With idle adjuster pushing the throttle on a little bit, as soon as i use the throttle revs up to 4000 and stays ther. Without adjuster pushing on the throttle it will rev fine but dies when no throttle applied.
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Hey on the carburetor there is 2 mixture screws 1 is for idle up to 1/4 throttle the other is for 1/4 to full throttle the one for idle is closest to the engine. screw it all the way in then unwind it 1 turn. The screw the furthest from the engine screw it all the way in then unscrew it 1 1/4 turns Try to start the saw with just a little throttle. this setting is pretty standard. When you get it to idle then rev the saw and it cuts out as it returns to idle it's running to rich. Just adjust the screw in a little say 1/8 at a time. When it's to lean as soon as you throttle on it will stall. If you have no luck with this...you have a air leak from the carby gasket or the bolts are loose or a blocked exhaust
You have to adjust the idle cold,and hot. Warm the bbike up,and with the air filter housing off,look at the bottom right? of the backing plate,and there will be a small hole. There is a small torx bit screw in that hole that you will need to turn to adjust the hot idle. Dont quote me,but i think its a t20 or t25 torx bit.
I have the H model and set mine at one and a half turns out from stop. It waivers a little from summer to winter but only by a fraction.
As for the idle speed, when bike is warmed it will idle a little different to when cold and using choke.
Personal preference really, without a tacho fitted, I set it so she idles easy when cold. Once she's warm, idling is generally not used!!
To balance the two, warm engine and hold throttle at your optimum idle speed. Screw in idle adjuster until it engages base edge of carby slide. Release throttle and screw in/out fractionally to test if revs rise/fall. Set at optimum and then turn air mixture screw in/out till revs are highest (without using throttle). Then reset Idle screw back out to bring revs down to optimum level.
Tip, use a little thread seal on the idle screw as they have a nasty habit of unscrewing and leaving a hole in the side of your carby...sure fire way to lean right out and burn a hole in your piston when riding.
The timing is factory set and doesnt change, does it have the idle screw? I assume the one you adjusted is the air mixture screw at 1.5, you shouldnt adjust with the cable as it might cause the engine to rev on full lock, it needs a small amount of freeplay
Are you laying off the choke at any point? Full choke should only be used when starting a cold engine, it should run with no choke on full throttle. If there is not enough throttle i'd first try adjusting the tiny black screw on the carb beneath your air filter while you have it idling, letting the throttle have a little bit more room. If this doesn't work and you're running it properly than you may need to make some adjustments to the H L settings for your gas/air mix. This is also done while idling mind you and only with a clean air filter.
The air looks after itself when you operate he throttle. This how you adjust the fuel....There are two screws on the carby marked L and H. Turn these only 1/8th of a turn at a time. Start with H (high) with the saw at full revs. Turn anti clockwise untill you get max revs then turn it back a little bit. If its running too lean it will over heat the motor and damage it. Then if needed adjust the L (or Low)screw. If you get black or grey smoke when you push the throttle up from idle to full its too rich so turn clockwise. If if slows before it picks up to full revs turn anti clockwise.
First there is an throttle idle screw that adjust the amount of throttle at idle try turning it ccw until it idles down. If this adj is at its lowest level then adjust the L screw until you get the idle you want. Then try to rev up it should rev up without hesitation if not hold down on throttle untill you get max rpm it it tries to cut out etc. at high rpm adj. the H screw until you get max rpm. then adj your L screw again for proper idle. You may need to do this back and forth for awhile until you get max. performance.