1971 303 Wankel fuel mixture - ArcticChat.com - Arctic Cat Forum

 
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post #1 of 7 Old 01-11-2009, 10:23 AM Thread Starter
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Sled: 1971 303 Wankel
I have just purchased a 1971 Panther 303 wankel with the RC 1-18.5 motor and I need to know the correct fuel mixture. I would also like help locating a manual for the sled.

Thanks
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post #2 of 7 Old 01-11-2009, 04:50 PM
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Sled: 68 Panther,70 Puma 744, 91 EXT 530.
07-08 Mileage: 500
ATV: 88 quadrunner 250 lt
With todays oil being 100% better that oils from the 70's. I ran arctic "50:1" oil mixed 40:1 (16oz oil to 5 gal gas) in my 72 303 wankel panther. Back in the day, it was 20:1. You where to mix 5 gal gas to 1 qt 30wt motor oil. If you feel uncomfiortable running 40:1 try something in between. I had no problem with a 40:1 mix and I run that in all my vintage sleds. From my 68 P-17-H Panther to my 79 340 Panther. Bottom line is todays oil are much better and running excessive oil is a waste, also makes the engine hard to tune, (rich).

I will give up my vintage sled when they pry my frozen dead thumb from the throttle......WOT of course!
68 P-17-H
70 Puma MOD 740 Sachs
71 292 Lynx
72 440 Panther
78 Tiger 5000
91 EXT 530
1966 Cub 102C
1968 cub 104C
88 Quadrunner 250 LT
83 Suzuki GS 650 GL
89 Plymouth Horizon
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post #3 of 7 Old 01-11-2009, 08:22 PM Thread Starter
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Sled: 1971 303 Wankel
Thanks for the info!! I am new to the sachs wankel motor and I am having trouble starting and keeping it at idle after running. It runs great at mid to high rev but will not run at low engine speed. I am getting a carb rebuild kit for the Tillotson HL289A. Can anyone tell me where the jet screws should be set to start fine tuning?

If anyone has another theory on why it is running poorly please let me know.

Thanks for any help.
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post #4 of 7 Old 01-11-2009, 08:35 PM
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Basic rule of thumb is 1 turn out on both screws from a slightly bottomed out position.

Bottomed out meaning tighten the screw until it stops, go about this gently!!!!, until it stops, then loosen 1 full turn. That should be a good starting point. TO get it to idle, warm up the motor then mess with the low speed screw usually located on the right of the carburetor.

You may have to mess with the idle speed screw as well, which holds the throttle plate at varying degrees of openess.

Nice to see a fellow Northern New Yorker on here! Welcome welcome!!!!
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post #5 of 7 Old 01-11-2009, 09:03 PM
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Sled: 68 Panther,70 Puma 744, 91 EXT 530.
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pull the intake elbow off and fill it with gas, check for pin holes. this was a problem on them wanksters. Heres more info. Have fun.
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I will give up my vintage sled when they pry my frozen dead thumb from the throttle......WOT of course!
68 P-17-H
70 Puma MOD 740 Sachs
71 292 Lynx
72 440 Panther
78 Tiger 5000
91 EXT 530
1966 Cub 102C
1968 cub 104C
88 Quadrunner 250 LT
83 Suzuki GS 650 GL
89 Plymouth Horizon
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post #6 of 7 Old 01-17-2009, 09:01 AM Thread Starter
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Sled: 1971 303 Wankel
Thanks for the advice guys. I put the new diaphrams in the carbeurator last night. That seems to have fixed the problem. It is starting and running like a champ now.
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post #7 of 7 Old 01-23-2009, 06:02 PM
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Sled: 1972 303 Panther
ATV: Pontiac VAN
2007 Mileage: 20,000
I run 40-1 Klotz in mine but almost any good brand of oil will work in these now. Not like the old days when you had to shake the sleds to keep the gas mixed!
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