Honing Phazer cylinders

[eclipse46]

I have various size Phazer cylinders I would like to hone. Stock, .010 over and.020 over. Can I buy 1 flex hone to do the job or what do you guys recommend?? I'm new to this but it's becoming a really fun hobby. Live in the mountains, retired and Phazers are perfect for up here.

Thanks

 

[SX700triple]

Sure. .020 is a very tiny amount over the stock bore. About the thickness of a credit card. The proper size flex hone for the stock bore will happily hone oversize jugs. Welcome to the site by the way, these older Yamaha's are a blast. Have fun with the addiction

 

[eclipse46]

Thanks for the reply. I have 5 Phasers. 3 runners: 84 LT Camo 133, 89 Deluxe 121, and stock 93 ST. Parts units 89 w/ comet primary and Polaris Secondary, PSI pipe, reeds from a YZ250 , torque arm, cold air kit. 90 PII Aaen QC pipe, AM reeds w/ no reed stoppers (like the 89) and cold air kit. The 89 has 2 pistons that have chips out on top but otherwise is is great shape. The 90's motor was rusted and wouldn't move. I freed it up and the cyliners and pistons seem fine need a little cleaning. Bottom end is pretty rusty.
I want to use the reeds and 2 pipes (PSI on the 84 and AAen on the 93) but am concerned about the midrange lean problem. We live at 4600' and get snowed in so we ride snowmobiles a lot. I think midrange gets used frequently. I have been reading on the site about it. Found PSI says drill out the 3rd hole under the Welch plug and all is well. Some say new primary nozzle 80L-1499something and 2A main nozzles or 1A nozzle main. I have a pair of 2A mains in one set of carbs. Have heard of driiling the primary as well but no real directions. What's your solution?? You seem to be doing a more advanced version of what I'm up to and have good experience. What do you recommend?? I like the Welch plug solution if it works- simple and cheap (I'm retired so it makes a difference).
Also what octane should I run?? Manual says 87 for stock. Aaen says 93 w/ their pipe.
I'm thinking maybe 87 w/ ethanol , Marine Stabil, and Klotz octane boost. Or should I jst use 93 w/ ethanol and forget it. Dif gas in stock and piped sleds?? Like I said, newish to this (did a fair amount back in the late 80's) but really having fun now. Esp w/ all the neat parts I got on the parts units.

Thanks again, you're a great help. Where can I see a better pic of your sled?

 

[SX700triple]

Sounds like you have some pretty well set up Phazers!

As far as the mid throttle lean condition goes, I dont have a solid answer for you but I would personally try to find those recomended nozzles. Drilling anything in a carb makes me leary as its hard to duplicate the work from one carb to the other without accurate machine tools. Maybe call Aaen and PSI to see what they recommend. I know Aaen is very easy to get in contact with and extremely knowledgable. Both companies have active websites so there should be customer service from both.

As far as fuel goes, I always run the highest grade non-ethanol premium fuel I can find even in bone stock sleds. Necessary? Maybe not, but 2 stroke engines are high performance so why not run high quality fuel for a couple bucks more? 87 octane probably wont play nice in a motor with pipes and reeds (much higher risk of burn down, detonation, etc). If premium is not available then I would run the 87 with the stabil and Klotz out of necessity.

My '88 XLV can be seen Here - Click me

And my current project, an '83 SS 440 Can be seen Here - Click me

 

[northern srx]

Through the winter months I'll be working on a phazer motor project myself... there is a mid-range fuel delivery problem with the stock carbs and it's been suggested to use flatslide carbs from the 500 cc - 600 cc series motors to allow you to tune the mid-range more precisely by adjusting the needle clip position. Seeing that your dealing with modified motors already maybe you want to look into this?

 

[eclipse46]

lean spot is my major concern

I have a PSI single pipe and an Aaen QC pipe ready to install but I'm very concerned about reliability once I install due to the lean spot. I've heard about PSI's pull the welch plug and drill ---, replace primary nozzles with 80L-14489-00-00, drill the stock primaries all the wall thru, set the floats to 11mm, maybe more. Don't want to make a mistake here, but money is an object. If the PSI method works I'm good for $3.99 (drill bit cost) otherwise I'm out maybe $50 each sled for the new primaries. Still less than a top end rebuld though.

Anyone???

 

[PZ 1]

Yamaha sold a kit to update the carbs for the lean midrange problem. I cannot give you a part number, doing some searching here should give you more information.
I never went with the kit because I did not want to lose any fuel economy.

 

[mrviper700]

This is the single biggest problem with a phazer, the butterfly carbs!

Youll need to add a larger pilot jet and then drill out the carb orfice to get more fuel into the midrange, thats the biggest single problem with modding a phazer, it WILL burn down in the midrange.
I used to have about half a 5 gallon bucket full of pistons from a phazer mod sled , and it wasnt until I replaced the carbs with a set of exciter carbs did the piston eating stop, once the slide carbs were put on end of problem, because you can adjust the needle for the midrange where as the butterfly there is NO adjustment, so you must band aid it with giant pilot jets and drilled orfices and bigger mains.

I had 110 pilots in mine and big mains and it still would chew up the pistons first time someone ran the sled down the r/r/ tracks, where they hold the throttle about 45-50mph right in the midrange, burn the front crown right back to expose the ring....poof low compression.

slide carbs..................... Just FYI!