Premix Oil

[richt]

The only bike I've run at 20:1 was my FS1E  ? wish I still had it.

[Ryder40BC]

Just out of interest for you on 2t premix worrying ....the Vertigo trials bike manual says 133:1 pre mix ratio and the UK importer recommends 25ml per 5 litres of fuel [200:1]  and owners have said that at 200:1 over a years use they had no problems .....the Vertigo cylinder and piston have no special features they are like the GasGas pro .    TRS bikes run on 100:1 mix without any problems  the OSSA TRi used to run at 120:1........I used to run a 125 Gas Gas pro 2004 model at 100:1 with no problems at all ...no different than when I ran one at 50:1 ........obviously if you were going to ride it on the road at speed for a while you would be wise to add more oil ......people were running the old 1998  GasGas motor at 100:1 without problems back when they were new and that motor had the crank bearings lubricated by the pre mix unlike the gearbox oil lubed  crank bearings in the pro bikes.

I am not suggesting you should stop putting in a bucket of oil but  just pointing out that modern 2t oil can lubricate perfectly well at very low mix ratios without the motor seizing under normal 4 lap 10 section short courses.

if your GasGas Is not starting easy HOT or Cold then try full choke and NO throttle  and  press pedal down lightly until you feel resistance then kick HARD and FAST cracking the kick pedal against the footrest [that is designed to be the kick pedal STOP.]

Thanks oni nou for the starting tip.  I took your advice and a few tips from others such as rocking back and forth in 2nd several times and it seems to be lighting up a little better when cold. Seems the trick is keeping the kick velocity up rather than using brute strength to kick it through. Kicking it slightly rearward than downward like a mule seems to work better and both feet up even easier ...

I can see the full on kick from the top without engaging the gear some recommend online and in videos working well but the initial shock causing issues and busted parts pretty quickly.

As for the ratio with Motul 710 when cold it does a great job at killing mosquitoes at 67:1 and clears up when it reaches operating temperature.

 

 

 

 

 

[Ryder40BC]

I have been running Motul 710 2t for over 10 years at 80:1 in my current 09 Evo 290. Always starts first or second kick and never any smoke and have never fouled a plug. I also ran it in 2 previous Rev. 270's with no issues. I do run half pump premium and either VP 110 or C12. I also use it in all of my 2 stroke power equipment at 50:1 on pump premium with no plug or clogged exhaust issues.  Love this stuff, I bet I have burned 5 gallons of it over the years. Plus the fact that the green oil with green C12 looks really kool,  I have been told the difference between the 710 and the more expensive 800 is that the 800 has a downstream detergent package to keep power valves, which we don't have in trial bikes cleaner.

 

I had a importer for GAS GAS tell me the same thing, they ran the Pro's at 80:1 no issues. I seem to like the Motul better than another oil a lot of guys are running. Smells a heck of a lot better anyhow and has a good history from what I'm reading... I've heard a few gassers that had run 80:1 from new and some sound great, others have a little top end rattle which could be arguably from lean oil mixing, poor warm-up, possibly cold seizures, out of round pistons...who knows? Hoped to not start a debate on mix ratios, just what has been working great with no issues and possibly a few jetting tips.

Thanks!

[Elnonio]

Interesting read. My txt300 2020 had a sticker that says to premix 2%, the manual says 1:67 (which is what, 1.5%)

Far cry from my KDX that call for 1:32!

[anotherfive]

I use Castrol A747  at 100 to 1. 50ml in 5 ltres of fuel in the Gas Gas. Been doing this for 5 years and no top end issues. It also smells fantastic

[Elnonio]

I for one prefer the relative safety of non castor oils. No worries about deposits, settling, shaking the can or bike.

Just pour and go