#181
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I was hoping someone could confirm that myPV is working proper? It does stay closed at idle
https://youtu.be/pRd6anPzvuQ https://youtu.be/lzYAjvG-mnw |
#182
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looks ok
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EC250 2019 |
#183
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PV visibly moving from exhaust port
Hi gang,
I've spent the morning reading every post I can find about the Power Valve in hope of bringing power back to my '15 300. Question before I take the right hand side PV cover off is... If I twist the throttle with the engine off, should I see the PV move in the exhaust port?? When I twist the throttle, nothing is visibly moving, but I think it's because the PV moves from the centrifugal force of the engine. I'd rather not crack open the side if I can avoid it, but it appears I'm going to have to. Picture is the view I get as I peer into my baby's heart... (Tried to edit so it's not upside down, but couldn't get it right side up) Thanks, Rob |
#184
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No the power valve is opened by the engine revs, there is no mechanical link to the throttle so you will not see any movement if the engine is off
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2003 txt250 Pro 2013 Ossa 280i |
#185
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Yeah that is correct, it is powered by centrifugal force. If you look at the technical section at the first page before you select forum there are some good diagrams and articles on the power valve. Also, your power valve has an external adjuster that makes a big difference in your power delivery,( so I have been told.) so, you might want to check that first.
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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 |
#186
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One more thing that I haven't seen in the replies to your post.
Looking at your piston (in the attached photo) makes me think that you might want to do a top end job. The piston is streaked pretty badly. If your rings are also streaked, then loss of compression may be where your power went. A top end job might be best to ensure that your cylinder stays in good shape. Are you carefully warming your engine before loading it hard with the throttle? What oil and jetting are you running? My bike is in it's fourth year, and it has yet to scuff a piston like that.
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Jim Cook Smackover Racing Team LAGNAF '11 Gas Gas EC250 (primary ride) '06 Gas Gas DE300 2004 Gas Gas TXT300 Pro '94 Husaberg FE350 '86 Yamaha IT200 '86 Honda TRL200 Reflex '04 KTM 525EXC (soon to be dual sported) Several others, including project bikes, Deb's bike, and a fleet of grandkids' bikes Let's go riding! http://www.jebruns.com/Wudi19/wudi19.html http://www.ahrma.org/schedules-results/cross-country/ |
#187
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Quote:
In any case found this thread (and this post). I'm sure I moved the plate around with the arm attached during disassembly. However, the engine was off. Is this warning only for when the engine is running?
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James ------------ 2004 EC300 -- LTR Stuff, RB Designs Carb Mod 2016 Africa Twin 1975 Honda CB400 F1 (X2, projects) 2019 RE 650INT 1982 KDX80 2017 KAW EX300 1982 XL500R 2015 HUSKY FE501S 1972 HON CB175 |
#188
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Quote:
That being said it is worth opening her up and making sure. It is not a big job and you will be able to set the of slack properly
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2003 txt250 Pro 2013 Ossa 280i |
#189
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Well, I tugged on the rod a bit and it is nice and snug. I just pulled enough to feel the tension, but not move it. There's enough tension that I don't think I moved it during disassembly. I wouldn't have pulled it that hard. I think what happened is I moved the bracket, but since the stud is broken, it just fell out.
If I did lose a ball, how will I know? Can I start the bike and then tell somehow, or is the only way to be sure to pull the cover?
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James ------------ 2004 EC300 -- LTR Stuff, RB Designs Carb Mod 2016 Africa Twin 1975 Honda CB400 F1 (X2, projects) 2019 RE 650INT 1982 KDX80 2017 KAW EX300 1982 XL500R 2015 HUSKY FE501S 1972 HON CB175 |
#190
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Quote:
I have welded the stud back onto the pv bracket before, with good results. I first drilled the depression where the stud broke free of the bracket, to let me weld it on the "back" side. This let me do all the welding on the back side, as there is not much clearance for such on the "front" side. I used a small welding tip in my acetylene torch and used a very thin mild steel filler rod. If you do this, be careful to align the stud properly. It is critical to smooth operation. My GasGas Factory tech sessions told me to heat the nylock nut on the stud before removal, to keep from breaking the stud away from the bracket, and always use a new 5mm nylock nut each time I reassembled it. Good Luck and Good Riding! Jim
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Jim Cook Smackover Racing Team LAGNAF '11 Gas Gas EC250 (primary ride) '06 Gas Gas DE300 2004 Gas Gas TXT300 Pro '94 Husaberg FE350 '86 Yamaha IT200 '86 Honda TRL200 Reflex '04 KTM 525EXC (soon to be dual sported) Several others, including project bikes, Deb's bike, and a fleet of grandkids' bikes Let's go riding! http://www.jebruns.com/Wudi19/wudi19.html http://www.ahrma.org/schedules-results/cross-country/ |
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