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    93' Polaris SL650 engine conversion

    Good Day to all. After being tied up for some time, I am able to get back to work on our waverunner. Here's my dilemma. I have a 93' Polaris 650 (bought it new) with a completely rebuilt engine...
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    I bought this new and the carbs are original to...

    I bought this new and the carbs are original to the ski.
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    yes, I have the recessed area filled with WD40. ...

    yes, I have the recessed area filled with WD40. I may try raising the arm a little. I've been trying to come with a method of setting up some sort of tubing to the outside cover atmosphere hole to...
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    Genuine Mikuni kits vs no-nam brands

    I have made substantial progress with my 93 Sl650, but am still fighting a hesitation from idle to mid range. I have read everything and tried just about everything. I actually don't remember when...
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    Polaris early year tuning differences!

    Can anyone who is knowledgeable about the early Polaris SL650 models briefly explain why the carb settings are so different on what seems to be the same engine? After months of fighting my 93 Sl 650...
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    Thank you sdlvx! I just bought one through...

    Thank you sdlvx! I just bought one through Amazon. I also FINALLY got this running correctly after about 3 months of messing with it. I did:

    ...all 3 carbs and new kits twice
    ...all new hoses,...
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    Final tuning 93 SL650

    Can't fit my 70 year old hands to carbs with the F/A installed but tuning it without the F/A means it will be rich when F/A (stock) goes back on. Is there any kind of secret to compensate or will...
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    Thank you johnt365, for your comment. I have...

    Thank you johnt365, for your comment.

    I have taken it out several times in the last month. "sometimes", it will take of like a rabbit and rn ike new and then all of a sudden, it boggs as soon as...
  9. Sl650 temp sensor upgrade and carb tuning success - a must read

    Good day; a quick question and then a very embarrassing admission re: resolving carb tuning issue.

    On my 93' SL650 ski, can I easily add a gauged temp sensor to replace the original buzzer?
    ...
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    This is turning out to be my own little back and...

    This is turning out to be my own little back and forth. Anyway, I removed the heads a few hours after my lake ride. Now, remember that I had to turn the lows and highs out from book settings to get...
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    There are numerous threads and posts relative to...

    There are numerous threads and posts relative to the benefits of installing a restrictor in the main return line and enlarging the individual carb restrictors. Having previously lost a piston due to...
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    I'm answering my own thread because I just got...

    I'm answering my own thread because I just got back form the lake. To begin, I have three semi related threads open. This one, one on low compression (90-100 on all 3) and a thread on mixed gas. ...
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    I ran it, maybe 1 hour total. However, that...

    I ran it, maybe 1 hour total. However, that included mostly trying to get it to idle descent so I could keep it going. At the time, I was so concerned of frying another cylinder, I had it too rich....
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    I will go for the 32:1 for a few tanks. I may...

    I will go for the 32:1 for a few tanks. I may have to pull the heads off soon anyway. I rebuilt and then it sat for 4 years. Compression is low on all 3. If it doesn't improve quickly, I'll...
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    I have always read 30:1 for racing, high...

    I have always read 30:1 for racing, high performance etc and 40:1 or 50:1 for normal so I thought I'd split the difference?? I haven't filled it up yet, so I'm welcome for any comments!!!

    Mark
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    I bought my 93' Polaris SL650 new. We took it to...

    I bought my 93' Polaris SL650 new. We took it to Lake powell, primarily, every year. I took excellent care of it and inspected it often. However, from all the bouncing, or something, the PTO oil...
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    Thank You K447 - Very interesting and exactly...

    Thank You K447 - Very interesting and exactly what I was looking for. I've read all the sides on pre-mix vs injection and your explanation explains it all!!!

    Mark
    Murrieta, Ca
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    Mixed gas vs injection

    I recently read a thread on this forum suggesting that injection of oil is more effective than mixed gas, in terms of lubrication. I also read that mixed gas utilizes more oil per gallon than...
  19. I'm just going to take it out next week and see...

    I'm just going to take it out next week and see how it does. I've been working on car engines all my life, but PWC's, not so much. I currently have the intake off and the reed cages out. While...
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    Yes I am. I read some of the posts also and went...

    Yes I am. I read some of the posts also and went out and got a good one and still the same numbers!! I was hoping it was the gauge, but no such luck!
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    You are correct K447! I did a leakdown before...

    You are correct K447! I did a leakdown before the 3 year storage and all was fine. I have been soaking the pistons while awaiting the new reeds. I'm going to run it next week and see where I am. ...
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    Initially, I lost the oil feed line to my PTO at...

    Initially, I lost the oil feed line to my PTO at lake powell, while on vacation in the late 90's. It fried the PTO. Then life got in the way and it sat for a long time, covered. Then, in 2013, I...
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    That's what I am considering. I'm waiting for...

    That's what I am considering. I'm waiting for new reeds and then I'm going to put it together and go try it. After the top end re-build, I ran it one day at a local lake, but had difficulty...
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    Thanks for the comment. I should have added that...

    Thanks for the comment. I should have added that I was unsure about my "cheap" comp gauge, so I bought a new, nice one, and got the same readings!!

    Mark
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    low compression - Can't figure it out!

    Good Day.

    SL650 Polaris. Top end done completely in 2013 before storage for 4 yearsAugust, 2018, starts right up and idles good. However, compression check now shows 100 in all three Cyl....
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