Premix or injection

[madfella]

Been a long time since I ran a 2 stroke so interested to hear  views what preference is. Premix or injection 
Also what is preferred oil nowadays. 
I'm sure oil technology has  moved a long way since the 80s.

[veg]

The answer to this question is Arrow. Followed by arrow with a healthy injection of arrow. Seriously we are lucky to have a member on here called arrow (Gary). He rebuilds all of our oil pumps very few of us run pre mix. He will rebuild and set your oil pump to run properly and if you have a problem with your motor I guarantee it won’t be the oil pump.

[reedpete]

Nothing can beat a good working pump for oil economy and convenience…
Nothing can beat premix if you don’t trust your pump or have a tuned engine that doesn’t have a calibrated pump…

For the record… my bikes all have pumps except my old proddy racer ..

As for oil…. The go to fav of this group is Exol fully synth race … 5L is typically £30

[4l04ever]

I prefer premix. Been running the Exol fully synthetic race oil for many years with no issues.

[JonW]

I always run a pump, the issues people talked about back in the day im sure were self induced with mixed bad quality oils cos we were all skint, and it was easy to blame the pump instead of our tuning...

As Veg says, Arroooooow! 110%.

[masonmart]

The introduction of autolube and similar systems was possibly the biggest positive leap seen in 2T design and operation since day one . The other great leap for, bikes including 2Ts was the massive improvements in lube oil and the final development of fully synthetic oils so the best system has to be direct lube and synthetic oil. MHO is that, outside of a race track, there isn't one benefit that premix offers over autolube. The final hurdle will be jumped when engineers can develop exceptional direct injection for the fuel system which would allow 2-strokes to achieve the revolution that was seen in 4 stroke engines and to achieve the massive benifits that the 2-stroke cycle can and should give. At the moment 2 strokes are backward technology and premix of fuel and lube oil is the dark ages.

[dusty350]

Oil pump for me, refurbed by Gary of course

[Robbieben]

A well serviced and calibrated pump refurbished by Gary(Arrow) is by far the best option as it meters the right amount of oil continually, premix is ok but it relies on the person doing the mixing to be consistently accurate to get the same result as a pump.

[lcmarky]

As said above have Arrow refurb your pump. The Yamaha system has a really wide operating window & Arrow can confirm, but it's something like from 10:1 to 40:1 (?) & Yamaha did this for a reason across the rev range.

I have a 400cc motor now and Arrow increased my pump's output to suit.

If it's a race bike on WOT most of the time and you want less weight and less mechanical resistance, then that's another thing altogether but for the road better off with a pump.

[arrow]

Many thanks Guys for your kind comments, it's always appreciated.

For the LC the operating ratio is in the range of Circa. 20:1 to 90:1 or 20:1 to 230:1 if you use the later, smaller minimum stroke setting! I'm fairly quiet at the moment. New orders taken now being completed in around 2½ months. I've been catching up for a few years now.

[lcmarky]

Jan 9, 2024 12:59:28 GMT 1 arrow said:

For the LC the operating ratio is in the range of Circa. 20:1 to 90:1 or 20:1 to 230:1 if you use the later, smaller minimum stroke setting! 

LOL - I wasn't even close and further demonstrates why you want the pump!

[peddrotzr]

I used to premix back in 80's when racing

However these days on my LC250 road bike, I have a oil pump refurbed by Arrow its perfect.

However when I first built my Big Bore TZR (2008/09), I had to Pre-mix, which was a real pain in the Butt, having oil and a measuring bottle in the seat unit then having to guess how much fuel the tank will take at the fuel station.

Thankfully a few years ago Arrow modified the oil pump to work on my TZR535 and its been fabulous, no more messing about at the fuel pump and takes all the hassle out of riding the bike on the road.

Many thanks Arrow

Best regards
Johnny C.

[veg]

Totally with you Johnny. For the OP I run tz700 barrels and 34mm carbs I didn’t want to run pre mix it’s hit and miss and a pita. Gary refurbished and set up my pump it’s perfect.

[peter1962]

Oil pump for me aswell, only after arrow done his magic on it, i might even out live it

[4l04ever]

If anyone wants to run premix, I have made some oil bottles with a marks for 40:1 up the side. Each mark equals 1 litre of fuel. So if you put in 8 litres, you just count 8 marks and you are perfect!