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Choke issues on a 08

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ok i cant start my crf with the choke on at all as in no chance of it firing but if i hold the hot start in it will fire within a few minutes but still hard to start cold, when it is warm it has no problems starting with the hot start in.

i live in north west Australia so its quite hot and about 1700ft above sea level, can anyone help as i dont understand carbs to well and any jetting info would be good to cheers..

oh yeah bike is stock..

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ok i cant start my crf with the choke on at all as in no chance of it firing but if i hold the hot start in it will fire within a few minutes but still hard to start cold, when it is warm it has no problems starting with the hot start in.

i live in north west Australia so its quite hot and about 1700ft above sea level, can anyone help as i dont understand carbs to well and any jetting info would be good to cheers..

oh yeah bike is stock..

Its waaayy to rich for that temp & alt standard...What temp & humidity is...

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If you still have the stock 188 main in there, it's too rich. In our 08, even with the cold temps in Ohio, I'm running a 42 pilot and a 172 main with the mixture screw out 2 1/4 turns. It still starts with the choke off, but because of the cold weather, I'm afraid to lean it out anymore. Once it's running, he pulls the choke out for a minute or so. This seems to be pretty consistent with all the 08's.

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its about 35 deg C and it is quite humid at the moment, after i start the bike it seams to run fine, I pulled it apart yesterday and did valve clearances and there sweet but the plug is a bit on the black side, with saying that it doesn't seam to pop or run badly its just hard to start with the choke on

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If you still have the stock jetting, start by dropping the main down to a 175. As I said, the 188 is way too rich. Your pilot should be a 42 if it is still stock. You'll be suprised at the performance gain. I'd bet that you will probably end up with a 170 or 172 main when its all done. When it warms up to around 70 degrees F, I run a 42 pilot and a 168 main. Never had any problems running lean. If you have a bog issue, pick up an adjustable leak jet. Around $100 and well worth it!

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cheers mate i will give it a go today and i will let you know cheers

Excellent! Let me know how it does...:p

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ok i put in the 175 main and a 40 pilot jets today and went for a ride doesn't seam to lean and seams a bit more on the punchy side of things do you think that will be sweet?

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ok i put in the 175 main and a 40 pilot jets today and went for a ride doesn't seam to lean and seams a bit more on the punchy side of things do you think that will be sweet?

If I were you, I'd play around with the main a bit more. I've mostly used the 172 on top. Keep an ear open for it to start popping. If that starts to happen, you know you're getting a bit on the lean side. If you have a 42 pilot, give it a shot and see how it feels with it. Also, how far out is your mixture screw?

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I have this same problem here in ohio as well. Bike is incredibly impossible to start when cold! choke doesnt work when cold and am running a 172 as well. its a honda deal :p

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Same problem here - No start with the choke on. It is totally nice otherwise. It has done this since day 1. My 06 never had this problem. I wonder if the decompresson mod will make a difference. I may have to try it.

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The fuel screw is 1 1/8 turn out (stock), i am going to get a fuel mixture screw for it so i can play around with it some more, i'm starting to read up on jetting and i think i am starting to understand it.

The bike feels better with the new jetting now but i will keep an ear out to see if it is to lean but it seams more respnsive.

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Same problem here - No start with the choke on. It is totally nice otherwise. It has done this since day 1. My 06 never had this problem. I wonder if the decompresson mod will make a difference. I may have to try it.

The decompression mod won't make a difference on the cold start issue. Our 08 is the same way along with most of the others with the cold start choke issue. I did the decompression mod and it definately made it easier to start, but no difference when it was cold. The 06 we have is totally different. 2 blips with the choke on and it fired right up. Most 08's are just a bitch to start. Bring on the e-start button!:p

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The decompression mod won't make a difference on the cold start issue. Our 08 is the same way along with most of the others with the cold start choke issue. I did the decompression mod and it definately made it easier to start, but no difference when it was cold. The 06 we have is totally different. 2 blips with the choke on and it fired right up. Most 08's are just a bitch to start. Bring on the e-start button!:p

Why doesn't anyone just sell a deccompression part as aftermarket that is the mod?

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Why doesn't anyone just sell a deccompression part as aftermarket that is the mod?

Good question.

It's real simple too do. Think of it as a camshaft. You don't want to lower the lift on the lobe, you want to shorten the duration of time it opens and closes the valve.

I think it was Ron Hamp who posted a nice drawing as to how it's done with some measurments and instructions.

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