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Old 02-10-2004, 05:55 PM   #1
Bitbucket
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Man,

Yamaha parts are so expensive!

I'm considering replacing the YPZ Primary (4200 miles) with a comet 102EXT.
Anyone know how to set one of these up with my current configuration?

Also,

If anyone is interested in replacing the stock carburetors with 32mm Mikuni Flat Slides, let me know. I have countless hours into tuning these babies and I can honestly say it was worth the effort. Talk about throttle response.
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1990 Yamaha Phazer II LE
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AAEN Quiet Can Pipe
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38mm Mikuni Flat Slide Carbs (Wow!)
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Old 02-10-2004, 11:35 PM   #2
Voda2000
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I can't help with the clutch but could you post some information about the carbs?

Thanks
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Old 02-11-2004, 07:00 AM   #3
vx700xtc
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What is wrong with the yamaha clutch? I assume you mean a comet 108EXP? If you are going to buy a new comet I would think it cheaper to fix yamaha clutch....but I have used a 108EXP on my sleds, they are very reliable and pretty cheap to fix but I never thought they were quit as smooth as the yamaha clutch. As for tuning look in a dennis kirk cataloge, it tells you all you need to know.
www.denniskirk.com
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Old 02-11-2004, 08:17 AM   #4
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I agree, I pulled a cracked ypz off my Exciter and put a new Comet 108 on.
It ran pretty good but wasn't as smooth as the Yamaha primary. If I would have kept the sled I was going to find another ypz for it. I had to really work to tune in the comet (spring/weight combo) Of course my Exciter wasn't close to being stock (Tim Bender Terminator, Twin pipes/44mm Mikuni's) so it was really peaky.
Maybe if it had been stock the Comet would have worked better.
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Old 02-11-2004, 01:33 PM   #5
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Voda2000

Hang tight. I need to dig up my Excel Spreadsheet.

vz700xtc

There's really nothing wrong with the YPZ, except, after 4200 miles, I went to order parts at the Yamaha dealer to rebuild the clutch, and some of the parts are no longer available. For example, I use 87f weights and a Blue/White spring. You can't get either of these parts anymore. They suggested replacement parts, but that would bring me back to stock spec's. With the pipe i'm using, i'd really like to keep my shift RPM up in the power band, around 7200 RPM or so. Does anyone have an alternative configuration?

Thanks for the Head-up on Dennis Kirk. There just a few mile away. The catalog suggests a 102-C, but the only thing I'm confused about is the crank seal. From the looks of it, the back of the stock YPZ fits into a crank seal. Does anyone know if the comet 102-C supports this?

Sneaky Pete

Thanks for the feedback. I kept the YPZ that I pulled off my 1989 Exciter, but it won't work with my 1990 Phazer II. It has very low miles on it. I replaced it with a specially machined Polaris P-85 shortly after I got the sled. Anyone need one?





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1990 Yamaha Phazer II LE
Boyesen Reeds
AAEN Quiet Can Pipe
Bender Fresh Air Intake
38mm Mikuni Flat Slide Carbs (Wow!)
------------------------------------------------
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Old 02-11-2004, 03:04 PM   #6
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I am also interested in your flat slide set up. I have 2 Phazer II's in what my wife
calls Pete's Orphanage for wayward sleds. (I have a garage full of adopted sleds).
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Old 02-11-2004, 09:46 PM   #7
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Voda2000 & Sneaky Pete

Here's the info on the Mikuni TM Series 38mm Flatslides. (I previously said 32mm. There actually 38mm)

The model number of the carburetors are: T38/T4. You will need to replace the stock throttle handle with a twin cable type. (Long throw) Keep in mind that I've changed the air box, reeds, and pipe. Here's what I came up with after countless hours of tuning.

Pilot Jet: 35.0
Air Jet: 1 1/4 Turns
Slide/Cutaway: 1-1P/4.0
Needle Jet: 389 - R-O
Needle: 6FJ40
Needle Clip: 3rd Position
Main Jet: 340 / 350 PTO

Now for the caveats:

I consider this configuration as running on the ragged edge. I have perfect piston wash when running on groomed trails. I would not recommend running in deep power for any length of time without re-jetting. I use good gas at all times, and use Isopropyl when it's really cold. (Just a good idea anyway)

If your considering trying this, I would recommend jetting up the mains 1 or 2 sizes first just to be safe, then if you have the typical Gurgling on top-end, jet down from there. Start Fat, then move to lean. (Exactly opposite of our weekend dating strategy)

I've attaching a photo of my setup.

Good Luck, Have Fun.
Attached Images
File Type: jpg Mikuni_32mm_Flats.jpg (41.6 KB, 131 views)
__________________
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1990 Yamaha Phazer II LE
Boyesen Reeds
AAEN Quiet Can Pipe
Bender Fresh Air Intake
38mm Mikuni Flat Slide Carbs (Wow!)
------------------------------------------------
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Old 02-11-2004, 09:56 PM   #8
Bitbucket
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I still need recommendations on clutch weights and spring for a YPZ on a 1990 Phazer II. I'm currently using 87F with a Blue/White spring, but you can't get them anymore and I need to replace them. If someone could post what weights/spring your using with a tuned pipe, it would really help. I'd like to stay around 7200 RPM shift.

Thanks

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Boyesen Reeds
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Bender Fresh Air Intake
38mm Mikuni Flat Slide Carbs (Wow!)
------------------------------------------------
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Old 02-11-2004, 10:04 PM   #9
vx700xtc
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Dennis Kirk uses comets tuning and application chart ... so(this advise maybe worth exactly what you paid for it) if it lists your sled in the chart it should work, you can call comet directly. I dont have the number at home but if you can not find it I think I have it at the shop. They are located in Richmond Indiana. I have talked with them in the past and they are always very helpful. Someone there can probably suggest the proper cams and spring for your desired shift point. As for not being as smooth...I dought you will notice since your sled is not stock and you probably wont be offended by a little less subtle ingagement, you might even like it better. I had a 102C on a 1980 SS440 and was perfectly happy with it. I put about 5000 miles on that clutch with no problem. Hope that helps. I am very dissapointed that yamaha is dropping some parts for a sled not all that old and loved by those who have them.
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Old 02-11-2004, 10:07 PM   #10
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i dont mean to divert the topic, but.....what RPMs do you max out at on your phazer??
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