We think compression is good, jetting might be a little off still. Refuses to move and bogs at low rpms. Are the reeds too stiff?
Ported a35 jug, treats za50 cdi, 15.15 sha, tecno estoril pipe. Stock piston with reed transfer windows cut into it. Treats generic reed plate. Have some boyesen dual stage reeds I'm going to throw on tonight.
Ported into a boat anchor, timing wrong, jetted wrong..one of those for sure.
What's your jet at? Piston in upside down?
Pistons good, tried a 68, 64 and 62 jet. Plug looks ok. Should be timed good. Definitely feels like the reeds aren't working in the low revs. Should be ported well, rumor has it Devin Biek ported it.
drop the jetting down to a 58-60 ...check your reeds
Piston in upside down?
Oh, also, moves real good at higher rpms. Got it to 35 in a short stretch, still had headroom.
Get a port map of the jug... that'll tell ya if it's an anchor or not. I've done a bunch of port work to my a35 and don't have too great of a low end but the mid and top end is sweet, totally makes up for it.
too many "shoulds" get some tools and do it right.
restricted airflow into the carb and it started running well. hit 37, had great low end, just a little stutter at the bottom of the rev range. however, i blew a gasket or fucked up my reeds or fouled a plug after leaving the shop last night, so i've got a little work to do.
so, if it runs with restricted airflow, doesn't that mean i should be able to open it up and jet it a little better and possibly get it to perform a tiny bit better? could this be a symptom of a dirty carb? it's still pretty new, and it was running with a different setup just fine before i did the top end swap.
Upjet.
upjet? you suuuuure about that?
Hey hey..so you are jetted wrong..go figure..........
hey, man. be nice. i spent two nights in the shop trying jets from 62 to 68. have a 62 in right now. and it needs to go up? it was acting the same with the 68, would only take off if you shove your finger into the carb and block it off a bit.
either upjet or u have an air leak...obvious if u cut off airflow and it runs better
alright. i'll take a look at it. i was thinking it might have something to do with the reeds. neither Andy Howse nor i have experience with reed bikes, and we had just done a fairly intense top end swap. i'll check for leaks and upjet.
Is this a stock A35 jug on a stock A3 bottom end? Did you get the wrist pin difference worked out somehow or is yours one of the rad A3 with the 12mm pin?
nope, it's a stock a3 piston, with the windows cut. stock a35 jug, stock a3 bottom.
Upjet dummy
Joshua Walters Wrote:
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> nope, it's a stock a3 piston, with the windows
> cut. stock a35 jug, stock a3 bottom.
Did you cut the skirt to match the a35 piston? I cant remember what it was BUT you had to do more that just cut windows in a a3 piston to get it to work in a a35 cylinder. I was going to do that also but if you compair a a3 piston to a a35 iston you will see what im talking about.
i dunno, man. i just compared them, and they're identical except for the windows and the inner diameter. and i had it in there, and it worked fine.
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