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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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High speed bump performance change?
Hi 2t gurus, I need some help. I have a new to me EC300 08.
The fellow I bought the bike off of told me the float needle jet was leaking. I fixed that by just cleaning it out. Checked the float level and it was at 16mm. I got that measurment from the carb site. Then on my second ride I was going down a trail in 4th or5th gear at a good clip but not on the pipe, say mid rpm range. Then when I hit a 3" to 6" rock or root the exhaust note would change to pap pap pap... and I would lose half of my power. So I backed out of the throttle, shifted down, then rolled on the throttle until I hit the pipe and it seemed to correct its self. Doesn't do it every time, but anytime is to often. The only things I can think of are: Carb, exhaust valve/power valve ( are these the same thing?) or reed valve? I hope some one can help! Len. |
#2
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My '07 300 does the same thing. It feels and sounds like a 125 when it happens. I'm pretty sure it's the power valve. I bought mine used, and after it did this the first time, I took the power valve apart, and cleaned a bunch of carbon off it. This helped for awhile, but it's progressively coming back. I meant to talk to the gofasters guys at a couple nationals, but never made it. I've also not had time to research further on this board. I'm running bel-ray H1R at 50:1, if it matters.
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'01 xc 250 '07 ec 300 w/2k2 |
#3
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I am going to do the same. There is a thread that sounds like the same condition on this site. I have decided to do all the things one should do when you buy a used bike. I have started with the muffler, which the guy said was due for a repack. And boy it sure does. Doing my second over night soke with easy off overn cleaner to losen all the carbon up. I will then have a look at the power valve. My father inlaw is a rider and a master mechanic and he said to make sure all my carb vent hoses are cleared as well, and go over the carb completely. I'm running MotorX 100% synthetic at 50:1. The previous owner ran something else at 60:1. I talked to the dealer, and he said that with the synthetics you can run it at that ratio which is 1% instead of 2%. But he said I should stick to the 50:1. I will let you know if I make any progress.
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#4
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It's usually not the oil ratio or brand that causes spooge, your jetting needs to be correct.
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#5
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Spooge/ oil mix
One small note here. Don't get yourself confused with the oil percentages(1%, 2%, etc.) 1% is 100:1, way too lean on the oil and your jetting will be too rich. I would guess carb vent hoses for the problem you described. Let us know what you find. Jim
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#6
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I believe I have solved the problem! I started with the PV. It was completely encrusted in carbon. I must have spent 2 hours just cleaning it. When I opened up the right side the actuator arm would stick 2 thirds of the way to the top every time I moved it up and down. Once clean and back together it moved nice and smoothly. Went for a ride today the bike ran perfect. I did not touch the carb because I wanted to know what fixed it. The PV didn't do it, then I would have went on to the next item on the list. I guess with a 2t that will be one of my routine maintenance jobs.
Thank you all for your help, much appreciated. Len. |
#7
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Quote:
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#8
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For the most part I used brake clean, dental pick, and a wire wheel in my drill in the places and parts I could, not to much preasure. All the parts appear to be a hardened steel like a valve, so no marks or scratches were left on the parts. The bearings I sprayed with the break clean and wiped off right away. The bearings seemed to be in decent shape. I took the # off them, as well as measured them and will check with the local bearing dealer to see if I can get them cheap. When using the dental tool I was carefull to scrape with the side of the pick and not the direct point.
Hope this answers your quest. Len. |
#9
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One thing I forgot to mention. I could not get the piece inside the exhaust port out. (spiggot) I think it was called. It appeared to be free of carbon when I looked at it with the trouble light, and it moved freely. I did not want to force it. In the instruction it sounded like it should almost fall out.
Any ideas for that. Len. |
#10
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Not sure, all I can report is that mine is the same, loose and also free of carbon.
Thanks for your help! |
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