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Old 12-04-2012, 10:23 PM   #1 (permalink)
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87 Phazer Idle Help!

I have a 1987 Phazer with twin carbs on it. When I start it when its cold it doesn't want to idle on its own! The RPM just slowly go down until it dies! So I have to keep it running by giving it throttle. Then after a long enough amount of time it idles fine at 1600. But when I ride it for awhile and it gets hot the idle goes way up to like 2500. It engages at 2600. Thoughts please?! Anyone know what's going on?! I'm thinking adjust the idle screw but I'm not sure and I don't even know how...
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Old 12-05-2012, 09:24 PM   #2 (permalink)
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my experience with the fan cooled sleds is they take a considerable amount of time to warm up. not like you want to fire it up and walk away from it while its trying to idle but more like paying attention to it and applying about 1/4 throttle while its warming up, or just feathering the throttle after releasing the choke.

if its revving up to 2500 on its own once its getting to temp, its more than likely leaning out a bit. you probably need to do some carb cleaning or check for air leaks.

if your clutch is engaging at 2600, your spring is broke or sacked, or your clutch needs some attention. it shouldnt grab the belt until about 3500.
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Old 12-06-2012, 09:38 AM   #3 (permalink)
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carb cleaning and clutch work go beyond my knowledge... ive heard carbs arent too bad to do i just havent done them myself before... is it possible it would be some sort of tuning?
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Old 12-06-2012, 10:59 AM   #4 (permalink)
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For flat slide carbs.
http://www.snowmobileforum.com/engin...yle-carbs.html

For round slide carbs.
Disassembly and Cleaning of a Mikuni Round slide Carburetor
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Old 12-06-2012, 07:26 PM   #5 (permalink)
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carb cleaning and clutch work go beyond my knowledge... ive heard carbs arent too bad to do i just havent done them myself before... is it possible it would be some sort of tuning?
tuning is pretty much done with the carbs or the clutching, so you need to inspect both. unless something is major wrong with the engine like a weak crank seal or the timing is off, you need to look at the carbs first, then inspect the primary clutch.

lots of help available to walk you through the procedures.
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Old 12-06-2012, 07:28 PM   #6 (permalink)
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basic principals apply for the most part, but the phazers use a mikuni butterfly carb.

perhaps a phazer carb cleaning tutorial would be in order.
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Old 12-06-2012, 09:16 PM   #7 (permalink)
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this might be a stupid question but how do you know if its flat slide or round slide?
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Old 12-06-2012, 09:30 PM   #8 (permalink)
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refer to post #5. yours are butterfly.

to answer your question, there are three basic styles of carbs. round slide, flat slide, and butterfly. each is determined or described by the shape and/or action of the portion of the carb controlled by the throttle cable.

round slides are just that, round portions controlled by the throttle cable. flat slides are similar in action, but the shape more resembles a rectangle vs round, hence the term "flat". your carbs are considered as butterfly due to the action. basically a flat plate that could resemble a butterfly in motion.

should make sense once you see the moving parts.
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Old 12-06-2012, 09:53 PM   #9 (permalink)
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Quote:
Originally Posted by yamadad4 View Post
basic principals apply for the most part, but the phazers use a mikuni butterfly carb.

perhaps a phazer carb cleaning tutorial would be in order.
Great idea since my '93 Phazer are butterfly too...... There seems to be a lot of Phazers still out there......
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Old 12-06-2012, 11:35 PM   #10 (permalink)
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refer to post #5. yours are butterfly.

to answer your question, there are three basic styles of carbs. round slide, flat slide, and butterfly. each is determined or described by the shape and/or action of the portion of the carb controlled by the throttle cable.

round slides are just that, round portions controlled by the throttle cable. flat slides are similar in action, but the shape more resembles a rectangle vs round, hence the term "flat". your carbs are considered as butterfly due to the action. basically a flat plate that could resemble a butterfly in motion.

should make sense once you see the moving parts.
so in that case, do you think the cleaning process will be similar? or is it gonna be totally different?
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Old 12-06-2012, 11:59 PM   #11 (permalink)
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There is one somewhere for doing the Mikuni B carb, I just can't remember where I put it.
A lot of the older fan cooled cats have that carb too.
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Old 12-07-2012, 08:51 PM   #12 (permalink)
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as i mentioned, the procedure is similar. basically the same components inside, just a few particulars applying to your sled.

since those carbs were basically the same from 84-98, seems like a good idea to address them with a specific "how to".

i will work on that in my spare time.
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Old 12-07-2012, 09:48 PM   #13 (permalink)
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thanks a lot!
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