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Enduro Intake/Carburetion - 2 stroke Jetting, Reeds, Air Filters, etc. |
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#1
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so i replated my top end, and it's been broken in. i still need to re-shim my pv, it clatters, i could see the slop when i reassembled, just haven't gotten to it. gonna do it when i fix my kicker.
but here's the issue: it seems to load up when i wack the throttle, and struggles to get on the pipe/rev out. i can clutch it, and zing the throttle a few times and it cleans up/will rev out. or if i hold it wide open it will eventually get on the pipe. until then, it stutters like it's rich. my normal jetting on this motor at this elevation and temperature has been perfect in the past: 1.5 a/s, n1eg #2, 172, 42pilot. i dropped the needle to #1, and it didn't fix it. i leaned the a/s to 1.75 and it didn't fix it. the plug does not look rich, nor does the bike act rich except when i transition from the pilot directly to the main. like exiting the woods onto a big straight. 1/4 throttle to 3/4-wot... i don't want to go leaner on the main, when it eventually gets on the pipe, it's running great, it's just the getting it to that point that's the issue. yes i've changed the plug. bike runs perfect up to 1/4 throttle, and if i stay on the pipe it runs great, it's just got this big stutter in between sometimes... i thought it was jetting, but maybe it's powervalve flutter? i don't have it against the stop yet, i can hear it clunking... any suggestions????
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() Last edited by stainlesscycle; 08-28-2012 at 04:31 PM. |
#2
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Make sure the power valve is working- many threads on proper preload. no preload will also cause the rattle to be worse.
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Fred Overstreet 2010 EC250 SixDays 2004 GasGas EC300 -Sold to a good home 2006 GasGas EC250-Sold to a good home 2006 GasGas TXT 280 Pro ![]() |
#3
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yeah, pv is working, i know the preload procedure, just didn't do it - hadn't had a chance to get to it - was racing other bikes in the last few weeks, just through the top end on and went racing.. pv alignment changed when i put this top end back on. pv is definitely opening. also, i can hear it rattling against stop when it's fluttering.. would pv preload cause that much of a 'lag' i would think it's still opening properly, just not shutting properly..
either way, guess i gotta go in there and set it back up. maybe that will fix it.
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() |
#4
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PV won't do that. Sounds like bad reeds to me.
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#5
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hadn't thought of that. haven't looked at them in about a year. might be time. 07 is vf3 right?
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() |
#6
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Lonetree had the same issue with his 09. Chased it around for weeks and it turned out the spark plug cap had untwisted a bit and would break up under high rpm. Go over the electrical agains and also check the reeds.
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#7
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will change the cap, but its fine at top/not breaking up. it's just getting there that's causing the problems. bike starts and idles fine, which i've found is usually a good indicator of reed condition
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() |
#8
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#9
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preloaded pv, of course the rattle is now gone
![]() doesn't appear to be loading up anymore, maybe the pv was so loose it was sticking occasionally? but i won't know 100% till i race it this weekend. going to reset the needle back to #2 and see if it's fine... still have to tear into reed cage and take a look. maybe tomorrow. got some other bikes to work on. EDIT : oi had a chance to ride it a bit more.. still loading up. going to 170 main and see if that fixes it. that seems lean for n1eg/2000'/80 degrees. gonna have to do some plug chops. ' '
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() Last edited by stainlesscycle; 08-29-2012 at 03:11 PM. |
#10
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170 main doesn't fix it, although it makes it a bit better.. i can duplicate the problem. i do a slow rolling start in 3rd gear and wack the throttle to about 3/4 or more.. it accelerates clean, then stutters and then finally gets on the pipe maybe 150 yards later. if i keep the revs up, it will pull clean. if i drop it back, let bike slow way down, and try again it stutters. maybe it's not jetting. gonna check reeds tomorrow.
this bike ran perfectly fine on 172 main before i replaced top end. the pv is working, and opens/closes smoothly.. i dunno what else it could be.
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07 ec300 was 00 xc200 now a 00 xc300. now parting out. 99 ec300 (now a pile of parts which are for sale) Stainless Cycle - Motorcycle Bolt Kits www.stainlesscycle.com ![]() |
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