 3's front/rear/pro armor swingerskid+nerfs+heal /guards+footpegs/odi grips/asv levers/ims3.7gallon gas tank/cv4 green hoses/alba case saver/tag polyurithane belly skid/15fs 36 rs

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02-05-2009, 11:24 AM	#2 (permalink)
offroadhunter Senior Member Join Date: Oct 2007 Location: Anthem, AZ Posts: 637	TPS....get it checked....I had the same issue (as well as many other people), the voltage is probably off, I had mine changed and it starts every time nomatter if its hot or cold.

02-05-2009, 06:06 PM	#4 (permalink)
dittrich Junior Member Join Date: Aug 2008 Location: Escanaba MI Posts: 24	i am having same starting problems. i have a pcIII is there anyway to adjust the tps on there? not that great at using it? also who does a good job boring throttle body for reasonable price. anyone do cores on them where my bike don't have to be down?

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