My 05 crf 450r will not idle when I turn off the choke it also is backfiring and poping when I give it gas . Could it have something to do with the hot start cable ?

Where is your mixture screw set to?

did you foul the plugs , this is something that happens all the time when you have a hand choke on something , when it gets cold out you are going to need more choke, the best thing to do when it is cold is to warm it up do not just take off because you always leave the choke on and foul the plugs, warm it up leave it alone , do not fix something that is not broke

Air leak? Dirty air filter? Check choke cable make sure it's functioning properly in on off positions.,.., then on to fuel is it getting enough.,could need adjusting/ jetting

It may still have some water in the tank/system or the spark plug is no good.With a full tank of fuel,add 200ml of methilated spirits.It breaks up any moisture and lets it burn away.Also,with the motor out of gear,run the bike at higher revs and close the choke fully on and give full throttle at the same time.When the motor starts to die,flick the choke off.This can sometimes unclog a carby jet that may be slightly blocked because with the air choked,it gives a sudden **** off fuel.This may/maynot fix the bike but it the 1st thing to try before paying a dealer and it can't hurt anything.Hope this helps you

sounds like its time to adjust those valves to me 0.003-0.004 on the filler gage or have done at shop.

The reason your carburetor overflows is not from an incorrect adjustment, but because the float valve is hung open by dirt or some other foreign debris. Turn the petcock off, then locate the drain screw on the bottom of the bowl and drain the fuel out. Then turn the petcock on again - and check for overflowing. If the overflow continues, the you will need to remove the float bowl, the float and float valve - clean each and reinstall to fix the problem.

There is a proper way to start an engine. Most bikes have four controls to assist in starting.

• The choke, used when the engine is cold. Pull the red knob for choke.
• The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
• The de-compression lever, always used.
• The throttle, used to prime the cylinder.

Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. Go ahead and give it another primer shot after the 5th kick attempt. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

Think about the valves. If they are to tight (Valve clearance) with the heat added when warm, they (Or one) might not close. I'd check there first.

Best place to start looking would be ebay or you local motorcycle salvage yard.

Hi and welcome to FixYa,

Initially, backfiring is a spark/timing issue or contaminated fuel (water) or as you stated stale fuel. AVGas would not result to backfiring but rather a stronger pull though would heat up easily.

Good luck and Thank you for using FixYa. Happy Holidays.

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