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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc. |
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#1
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EC300 Cylinder problem
Hi there,
I recently got my cylinder back from coating and rebuild the whole top end. After 5 hours of use the cylinder looked like the first picture. I asked the dude that coated my cylinder what could?ve caused those marks. He told me that the ring clearance was too small and I should get new rings and hone the cylinder. After I sent him the cylinder again to hone it and got new rings I put the ring clearance to 0.4mm on both the top and bottom ring. I rebuild it again, let it run for 3x10 minutes and the cylinder looks like that again. Has anyone on this forum have an idea of where those marks could come from? |
#2
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What does your piston look like? Do you warm it up properly before going hard on the throttle? 99% of two stroke rings barely need any clearance adjustments if at all.
To me that looks like a cold seizure.
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Back on a gassy! 2018 EC300! 🤘 Txt 280 07 to make me feel like a gumby again |
#3
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Hmm. If it were me I'd dress the areas with scotchbrite, open the gap to a safe 0.6 and never look inside again.
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#4
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Like I said, I didn?t give it throttle at all. I just let it idle with some 1/4 throttle in between to warm it up. In the second picture I didn?t even ride the bike. It came just from the idle.
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#5
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Quote:
W?ssner recommends 0.29mm for the tip ring and 0,36 for the bottom ring so it should be a safe Gap. |
#6
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Are you using an A, B, or C piston and what size was the cylinder plated for?
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WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220 |
#7
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Quote:
But clearly something isn't working. Youd lose no power. But hadn't considered SS109s idea??
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'07 EC300 GG '14 TXT250 GG '? 496 CPI Cheetah RZ/RGV hybrid '22 765 Street Triple RS '21 XTrainer '69 Stinger T125 Suzuki '23 TRS 250RR (it's a Trials thing) |
#8
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I have been running a Wossner with 0.4 end gap on top and bottom rings for years. Just an idea but are the numbers on your rings facing upward?
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2011 GG EC 300E, 1994 CR 250R, 1984 RM 250 E, 2022 Ranger 300 "If you stop eating donuts you will live 3 years longer. It's just 3 more years that you want a donut." ―Comedian Lewis Black "I think best when I have a wrench in my hands." Soichiro Honda "Dreams are messages from the deep." -Unknown Sardaukar |
#9
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A Piston with Cylidner plated for A Size
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#10
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Yeah, I made sure the numbers were on top.
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Tags |
cylinder, piston |
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