1991 Yamaha Phazer II Tuning - Snowmobile Forum: Your #1 Snowmobile Forum
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post #1 of 14 (permalink) Old 01-29-2009, 11:38 PM Thread Starter
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Cool 1991 Yamaha Phazer II Tuning

Hi Everyone!!

Im new here to the forums cause im looking at getting some info on tuning my 1991 Yamaha Phazer II.

I used to ride it when I was a lot younger and then my brother was using it for a while after that. It was parked about 4 years back and nothing was really done for storage. It sat outside for the entire time.

I took it home with me and cleaned up the sled in general. took off the carbs and cleaned the jets. put in new fuel/oil lines. New battery (electric start). Drained the fuel tank and added new fuel. replaced a few other misc parts.

Yesterday I fired her up and it runs, but just not great, its quite boggy in the lower end before the clutch engages. Almost sounds like its running on just 1 cyl. Once you open it up a little bit it seems to run much better, but not 100%.

What I am wondering is where to start with the tuning for the carb/idle/throttle/oil pump controls. Anyone have any good hints and tips on how to get my baby back up and running. its a great sled and it just needed a little bit of TLC and I cant wait to start riding it again.



THANKS IN ADVANCE!!
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post #2 of 14 (permalink) Old 01-30-2009, 06:37 PM Thread Starter
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I took it out again today to try and play with it a little bit during daylight, but no luck. I dont know what the settings for the oilpump/throttle cables need to be at, and I forgot to measure before I took it off. It always was slightly boggy in the lower end.

Where do I start with the cabling? I heard that the oil pump cable should have 23mm of slack. Where do I measure that?

Im really in need of some tips if anyone could share that would be greatly appreciated.

Thanks

Last edited by Benwahballz; 01-30-2009 at 06:48 PM.
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post #3 of 14 (permalink) Old 01-31-2009, 06:20 AM
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I would go back into the carbs and pay attention to the pilot jets and circuit! Also the chokes too! Remove the air screw and clear that, and set it at 1 1/2 out! Fresh plugs and trim a 1/4" off the wires too!
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post #4 of 14 (permalink) Old 01-31-2009, 11:07 AM Thread Starter
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I would go back into the carbs and pay attention to the pilot jets and circuit! Also the chokes too! Remove the air screw and clear that, and set it at 1 1/2 out! Fresh plugs and trim a 1/4" off the wires too!
Rather than tearing out the carbs again im gonna start with easier things. Ill start with removing the air screw and cleaning that and setting them to 1 1/2 turns out. Im going out shortly here and im gonna pickup some plugs as well as cutting off the 1/4" off the wires too. See what that does for me. if that still doesnt seem to fix it then im gonna probably pull the carbs off again and give them a better cleaning. Double check to make sure there is no gunk buildup.

Thanks for response!
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post #5 of 14 (permalink) Old 01-31-2009, 02:47 PM Thread Starter
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More info: I went out and got some new plugs. Trimmed up the plug wires 1/4". Reset the air screw to 1 1/2 turns out. It seems to idle a LOT better than it did before, but there is still very poor power between 2500-4000rpm. Any suggestions on what to check next? I still need to get a new belt and slap that in too. The weights on the clutch might be worth looking at as well
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post #6 of 14 (permalink) Old 02-08-2012, 02:24 PM
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Originally Posted by Benwahballz View Post
More info: I went out and got some new plugs. Trimmed up the plug wires 1/4". Reset the air screw to 1 1/2 turns out. It seems to idle a LOT better than it did before, but there is still very poor power between 2500-4000rpm. Any suggestions on what to check next? I still need to get a new belt and slap that in too. The weights on the clutch might be worth looking at as well
I am in the same boat with my 1991 Phazer II.

I'm a super noobie when it comes to sleds. I cleaned the carbs, new belt and adjusted the air screws to 1.5 turns out. The sled runs great other than the low end when it seems to bog until I can work the rpms up. I've adjusted the idle control to a higher setting but then the sled just wont sit still and still bogs when throttle is applied. I'd love to narrow this down so I can feel confident to take my little fella on some back trails. Any help is greatly appreciated.
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post #7 of 14 (permalink) Old 02-08-2012, 08:21 PM
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Did you remove the pilot jets up in the tubed?
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post #8 of 14 (permalink) Old 02-10-2012, 10:14 AM
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Did you remove the pilot jets up in the tubed?
I'm not exactly sure what you mean by "in the tubed" but I did disassemble the whole carb and cleaned everything with toothbrush and brake cleaner then reassembled.

I did notice a small amount of exhaust coming from front side carb boot after shut off. I tighted up the collar/clamp but I havent had it out since.
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post #9 of 14 (permalink) Old 02-10-2012, 12:03 PM
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spray some starter fluid behind the clutch while running to see if the seal is leaking. i have a phazer that was acting just like yours- idled good had a bog and was ridable above the bog.
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post #10 of 14 (permalink) Old 02-11-2012, 07:20 AM
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spray some starter fluid behind the clutch while running to see if the seal is leaking. i have a phazer that was acting just like yours- idled good had a bog and was ridable above the bog.

Thanks for the advise zobenv. I just want to remind you Im a complete noob but willing and able

Ive done a few searches about this procedure but Im not entirely confident just yet. Care to expand on the issue? How did you remedy and were you able to keep riding it?
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post #11 of 14 (permalink) Old 02-11-2012, 07:48 AM
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If when you spray that area, the engine rpms go up, then the seal is in need of replacing because of an air leak.
If you do not replace it and keep running like that you will end up replacing the piston too.

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post #12 of 14 (permalink) Old 02-12-2012, 07:51 AM
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The pilot jet is the smallest orfice, from the bottom of the carb there is a small tube and the jet is up inside! Use a good standard straight screw driver and grind it down to the size of the tube (about 3/16")
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post #13 of 14 (permalink) Old 02-14-2012, 07:17 AM
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1 more thing that happened to me was- after cleaning carbs the thing sounds like its running on 1 cyl, found the fuel line under the air box was kinked (1 carb getting required fuel) so i always check this, it is hard to see
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post #14 of 14 (permalink) Old 01-20-2013, 09:55 AM
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oops wrong thread

Last edited by Lefty506; 01-20-2013 at 10:06 AM.
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