Trouble with cold starting

[Shorty_925]

Im having trouble with starting my bike('07 YZ450F). The only way it seems to start if I do:

Choke, clutch in, put into gear, pull the decom. in and then kick. Do a couple of kicks, take it out of gear, and then just kick it over with choke, decom. and out of gear and seems to fire up after following this. If I dont sort of follow this it wont start. Anyone got some ideas as where I could start to find out why it isnt starting straight away? Something im doing wrong? Other people have the same problem with this bike?

[Taz]

I found with my YZF that giving it one or two twists of the throttle before kicking help to fire it up in 1-2 kicks.

[barty5]

Im having trouble with starting my bike('07 YZ450F). The only way it seems to start if I do:

Choke, clutch in, put into gear, pull the decom. in and then kick. Do a couple of kicks, take it out of gear, and then just kick it over with choke, decom. and out of gear and seems to fire up after following this. If I dont sort of follow this it wont start. Anyone got some ideas as where I could start to find out why it isnt starting straight away? Something im doing wrong? Other people have the same problem with this bike?


That lever on your bars is not a decomp the 450s have a auto decomp set up built in to the exhaust cam. Your pulling in the hot start which will not help at all with cold starting.

[Shorty_925]

so starting in neutral with the choke, i dont need to worry about the hot start?

[barty5]

so starting in neutral with the choke, i dont need to worry about the hot start?

Yup leave the hot start and throtle alone in neutral As the neutral switch can be pain if in gear.

[B0000M]

typically first start of the day / cold starting, youll need to use the choke, and give the throttle 2 or 3 pumps. there is literally a pump which squirts fuel thru when you give the throttle a twist.

every bike ive ridden with a hot start, you only need to use the hot start when you've really been raping it and it gets quite hot- eg racing. never needed it on a trail

i cant see how the putting it in gear method is helping you other than making you more tired (assuming your clutch sticks a little bit when its in gear like everyone else does)

[barty5]

typically first start of the day / cold starting, youll need to use the choke, and give the throttle 2 or 3 pumps. there is literally a pump which squirts fuel thru when you give the throttle a twist.

every bike ive ridden with a hot start, you only need to use the hot start when you've really been raping it and it gets quite hot- eg racing. never needed it on a trail

i cant see how the putting it in gear method is helping you other than making you more tired (assuming your clutch sticks a little bit when its in gear like everyone else does)

might have a ify neutral switch as a possiblity wouldnt think so tho i never use any gas with mine 3-4 kicks with choke is all normally

[B0000M]

might have a ify neutral switch as a possiblity wouldnt think so tho i never use any gas with mine 3-4 kicks with choke is all normally

do yzf's have neutral switches?

[barty5]

do yzf's have neutral switches?

yeh there is a switchy thing there ie wiring comin out very switch lookin mine hate/ wont start in gear just checked on line and yes they do

[Shorty_925]

Cheers guys. Yea I dont know myself why putting it in gear seems to help, just has worked so go with it. This is the first 4-stroke ive had so finding bits and peices about it and how it works. Thought it was partly due to the cold weather as well that it hasnt been easy starting. I use the choke whenever its the first start of the day but doesnt seem to be enough sometimes, just keep on kicking the damn thing with nothing happening, but will try your methods, so thanks again.

[laserracer]

try pulling the choke out 2 twists of throttle and some short rapid kicks of the kick start then when it fires 1 good full kick

[CookMySock]

Anyone else wondering what the hot-start lever does? (like, inside the engine) And how does this make a hot start easier or more reliable?

Steve

[barty5]

Anyone else wondering what the hot-start lever does? (like, inside the engine) And how does this make a hot start easier or more reliable?

Steve

It opens a valve in the carb which allows a shot of xtra cool air to bypass the carb guess the xtra O2 helps with combustion

[CookMySock]

It opens a valve in the carb which allows a shot of xtra cool air to bypass the carb guess the xtra O2 helps with combustionAhh ic. Blardy hell I can see why that would make a cold start a problem.

Steve

[buffstar]

My bike is a bitch to start on a cold morning......partner reckons the fuel freezes in the lines when its on the trailer heading to a ride (wind chill factor etc) I usually combat this by starting it at home in the gge first to warm up while I hook the trailer up etc.
Another issue with starting was the valves - they get gunked up or something.......pffft fk i know, Greg from spectrum has tootooed with it for us and it starts much better now.........

Good Luck. - lol sucks being that person who kicks n kicks n kicks in the carpark:no:

[B0000M]

i have another sure fire solution to this problem, but aparently everyone is sick of hearing it.

[barty5]

i have another sure fire solution to this problem, but aparently everyone is sick of hearing it.

Yes we are so fuck off politely with your hondas and 2strokes hahahahahaa

[camchain]

i have another sure fire solution to this problem, but aparently everyone is sick of hearing it.
HeHa. Solid. At least we can count on your complete reliability Boooom.

[B0000M]

Yes we are so fuck off politely with your hondas and 2strokes hahahahahaa

wasnt even going to mention honda in this one!

[flyingcr250]

i have another sure fire solution to this problem, but aparently everyone is sick of hearing it.

ha ha ha keep fighting the good fight:2guns:

[barty5]

wasnt even going to mention honda in this one!

10 char.........

[noobi]

petrol freezes below -100 degrees C, so its not frozen fuel. year 12 chem ftw

[sxyrx7]

every 4 stroke i have seen has a trick to starting it hot and cold.

i ride with two honda's same model etc but each had a different was of starting

just need to find what works best for your bike.

or get one of these

136272

[B0000M]

.

or get one of these

136272


a road bike? probably get real tiring out on the trail with the lack of suspension

[Rupe]

a road bike? probably get real tiring out on the trail with the lack of suspension

think he means electric start brains.

[Rupe]

Im having trouble with starting my bike('07 YZ450F). The only way it seems to start if I do:

Choke, clutch in, put into gear, pull the decom. in and then kick. Do a couple of kicks, take it out of gear, and then just kick it over with choke, decom. and out of gear and seems to fire up after following this. If I dont sort of follow this it wont start. Anyone got some ideas as where I could start to find out why it isnt starting straight away? Something im doing wrong? Other people have the same problem with this bike?

just a thought but is he fuel draining out of the carb, and when you turn the tap on to start it it hasn't filled?

[Shorty_925]

Not too sure to be honest. I take it thats where twisting the throttle a few times to fill it up?

[Rupe]

Not too sure to be honest. I take it thats where twisting the throttle a few times to fill it up?

No I never touch the throttle, and don't know why you would.

[Shorty_925]

Someone mentioned it earlier, giving it a couple of twists on the throttle.

[mowgli]

Someone mentioned it earlier, giving it a couple of twists on the throttle.
Sounds like a book I several times read. Twist of the Wrist by Keith Code. Not much help with cold starts but plenty of useful advice about motorcycling.

[Rupe]

Someone mentioned it earlier, giving it a couple of twists on the throttle.

Make sure it's not in gear, turn the fuel on, pull the choke out. Then push the kick starter to top dead center with your foot, let the kickstarter return to full height. Put some weight behind it and push (not stab) right through the stroke, smooth and hard. repeat that from TDC and I bet it fires after a couple. Don't bother with gears, throttles, and hot starts from cold.

[buffstar]

petrol freezes below -100 degrees C, so its not frozen fuel. year 12 chem ftw


Cool, thanks for that - learn something new every day.......shall now be able to use that info for future discussion with partner re: my bike, heh heh heh :shifty:

[oldguy]

try pulling the choke out 2 twists of throttle and some short rapid kicks of the kick start then when it fires 1 good full kick Tried it on my bike, it's been sitting in the workshop for about 3 weeks and hasn't been started, it's always been a prick of a thing to start first off, so when i got to work, yeah give it a go, first kick:2thumbsup
would do everything except twisting the throttle.
I always thought it was a F**king Suzuki thing.

cheers mate, i lean't something new today

[Zuki lover]

Put a new spark plug in it

[B0000M]

Put a new spark plug in it

oh look, a road biker with no idea has gotten lost again

[Shorty_925]

Make sure it's not in gear, turn the fuel on, pull the choke out. Then push the kick starter to top dead center with your foot, let the kickstarter return to full height. Put some weight behind it and push (not stab) right through the stroke, smooth and hard. repeat that from TDC and I bet it fires after a couple. Don't bother with gears, throttles, and hot starts from cold.

Cheers for that. Thought didnt have to do TDC anymore on the newer models..? Will try and remember the run down to getting it started on the weekend.

[vr4king]

Put a new spark plug in it

They sell these special "plugs" at the local lets stop and eat 5 pies pub?

[evoetr]

That lever on your bars is not a decomp the 450s have a auto decomp set up built in to the exhaust cam. Your pulling in the hot start which will not help at all with cold starting.

Yea my 03 yzf450 has auto decomp and a hot start lever although everyone kept saying it was decomp lever even the shop i got it from until i got my hands on a Yamaha manual! ...Ahh says hot start lever LOL...... did get some good advice when starting and got it down to 2 kicks on a good day...

Push the kick start down slowly and lightly.... until it hits a hard patch normally half way down....... then let it all the way up and kick it like you have never kicked before lol and repeat...

Also another thing that works if i open the choke (When cold) and turn the fuel on leave it, like go and get my gear come back it will normally kick over sooner. Don't know why and don't really care lol...

Also does say in the Yamaha manual if its going to be parked up for a while like a month or two, poor teaspoon of engine oil (Same grade as what goes in the bike) down the spark plug hole and put the plug back in. In a month or so kick it and should start 2-3 kicks... im guessing it would smoke for like first 5mins burning that oil.. but if its in the manual can't be bad for it

Yes Genuine Yamaha Manual

[laserracer]

Tried it on my bike, it's been sitting in the workshop for about 3 weeks and hasn't been started, it's always been a prick of a thing to start first off, so when i got to work, yeah give it a go, first kick:2thumbsup
would do everything except twisting the throttle.
I always thought it was a F**king Suzuki thing.

cheers mate, i lean't something new today

Thats cool usually works, had a young guy at the track last weekend at the cambridge mx that just couldnt start his honda 250 f from cold ..showed him this trick and he was so happy never missed a start all day

[Bradz]

Ive been having problems starting mine lately when its really cold, trick ive found is turn gas off,put it on its side drain the carb bowl, kick it with choke and away she goes... weird:confused:

[laserracer]

Yeah thats a old xr trick someone tried that with the young guys 250f but still wouldnt go