good luck to you, take your time with it don't rush things, it takes time to develop a sense & feel for tuning 2strokes, it's both science & art.
WTH happened? did you stick a jet a lot smaller than your previous one? also did you bleed off the cooling system of air bubbles or pockets thoroughly? the cooling system palys a big parts in keeping your cylinder from seizing.
if you holed a piston which i suspect you have a preignition problem which can only be solved by increasing your cooling capacity (2 radiators).
are you running with the stock air box on? on our Beta Ark with Evo1 LC untuned it has 50 pilot jet & 72 main jet, we don't have a smaller pilot jet here so i just turned the scew by .5 turn from close.
also the needle clip is set at the top groove (#1 leanest) so it doesn't blubber when you crank the throttle from idle.
try running more oil, 25:1 should be fine.
what are your transmission settings? sounds like the tranny is off if it takes you 40mph before it pulls strong.
How's the new engine? Done yet? Sorry about the motor bud.:'(just fryed me engine. cut dead today while doing 63 mph maybe size 80 jets to lean looks like its going to be expensive. no compresion at all. OUCH!!!!!!!!
It's running good, but still too rich. Plug blackens at 1/2 to FULL throttle.
is seems to run best with 50 idle and 80 main. i didnt know you could adjust the needle clip. if i take it apart do you think i will be able to adgust it (phbg 21mm).
my oil is 35:1
my transmition settings are: polini super speed variator (9 rolers). i got lightest waights that came with is installed. and blue clutch springs.
i want to upgrade all my transmitions but i dont know which stuff to get appart from the polini evolution 2 setup.
also my timing is about 10 mm advanced and my overheating light keeps coming on until the power kicks in at 40- 45 mph.
Thank you very much tiba !
How's the new engine? Done yet? Sorry about the motor bud.
I'm still in testing, currently at 96 main 42 idle. (I'm going to lean to a 94 today)
It's running good, but still too rich. Plug blackens at 1/2 to FULL throttle.
Here's something, The bike has always run smooth at WOT, (by smooth I mean vibration-free, clean-sounding burn, massive pull), but that's where it is still running the richest and blackening the plug. Then, at low rpm, it is just right, (i think) on which jet (42), but doesn't run as smooth as WOT IMO.
Maybe Tiba could share what he knows about this. I assume it is related to my taller gears as the bike tries to get moving.
I washed the bell and the clutch pads, and there is still a hint of vibe at low end, but it's much better, and haven't stiffened the clutch yet but will play with that next. What would happen if you loosened your clutch way down towards like 4000rpm? Is that more like a stunt-bikers setup? or, Would it lug and bog up to high rpm? Just curious as I am new to clutch settings, but do get much of the theory.
Question for ya Tiba. Will a correctly jetted carb bring a dark plug back to a chocolatey brown over time? I ask because I have a few black plugs around now and was thinking that they could be used again when the jetting is right. I know this sounds pretty newbish, but that's because I'm a Newbie. LOL
are you running with the stock air box on? on our Beta Ark with Evo1 LC untuned it has 50 pilot jet & 72 main jet, we don't have a smaller pilot jet here so i just turned the scew by .5 turn from close.
also the needle clip is set at the top groove (#1 leanest) so it doesn't blubber when you crank the throttle from idle.
try running more oil, 25:1 should be fine.
what are your transmission settings? sounds like the tranny is off if it takes you 40mph before it pulls strong.
if you run the W3 needle it might go too lean & seize the piston, even a 0,01 to 0,02mm increase in needle thickness will be a dramatic change for such a small carb. i suggest you stick with teh stock needle for now, it worked for us so i think it will work for you, you just need to tune the carb really well.
what problems are you experiencing this time with the carb & engine?
get the VForce 3 reedvalve it's better than the malossi & polini reedvalves, it's what we use on our race scooters.