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post #21 of 30 (permalink) Old 01-22-2013, 04:40 PM
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Re: 86 yamaha phazer help

Use a piece of stripped house wiring (solid copper) about a foot long. Leave an inch at the end and bend a 90 angle. Open choke and stick one inch part under choke plunger. Close choke, it should grab the wire. If so go on to the other carb. Just incase you wanted to check them
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post #22 of 30 (permalink) Old 01-22-2013, 07:36 PM
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flat is the norm. making sure the circuit is both clear and free depending on flipper position is the key.

you need to think of the choke lever as allowing more fuel into the low speed circuit. if its not not sealing properly, its allowing extra fuel.
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post #23 of 30 (permalink) Old 01-28-2013, 10:10 PM
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Yeah, it sounds like one side is not getting all the way up onto the main jet. I would check what jets are in it and maybe go up a size or two and see if that helps. I could be jetted for a much higher elevation. Are you getting any popping or farting when you are full throttle for a ways? Another thing to do is check the float levels on both carbs.
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post #24 of 30 (permalink) Old 02-04-2013, 01:19 AM
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If no one has mentioned it already, check your coil. It can cause the symptom you describe.

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post #25 of 30 (permalink) Old 02-07-2013, 10:51 AM Thread Starter
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Thanks guys, I was gone on holidays for a while so I turned my brain off of it for a while. If it was the coil, I would think that turning on the choke wouldn't do anything, am I right with that thought? I swapped the choke plungers for the ones from the parts machine, they are the ones with the points on the bottom, the sled runs like crap with them in, can't even get up to speed.
Something I am very confused with, and may have trouble explaining is...
If the choke allows more fuel in, and it is not sealing properly, why would turning the choke all the way one allow the machine to run better at full throttle? It will burp and fart if I let off the throttle and try to go at a lower rpm. Sorry, I think I may be getting to that stage where I've thought about this stinkin thing so much that nothing is making sense in my head anymore
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post #26 of 30 (permalink) Old 02-07-2013, 10:56 AM
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Quote:
Originally Posted by Squint View Post
If it was the coil, I would think that turning on the choke wouldn't do anything, am I right with that thought?
Ya, I didn't see that.

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post #27 of 30 (permalink) Old 02-07-2013, 11:07 AM
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If the engine is a little lean at higher rpm, you will get that popping and farting.
Flipping the choke on richens it up and clears it.
Next time you have a chance, run it up till it starts doing that and without releasing the throttle, hit the kill switch. Pull the plugs and check the tip color.

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post #28 of 30 (permalink) Old 02-07-2013, 12:32 PM Thread Starter
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It runs smooth at 5000, no popping and fartin, turn on the choke, away it goes off to 7000 rpm, let off the throttle and it pops and farts as the rpms get lower. Held it wide open, choke off at 5000rpm, killed the motor without letting off throttle, plugs looked good, that nice chocolate color. I held it at full throttle for roughly a 1/4 mile, maybe I should hold it there longer? Am I not giving it long enough to show the symptoms on the plugs?
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post #29 of 30 (permalink) Old 02-07-2013, 01:39 PM
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Check the compression on both cylinders. I know with a boat motor you can have similar symptoms when the compression gets too far off between cylinders. Otherwise, no matter what your plugs are saying the symptoms are showing a lean issue. Have you made sure that both sides have the mixture screws set about the same? I would hate to see you melt the thing down trying to get it to rev against its will when it is lean. Sooner or later there is the increasing chance to melt a piston. If all else fails, you are only out a few bucks by putting 2 size larger main jets in it, if that helps you know you are on the right track.
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post #30 of 30 (permalink) Old 02-23-2013, 08:30 AM
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I had a 86 Phazer wouldnt rev past 5500. I had my carbs sonic cleaned, checked for air leaks, check clutches, exhaust, new impulse line / fuel lines / pick up in tank, compression, etc. No change.
Here is a list of the other things I did and now it works well. Voltage regulator under left foot, the wire was completely corroded. ( Im pretty sure this was the real problem) Fixed that. Cleaned stator, thoroughly. Ran extra ground from block of motor to frame. New reed gaskets (old ones looked iffy even though I couldnt find a leak). Replaced all the old bullet connectors (some were hiding corrosion). Broken Stud on exhaust head.
Hope you find the problem. Good luck.
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