• 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

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250-500cc lectron question for 300 owners?

shawbagga

shawbagga

Husqvarna
Pro Class
finally got to ride my 300 for the first time in around 18 months(been 165'n it TBH & had a few parts to order/things to fix on the big girl!) last weekend. ran awesome on top but was mega rich down low. fouled a plug too after letting it idle to warm up in the morning! fuel consumption was real high although we were on a small mx track for a fair chunk of time so lots of WOT on the straights.

i set the rod on new 38mm lectron at 49.5mm from memory which is the same as my 165 to be on the safe side as it had a fresh piston in it(first ride on it). it was the rod Kelly had worked on for the 250/300 but name escapes me now, maybe 3-2M or something(chime in here Kelly)?

Question is will a full turn out, which equates to around 1mm i believe so say 50.5mm, be ok or getting into lean territory? still 25-30C temp wise & max 500m elevation(does this matter much haha). dont have anywhere to test it before actually going riding(can start it but not ride it around my area really-suburbia) so wanna be in the ballpark plus its a PIA to take tank off, adjust carb etc when id rather be riding. just dont wanna be too lean, rather be a bit rich then can adjust it quarter turn next ride if required(when i may have more time to adjust it at riding areas). thanks
 
I'm in the process of fine tuning Lectron on a 300. I've been posting here: http://www.cafehusky.com/threads/lectron-carb-tuning-guide.32064/
I didn't measure the rod as delivered :banghead: I like to be on the rich side too, so was going richer until it blubbers. I actually thought I was still lean, so last ride went 1/2 turn in to @ 50mm, but that's too rich. Now I went a full turn out to 52mm to see how it starts and likes that. For me 1/2 turn = @ 1mm.
I've got my PJ 1/2 turn rich from stock, @ 1 turn out, for now too.
From what I've seen and heard Lectron/Kevin say it's all trial and error, every bike/carb combo is liable to be different, don't get stuck on measurements and how many turns out the idle screw is. Get it to start and idle and go from there. Once it starts and warms up, if it blubbers when rev'd it's probably too rich, if it revs quickly and doesn't return to idle smoothly then it's probably lean. My bottom half is really close, thought I still had a lean stutter, but now think it was a rich blubber :confused: We'll see, 'cause I'm getting ready to start the beast.
Once you get starting and bottom half sorted, then tune the PJ for the top end you like. I noticed as I went richer on the PJ 1/4 turn at a time my top end became more smooth and usable.
I don't think @ 50mm will be too lean, even with a new piston, but you should know right away. If it starts hard cold and needs the idle screw rich/in then it's too lean.

good luck
 
if its starting well and running ok, i would not go more than 1/4 turns. 1 whole turn is alot. the powerjet is even more sensitive. it seems the lectron is so sensitive(in a good way) that its true they are all a tad different from bike to bike i think. mines a bit different as im running a 360 but i have the 3-2 rod currently and am about 1-1/2 turns on the rod rich from where it was sent from kevin.
ithink you are right steve, lean is usually a surge or bog, especially when on the lower end
 
starts first kick no worries. idle was ok didnt have to play much with it from memory. plug was very wet/oily/carboned up after it fouled plus used a tank in like 60km(down to reserve at least) of single track & mx track. was very blubbery down low which made logs etc a bit hard to ride confidently. PJ set at half turn out from fully in. not keen to go any leaner than that plus it was sweet on the pipe pulling like a freight train. will do a plug chop for top end next ride. i have my 165 at same PJ setting so potentially i guess the 300 could go slighly leaner(1/8-1/4 turn further in).
i actually forgot how much power it has & the extra weight over the 165-overshot several corners & blew through a fair few berms too! gotta relearn to ride the big bore after being on the agile, light, WFO 165 for so long! was good fun on the big long hills:eek:. really needs a 6 speed but cant justify the spend. maybe when it has a full bottom end ill look around for one
 
I adjusted mine and rode it hard for @ 2hrs yesterday. I went from @ 50mm rod length to @ 52mm and from 1 1/2 out on the PJ to 1 1/4.
Seems like a drastic change, but only minor improvement. I still have pretty serious rough area @ mid mid-range, I thought it was lean, but now think I'm still too rich. Plug insulator is a nice deep tan color, but also some carbon and wet, oily residue. Planning to go a little leaner for the next ride and see.

Mate, your PJ setting would be way lean for me, I think. I considered mine too lean as delivered @ 1 turn out. Again, at that setting the top hit was very abrupt and it tended to rear up and take off like raped ape. Now it still has a strong hit, but controllable and I haven't found the limit yet even on the fast fire roads I run. With 13/46 gearing I haven't found the need for a 6th gear either...yet ;) . Gonna' try 14/48 soon.
First kick starts sound great, is that cold start!? :eek: Blubbering, rich plug and that fuel usage sounds like the rod is still too rich. Is there excess spooge too?

cheers
 
nah not much spooge(hardly any really at 32:1 catrol tts full syn 98 octane) but i make a point of really cleaning it out when i can!:D if its lugged all day it has a small amount around silencer end cap, 165 has a bit more near silencer/stinger junction but not absurd amounts by any means. i like the raped ape action TBH just want the bottom end sorted. keep in mind its still tail end of summer here so pretty hot, not much humidity though. mediterranean climate i believe its called(hot summers, cool/mild winters).

i found more than half a turn from seated(on 165) & fuel consumption went south & plug got oilier/blacker. was figuring the 300 would if anything be slighlty leaner in the top end than the 165(probably all over the range i guess) as it doesnt rev as high/often so i just started at that setting which seems good so far?! plug chop may tell a different story but didnt feel lean/rich at all just awesome power as it should be. 14/48 i tried slightly better top speed but made first too short(?) as in no good for real tight ST without frying the clutch.

yeh mate first kick cold/hot/warm/day/night/xmas/easter/monday mornings even. gentle cycle through to find TDC then one kick with no throttle(choke) or throttle without choke. i find normal kickstarters too long & cumbersome after owning the 300. quite like the old style mini kickstarter, honestly. if you havent used one before i can see how it seems weird but unless youve got real chicken legs it isnt an issue. sorry anyone with chicken legs:p
 
im gonna try a full mm leaner(50.5mm) but have a feeling ill be going leaner again, will see in a couple of weeks when i get to ride again. damn work:mad:
 
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