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Old 11-23-2004, 11:54 AM   #1
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I just bought a 1980 Pantera with oil injection. Would it be smart to remove the oil injection system and run as a pre-mix sled? Any downside to removing? If I leave the injection system on should I run premix gas in the sled at a lower ratio say 75:1 as a safety measure in case of injector failure?

Interested to hear thoughts on this.
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Old 11-23-2004, 07:28 PM   #2
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It might not be a bad idea, just to be safe. As long as you don't mind mixing. I think I probably would go with the pre-mix on an older sled like that.
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Old 11-24-2004, 09:06 AM   #3
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 Quote:
Originally posted by thads03@Nov 23 2004, 12:49 PM
I just bought a 1980 Pantera with oil injection.* Would it be smart to remove the oil injection system and run as a pre-mix sled?* Any downside to removing?* If I leave the injection system on should I run* premix gas in the sled at a lower ratio say 75:1* as a safety measure in case of injector failure?

Interested to hear thoughts on this.
= Leave the oil injection system on! In my 30 + yrs in this sport I have never witnessed a failure on this system. Not to say it couldn't happen but with good maintainance these oil injection systems are very, very reliable....even on 1980 model sleds!



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Old 11-24-2004, 01:03 PM   #4
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I have two 1980 panthers with the oil injection. I like it, but I wonder what the fuel/oil ratio is set to mix at. If it is 20:1, would I reduce the chance of plugs fouling if I pre-mixed at 50:1? I am switching to syntheic oil becuse I heard that helps.

I don't have an exceptionally bad fouling problem, but occassionally I do have to pull over the sleds a bit to get started and sometimes fouls.
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Old 11-25-2004, 07:49 AM   #5
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I don't know how the A/C oil injection is set up but would assume it is simular to the Yamaha's. I had asked an Yamaha dealer the same question back in the early-mid seventies, he said that the oil injection was set to mix at 120:1 at idle an 17:1 at WOT. The reason being that the motor needed more oil at full throttle and less at idle which seemed to make sense to me and this would greatly decrease the fouling of plugs and add to the motor's life. The Yamha's oil injection was and still is adjustable and I would assume the A/C's is too. My vintage Cats don't have the oil injection as they are older sleds so I'm just not sure what the adjustments would be......... how's the spark and carb adjustments?
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Old 11-25-2004, 10:16 AM   #6
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Too bad Yamaha mixes the oil and gas before the fuel pump. So when you at WOT you still have the 100:1 ratio for a while before the oil pump catches up with you. My 87' Exciter has the variable oil pump. Bender has a solution for it though. I would still use the oil pump on your Pantera. My buddy has an 80' Panther and he has no problem.
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Old 11-28-2004, 03:40 PM   #7
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If you aren't having any problems with the oil injection system, why remove it? One of the best things about having the oil injection is that you can pull up to any gas station and just fill up your tank. With premix you can't do that very easily.

I have worked on quite a few 2 stroke motors in bikes and sleds, and haven't seen an oil pump fail yet. I'm sure it can happen, but I don't think it is very likely.
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Old 11-28-2004, 06:37 PM   #8
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I had a pump fail on a Yamaha I had, but never on a Cat. I had a '79 Jag 3000FC with God knows how many thousands of miles on it and never had a problem with the oil injection. I bought the sled in 1983 and rode it every single winter up until about 2 years ago when I finally sold it, and it still ran perfect.
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Old 12-04-2004, 06:22 AM   #9
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Leave it on, I have worked on Cats for many years and failure on that system is rare.

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