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Post by jtron on Jul 16, 2015 20:10:59 GMT -5
Well I just adjusted my valves for the first time at like 800 miles, its working great now, imstead of 2-3 cranks to turn over it starts on tge first turn and sound rly happy now. Did .004 in .005 exh. It wasnt hard at all once I got the valve cover off. It was a little annoying getting the bolts off because of a lack of space to work in. Had to use a wrench instead of a socket for the bottom two. Anyways I was wondering how often most of you adjust? Is once every 1000miles adequate? I figure ill do it every 1000 and maybe sooner if I notice it taking longer to start or anything.
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Post by JerryScript on Jul 16, 2015 21:44:31 GMT -5
I do it every 1000 miles. I believe the manual states every 3500 miles, but I'm not certain.
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Post by rockynv on Jul 16, 2015 22:03:44 GMT -5
It can vary per bike along with usage. If you do much WOT riding the engine will tend to run lean and hot causing exhaust valves to sink into the head so that they get tight and will require more frequent adjusting. Sometimes the valve seats are not pressed completely in so on those bikes the first few adjustments may have to be done every few hundred miles. If you use a very poor quality fuel there may not be enough additive in it to protect the valves which could also lead to accelerated valve wear and more frequent adjustments. Oil quality and the frequency of oil changes can also contribute to the need for more frequent adjustments. You should listen and pay attention to how the bike runs. Plan on every 500 to 1000 miles but be prepared to do an as needed adjustment in-between if the warning signs become apparent. Hard starting, poor fuel pump operation, back firing or other performance issues.
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Sophomore Rider
Currently Offline
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Joined: Apr 3, 2013 19:46:08 GMT -5
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Post by bigmac on Jul 17, 2015 0:37:03 GMT -5
The owner's manual for my Yamaha Zuma says to change the motor oil every 2,000 miles and to also check the valves every 2,000 miles. The owner's manual for my Chinese scooter says to change the motor oil every 1,000 miles, but nothing about when to check the valves. From experience, I'd say it's probably best to check the valves with each oil change, so about every 1,000 miles. Plus, anytime the cover comes off, there is a chance for dirt and debris to get inside, so changing the oil afterwards will help flush out anything that may have gotten in there during the valve check.
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Post by rockynv on Jul 17, 2015 4:03:01 GMT -5
I really appreciate that the Aprilia 250 with the 4 valve head has a 12,500 mile service interval for checking the valves and goes 6,250 miles between oil changes. Much lower carbon footprint and allows more time to be spent riding. When I bought it a typical Honda Cloned 250 from a brick and mortar local dealer sold for $2,599 to $2,799 making the $2,999 Piaggio powered Aprilia 250 a comparative bargain.
The owners manual on my Lance (Znen) had you adjusting valves every 1,000 miles and changing the oil every 500 so I was changing oil 24 times a year and adjusting valves monthly.
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Post by tvnacman on Jul 17, 2015 4:49:23 GMT -5
Valve lash can be tricky, in the sense the seats can move around. I had to adjust valves like 4 times in like two weeks. Then its been thousands where it holds the adjustment.
John
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Post by hillbillybob on Jul 17, 2015 5:18:31 GMT -5
Well jtron, sounds to me like you pretty much have it figured out. If your engine usually starts the 1st or 2nd time over, but gets to where it takes a few more revolutions to get it fired, you'll know where to look.
Adjusted my Chinese valves a couple of times between 0 and 2500 miles. Guess things were pretty well settled in by then, because haven't adjusted them since (checked them twice, no adjustment needed). Scooter now at 7200 miles, so very shortly it will be 5000 miles since last adjusted. I might add that I don't hammer on my scoot, but instead, ride it conservatively.
Re-read what rockynv posted.... it doesn't leave much to be said
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Post by pistonguy on Jul 22, 2015 10:45:24 GMT -5
Valve lash can be tricky, in the sense the seats can move around. I had to adjust valves like 4 times in like two weeks. Then its been thousands where it holds the adjustment. John I don't think so. Ive never seen a Valve Seat "Move" and Not come out. If it moves its common out. And whats that saying for the Valve Job if the Seat is Moving around Finding a home? Seen some not in this application, we would just peen them back in and do a proper Valve Job. I don't see anyone taking into account the wear of that Fine Quality Rocker Assy, the Adj, side and the pad Follower, Also the Cam Itself. A Thousandth here and there and you have a few Valve Adjustments to do. |
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