'07 Kick Starting Troubles

the bike has been out about 20 times, last time I rode was three days ago... today, full tank of gas, turned on gas, pulled choke, and kick started for about 20 - 30 pumps:banghead: FYI. Tried to pull the hot start lever in just to see if bike thought that engine was already hot enough (that didn't work either.)

Ended up jump starting by running down and poppin' in 1st gear, warmed for 2 - 3 minutes and no probs after.

I live in Phoenix where temp reached 110 today, suspect the garage was about 120'ish. You think the heat has any effect on the YZ450f kick start? Or, is my technique not correct because used to starting a 2-stroke 250?? Answers...

gas on

choke on

twist throttle twice (but for your HOTasssstemps maybe once)

kick solidly all the way through....

ya..make sure that u take the slack out in the kick starter..kick from the highest point u can..that seems to do it for me

another thing, do not twist the throtle while you kick at all like you would to a 2-stroke.

But, whens the last time you checked your valves? Im no mechanic at all, but my friend had to bumb start his rmz, he said it was because his valves where out of spec, but hey, hes no mechanic either. And i highly doubt a 07's valves would have any issue, especially a yamaha's.

the last time valves were check'd; when the bike was inspected and tested about 2 weeks ago... i think pulling throttle once and then pumping lever AND my technique also probably still used to the 2-stroke, quick fire, pump... Bike seems to work super sweet ~ just need to personalize myself with it. I would recommend anybody else buying one! Got my off ebay, brand spankin' new '07 Yz450F, for $5,400 (pics to come...)

sweet deal man! got my 03 for $1600..love this thing!

shim your valves, or get new ones. thats the first sign of needing to shim or get new valves.

shim your valves, or get new ones. thats the first sign of needing to shim or get new valves.
I would say, that while this is true in general, that would be extremely unlikely in this case:
the bike has been out about 20 times
I would say, that while this is true in general, that would be extremely unlikely in this case:

My thoughts would be bad fuel causing the problems.

My thoughts would be bad fuel causing the problems.
Could well be.

Cool. That video worked. I dont need to punked anymore how to start a bike. thanks for helping...

so, after viewing the video, I have a better understanding of the procedures to start my YZ450f. BUT, i still notice that double pumping throttle, finding the compression point, etc that the bike just doesn't start within the first 10 - 15 pumps.

I've noticed, giving it just a smigggin' of throttle on the start helps get it going with no probs after. Giving the teenniieee little bit of throttle bad?? You think the Pilot screw would be the next move to adjust? (its a new bike! 15 - 20 rides to give an estimate)

I've noticed, giving it just a smigggin' of throttle on the start helps get it going with no probs after. Giving the teenniieee little bit of throttle bad?? You think the Pilot screw would be the next move to adjust? (its a new bike! 15 - 20 rides to give an estimate)
If cracking the throttle slightly makes it start, then do it. My '03 is like that.

In any case, you need to adjust your pilot screw for any significant change in altitude/weather.

I haven't been riding for a while, but I've been starting my bike a couple of times a week. Now I'm having a hell of a time getting it started also. I have fresh gas in, and a fresh plug. I don't have many hours on it either. I just changed the flywheel and tank, but it started right up after the changes. I think I'm flooding it when I first try to start it, any thoughts? :banghead:

Starting it up a couple times a week is probably the source of your problems. If you fail to bring the combustion chamber and oil up to full operating temperature, you contaminate the oil with fuel, and degrade the spark plug each time you do it.

Starting it up a couple times a week is probably the source of your problems. If you fail to bring the combustion chamber and oil up to full operating temperature, you contaminate the oil with fuel, and degrade the spark plug each time you do it.

Thanks.

I just installed a Zip Ty hot start nut, so I pulled the new plug, kicked it over a few times to make sure there was spark, put back together, fired right up. I just need to ride the hell out of it after it's been sitting.

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