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pwadz

Air Cooled Mono 2 stroke mix????!

12 posts in this topic

Advise needed please ,just starting out in the world of Trials with a  Fantic 303 ...

Confused about oils ...mineral or Synthetic ?  Mix ratios?

Any suggestions would be gratrfully recieved

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Posted (edited)

8 hours ago, pwadz said:

Advise needed please ,just starting out in the world of Trials with a  Fantic 303 ...

Confused about oils ...mineral or Synthetic ?  Mix ratios?

Any suggestions would be gratrfully recieved

Personally I would use fully synthetic only and at 50:1 but.....32:1,   40:1 , 50:1    any one of those will work take your pick......if you are are the worried type mix at 32:1 if not then go 50:1 or wait for some one elses post that says mix only semi synthetic at 25:1.

normally on an aircooled trials 2t you would not mix at less than 50:1...[.eg a mix of 60:1]..........IMO.

Edited by oni nou

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Manuals for air cooled bikes usually recommended 32:1 but that was in large part due to the variability in oil and fuel quality and a margin of safety built into the recommendation. If you have access to a good quality synthetic oil 50:1 will work fine. I ran Bel-Ray MC-1 for decades at 50:1 in everything from Maicos to Bultacos to Can-Ams (Armstrong) with never an oil related failure. Now having said that I assume you are riding the mighty Fantic like a trials bike and not flogging it like it was a short legged MX bike. I've seen that done and it causes "unusual" wear in a trials engine.

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The recommended ratio by Fantic back in the day on a then ordinary oil was 50 to 1 (don't know about the 303 but earlier models had the measure in the filler cap).  No need for full synthetic really as any oil nowadays should be superior to that of 35 years ago.

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I was thinking stick with mineral oil.... is castrol 2t a good one or is there a more superior mineral based to use?.

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Posted (edited)

5 hours ago, pwadz said:

I was thinking stick with mineral oil.... is castrol 2t a good one or is there a more superior mineral based to use?.

I was thinking you would say that ....if you can find some mineral 2t oil then try  32:1 its your perfect mix. If Castrol cannot make a decent oil by now after all these years in the business then who can.

Edited by oni nou
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On 20/6/2017 at 8:44 AM, pwadz said:

I was thinking stick with mineral oil.... is castrol 2t a good one or is there a more superior mineral based to use?.

40 years ago Fantic recommended run with mineral oil at 2% (50:1)

now i race the 240 and 300 at 1.2% (80:1)  with synt oil (Motul 800-710 or other brand )  without any unusual wear, i tell you this because i have demounted my engine last year and the interior of the engine was perfect, so i think it's not necessary run at high percentage

 

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46 minutes ago, alberto said:

40 years ago Fantic recommended run with mineral oil at 2% (50:1)

now i race the 240 and 300 at 1.2% (80:1)  with synt oil (Motul 800-710 or other brand )  without any unusual wear, i tell you this because i have demounted my engine last year and the interior of the engine was perfect, so i think it's not necessary run at high percentage

 

Its a great STORY but running at 80:1 in an aircooled engine in Italy where it is probably warmer than it is in the UK......just not possible...... your  engines are definitely ruined,I should have another look and rebuild them then use a bucket full of oil to a cup full of petrol.

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I think for most bikes, 50-1 is the sweet spot, with modern oils  

Edited by shakennstirred

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On 21/6/2017 at 8:28 PM, oni nou said:

Its a great STORY but running at 80:1 in an aircooled engine in Italy where it is probably warmer than it is in the UK......just not possible...... your  engines are definitely ruined,I should have another look and rebuild them then use a bucket full of oil to a cup full of petrol.

i have some trouble to translate (sorry) but i understand that you think it's not possible to run at 80:1  ?

i ride my Fantic trial from years only in classic competition and trial practice, usually 10 liters gasoline 100 octane with 140 cc of sinthetic oil but last year i cheked ours engine and discovered inside a lot of deposit on pistons and head, and watching the bearing, pistons and cylinders they were full covered of oil (like a four stroke) so i decided (after suggest of my mechanic) to reduce the oil at 80:1 (our Beta evo run at 90:1)

consider that ossa and vertigo run at 120:1 and they run well, Beta enduro 250/300 2t self mix run from 0.8% to 1.6%

this is what really happen here in Italy in my garage and see with my eyes, and yes here is very hot  ... but i never ride my bike on street and at high rpm

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3 hours ago, alberto said:

i have some trouble to translate (sorry) but i understand that you think it's not possible to run at 80:1  ?

i ride my Fantic trial from years only in classic competition and trial practice, usually 10 liters gasoline 100 octane with 140 cc of sinthetic oil but last year i cheked ours engine and discovered inside a lot of deposit on pistons and head, and watching the bearing, pistons and cylinders they were full covered of oil (like a four stroke) so i decided (after suggest of my mechanic) to reduce the oil at 80:1 (our Beta evo run at 90:1)

consider that ossa and vertigo run at 120:1 and they run well, Beta enduro 250/300 2t self mix run from 0.8% to 1.6%

this is what really happen here in Italy in my garage and see with my eyes, and yes here is very hot  ... but i never ride my bike on street and at high rpm

Alberto thankyou for your reply.......It is very good,I like it very much.

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