I was just stating that over the last 20 years riding I’ve always used Tune ecu whether by laptop or phone to make most adjustments on my bikes( they’ve all been Triumphs). You would just enter a new fuel map and go about your business. So I have little to no experience with carb tuning.""Normally I just change all fuel and electronic changes from my phone. "
WOW, the time warp you accidentally entered has shafted you big time. If possible, find a way to go back before it's too late!!!
I have tried 3 slides with the set up you describe. Using NZ 95 gas and the 19 pilot, 260 mains. Peashooter mufflers. 1974 850. Premier carbsHas anybody tried #3 slides in a 850 carb running 4 ring needles, cut away spray tube, 106 needle jets etc i.e. were the 3 1/2 slides used just to meet emissions? and would #3 be an improvement?
Good point, I found the same and can easily imagine it causing very annoying and intermittent issues.- and very importantly polishing the rough edges of the stamped out tags on the premier carb floats. These tags can catch on the fuel needle and either flood or starve the carb. This problem has been reported by Norman White and independently identified by an engineer friend of mine.
I have just been on Andovers website and for 850's including the Mk3 they list #3 slides...
though a 3 1/2 is listed for a Mk2A
Yes. All my manuals say 3.5 standard.johnm, thanks for your reply I have always understood that 3 1/2 was the correct slide for an 850 [I am on my 4th a Mk3] I have just been on Andovers website and for 850's including the Mk3 they list #3 slides though a 3 1/2 is listed for a Mk2A im interested in your thoughts? what part of the country are you in? I'm in Christchurch.
3 . 5 yes .Yes. All my manuals say 3.5 standard.
I'm in the Wairarapa.
All I was asking was did the consensus feel, was the change to #3.5 due to emission consequents i.e. would performance increase excluding emissions be gained by going back to the #3 slide?
Johnm answered it in post 49.All I was asking was did the consensus feel, was the change to #3.5 due to emission consequents i.e. would performance increase excluding emissions be gained by going back to the #3 slide?
I understand our New Zealand 95 RON fuel is somewhat equivalent to the USA 91 anti knock scaled fuel. Our NZ 95 may or may not contain ethanol depending on the supplier.Johnm answered it in post 49.
Not so sure emissions were a concern at the time.
Interesting Q about the 3 vs 3.5 though.
Our fuel is not the same as when when our dinosauers were created.
With the all the additives, especially ethanol, whether it be 5% , 10%, 15% or whatever, it would seem the fuel is getting leaner and thus may require
some richer mods to our antiquated, carb power beasts.
johnm's works fine on his NZ 95, is it the same as our California gas? I'm reasonalby sure it isn't. Here, we have two blends, Summer and Winter.
Be interesting if others have tried it, and where.
I may at some point, right now got too many others items to deal with.