does anyone recall the gas oil ratio of mid 70s bultaco dirtbikes?
my friend in the boonies has one he says i can have but he doesnt remember the ratio.
thanks pat in milwaukee
It might be a 10:1 ratio, but it's safer to add alittle bit more oil. If you put too much oil, then it'll just smoke abit. Not enough oil, and you could have problems.
1:10 sounds as a very high oil rate to me.
For 2 stroke garden machinery and chain saws you use 1:40 up to 1:20 in rare ocasions. My sisters Hercules to that time went with 1:30.
I feel like in my back part of the brain that in deed for the motocross bikes in that time you elevated oil ratio quite a bit. (I tried one that had no force below 9000 rev and was a hell to maintain on the floor even in forth gear up to 14.800rev) The guy allways made weared mixtures of oil including weapon oil Balistol and that he prepared in canisters at a ratio about 1:30 to 1:25 if I remember right. His bike was a Maiko as the Brits used for motorbikefootball.
With the MZ we used to say that the engine will not be free until the piston bound up the first time.
Start with a high oil rate going smooth and play a few tank loads until you feel confortable.
I'd start with 1:20 and why not if you want to clean out the carbon put a little Balistol on top. Works great that stuff. But in some ocasions it would make loose the compression maintained by the carbon.
Spanish Bultaco are great montain goats and worth to whipe off the dust and put them back where they belong - on the track!
Regards
Sven Peter
one quart of 2 stroke bean oil to 5 gallons of gas.
thanks everyone
pat
I used a quart to 5 gallons in my Bultaco Alpina 250 of 1973 vintage. That is a little strong if you idle around a lot. It has to be as strong a mixture as you'll need for all out performance and so will smoke a bit at idle but that's ok.
Ralph
i didnt take it. it was a 66 campiera yhat looked like something the wright brothers beat the hell out of and threw away
pat
