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Model Forum / Radio Controlled / Land Models / September 2006idle and lsn?
Quick question (sorry if you've seen this on another board.. lol) Tuning my 3.3 Maxx tonight I was having issues. My 4th return because I found out my idle gap was way too big.. linkage issue which has been adjusted. It was always 2-3mm and LSN was always 2-3 turns richer than flush. Just didn't seem right. Now I've got the idle at 1mm (or less). It will start.. a little throttle is needed. HSN is tuned fairly good. Once up to operating temps it ripped a lot better, more steady smoke than before. But, after stopping.. idle seemed to dip a little, then rise for a couple seconds then drop to normal, then die after about 10 seconds. My guess is too rich LSN (and HSN is a tad rich). Engine loading up? If I lean the LSN at idle should the idles increase? If they don't, is it WAY too rich? :) Hello Bradley, I'm not an expert but this is my 2 cents worth: > But, after stopping.. idle seemed to dip a little, then rise for a > couple seconds then drop to normal, then die after about 10 seconds. My best guess is that your engine is not broken-in (run-in) yet. Once it is properly broken in, "after stopping", if: a. The LSN is rich, the idle will dip and if you let it idle for 20 seconds and try to trottle off, the engine will either cut on a drowning note, or it will move off very sluggishly while the engine tries to spit out all the excess fuel. If the LSN is too rich, the idle will dip and cut the engine in less than 10 seconds. b. The LSN is too lean, the idle will increase in speed. And if the LSN is really lean, it will even start to 4-stroke after 10 to 15 seconds. c. The LSN is just right, it will purr nice and consistent. After 20 seconds if you trottle off, the engine will kick right into action nicely. My suggestion is not to tune it anymore, just increase the idle speed a little, maybe 1.2mm and run the engine for at least another 5 tanks before you re-check the tuning. One of the other problems that you need to be aware of, if you have been running your engine for quite a while - which means the engine should have been properly broken-in (run-in) is to check the condition of the clutch shoes and clutch springs. If the clutch springs are bad, it initial idle dip would be due to the fact that the sping could not close the clutch on idle so it got stuck to the clutch bell. When you stop the bell stop and engine went down in idle, then the spring gets unstuck by the remaining tension and close, now you hear the engine idle going up and finally the engine cuts - this engine cut could then be due to various factors: i. Engine idle speed too low. ii. LSN too lean, so not enough fuel going in at idle. I hope, I didn't confuse you and hope the above helps Best Regards phlim Thanks for the suggestions. It's broken in. :) going on 2 gallons soon. Used heat cycle method to break it in. I just was never happy with the low end performance of it. I got it ok one time, but weather changed, I started tuning and must have gotten too far off. Plus slide wouldn't close all the way using the idle screw. I'll figure it out. high idle also tells me too lean, but it's after 2-3 seconds after a WOT run, then it drops back down for 10 seconds or so before dying. Could be anything I guess. I'll keep playin around. :) Time is the enemy with these things.. lol.. days are gettingn too short. > Hello Bradley, I'm not an expert but this is my 2 cents worth: > [quoted text clipped - 37 lines] > Best Regards > phlim > Thanks for the suggestions. > [quoted text clipped - 11 lines] > I'll keep playin around. :) Time is the enemy with these things.. lol.. > days are gettingn too short. Dude, I have an idea, but it's not a good one. I think your engine might be pooched per way of piston/sleeve wear. The first sign was loss of wheelies (aka loss of power), and now she's being a bugger to tune and you're having trouble with the idle especially. The first sign of a worn motor is "tune chasing" and the next is difficulty idling/stalling when idling. You already eliminated EVERYTHING else per your prior posts, this seems to be the next logical assumption. I'd pop the piston and sleeve out and see how much pinch you have left. The piston should start getting difficult to push up on around 1/4" from the top of the sleeve and at 1/8" or so it should be pretty much stuck. Hope this helps, and I hope I'm wrong! Doc > Thanks for the suggestions. > [quoted text clipped - 8 lines] > 2-3 seconds after a WOT run, then it drops back down for 10 seconds or > so before dying. Could be anything I guess. Now that you have the throttle linkage closing all the way and the idle clearance set to what the manual suggests it might be worth putting the LSN back to flush and starting all over again with the both needles. I know tuning the LSN its a painful task. > I'll keep playin around. :) Time is the enemy with these things.. > lol.. days are gettingn too short. Hmmm, I thought our days were getting longer. Bring On Summer!!! Cheers >Hmmm, I thought our days were getting longer. Bring On Summer!!! > >Cheers Are you one of them guys on the other side of the planet (Aus or NZ)? Just wondering. . . > >Hmmm, I thought our days were getting longer. Bring On Summer!!! > > > >Cheers > > > Are you one of them guys on the other side of the planet (Aus or NZ)? > Just wondering. . . Yep, sure am. On the West Coast of Oz. Cheers >> >Hmmm, I thought our days were getting longer. Bring On Summer!!! >> > [quoted text clipped - 6 lines] > > Cheers This Sunday!!!! Daylight savings starts!!! (or finishes, I allways get em wrong) WOOOOOOT! Wont get dark till late, cant wait :) I'll be able to get back into riding after work everyday, working on my 1:1 cars, RC, yeeeeeewwww! Cheers Dre (in Oz as well) > b. The LSN is too lean, the idle will increase in speed. And if the > LSN is really lean, it will even start to 4-stroke after 10 to 15 > seconds. 2-strokes only run in "4-stroke mode" when they're excessively rich, not excessively lean! Everything else was spot on IMO. Doc > Quick question (sorry if you've seen this on another board.. lol) > [quoted text clipped - 14 lines] > If I lean the LSN at idle should the idles increase? If they don't, is it > WAY too rich? :) Hah, I have *exactly* the same issues with the Revo this weekend! LSN was oddly weeeeey too rich (attributed to change in fuel/HSN/leaky coupler/voodoo magic) and it was loading up and stalling, and before twigging this I cranked the idle up to the point where it was driving off haha :D Sorted now though! Maybe try richening it just a bit to see if it helps...?  SignatureDan |
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