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Post by dickyh on Sept 21, 2015 18:21:54 GMT -5
Ok I've adjusted valve lash many times and no problems. yesterday I adjusted the exhaust a little bigger than usual about .1143mm .045". Put it back together and on my way to and from work it was popping on acceleration and then on the way home, it starting idling roughly. got it home let it cool down and took off the valve cover and went to adjust the clearance and the exhaust has 0 clearance. and now the scoot wont start.
what did I do and how do I fix it? Ive had this for about a year and have always done everything myself, maintenance wise and never had any problems.
It is as if the exhaust valve is stuck? Did I just really screw something up?
My scooter is my main transportation and I need this back on the road. any help would be GREATLY appreciated!
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Post by rcq92130 on Sept 21, 2015 18:26:25 GMT -5
OK, I get that you have done this many times, but normally when soemthing like this happens it's because we have forgotten some dumb little thing and finally smack ourselves in the forehead when we figure it out.
Since you didn't post photos, suggest you look into the thread just below this (now titled "tranny gears: Martin's Superfast ..."). The
NEXT TO THE LAST
video on the last page (I think) is a really good, simple walk thru on adjusting valves - would get that forehead smack going.
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Post by dickyh on Sept 21, 2015 19:36:40 GMT -5
Thanks! i watched the video 5 times and still don't get it. I guess I'm a bit stressed over this right now and not thinking clearly. I'm sure you are talking about the clearance settings and I think I'm doing right. I have a feller gauge that is reading inches and mm. i.e. .020 " is .508mm. could you give me a little nudge here please. what am I missing?
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Post by JoeyBee on Sept 21, 2015 19:52:14 GMT -5
What size engine do you have?
150cc = .004 inch intake / .005 inch exhaust
50cc = .003 inch intake / .004 inch exhaust
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Post by rcq92130 on Sept 21, 2015 20:01:54 GMT -5
.005 inches is 10 times smaller than .05 inches (5 times smaller than the .02 inches you listed)
Maybe that is the "DOH!" issue ..... ?
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Post by JoeyBee on Sept 21, 2015 20:20:31 GMT -5
I agree with RCQ. I would go back, be 100% sure you are too deep center (TDC) then check your measurements.
Not sure which video you watched, but this one is very good, and short.
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Post by dickyh on Sept 21, 2015 20:59:47 GMT -5
thanks! took me awhile... went and got another feeler gauge cause the other was too confusing. going to set these in the morning.
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Post by dickyh on Sept 21, 2015 21:01:15 GMT -5
I actually have a 169cc engine. does this make any difference on settings?
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Post by JoeyBee on Sept 21, 2015 21:11:10 GMT -5
I have a 150cc, and I have it set at .004inch / .005inch. I get a light tapping which some people find annoying. But I go by, light tapping is good, no tapping means valves need adjusting.
If no one chimes in with your size motor that tested various setting, I would try .005inch intake and .006inch exhaust. If it taps to much you may have to back it down to .004/.005. Getting the exact settings that your engine like is trial and error. But once you find that sweet spot it will be very easy for readjustment.
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Post by dickyh on Sept 21, 2015 21:20:24 GMT -5
JoeyBee Thanks! I just set them to 4 and 5 , but no luck... will barely start and won't idle. I hope i didnt screw anything up by setting them so loose yesterday. I did notice that the exhaust sounded MUCH loader than normal. Could I have screwed something up? I've been adjusting the valves every 3K miles for about a year and it has never been this temperamental.
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Post by JoeyBee on Sept 21, 2015 21:30:39 GMT -5
I'm a little confused about what you initially set the valves at. Your first post said .0045" then your second said .020". That's a wide range from too tight to too loose.
Could you please clarify this. Because both ranges cause different problems.
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Post by dickyh on Sept 21, 2015 21:42:58 GMT -5
I initially set them at .045 (a REALLY big gap)
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Post by lain on Sept 22, 2015 6:37:33 GMT -5
Set them to 0.004 inches. Both of them. Not sure why you say 0.004 is a very large gap to you, to me it is thinner than my fingernail! What are you comparing the gap to, a dust particle? lol
Did you first set the gaps when the engine was cold? It sounds like to me you were setting the gaps while the engine was warm which is going to completely throw off your adjustments. You can set them all day and night long but if the engine isn't cold then you're just killing time and most likely giving yourself a headache. Make sure the cam is at top dead center and the 2 small holes line up with the engine casing.
It may also be possible you have multiple problems and you just can't see past your valve issue because it is the most prominent issue at the moment. I've never had popping sounds from poorly set up valves. However if you loosened the 4 bolts around the cam you may have pulled the head off the cylinder a tiny bit while you were working and damaged the head gasket. Once it separates once even a tiny bit it can form leaks because the way the gasket is made is to only be torqued down once and then never removed. It kind of sounds like this may be the underlying issue.
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Post by dickyh on Sept 22, 2015 6:54:56 GMT -5
lain .04 is a large gap. which i was thinking was .004 thus was about a 1/4 of an inch. Everything was fine until i opened the gaps. at first the scoot started right up drove with some popping but on the way home last night(after about 7 miles) it kept trying to stall and when i turned it off at home would not start. I have been readjusting when engine is cold and if i lay on the throttle when starting it will start but not stay running. when i do have it running the engine sounds louder than normal and sputters when i turn up the throttle. the scooter was running ok until now and i only adjusted the valves because it was getting a little harder than usual to start. and when I opened the gap it did start right up at first, but now I am afraid I may have done some damage to it. BTW, I have fuel injection, if it makes any difference
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Post by dyoung1167 on Sept 22, 2015 8:00:52 GMT -5
pull your plug and turn the engine by hand a few times and watch the valves to see that they are moving properly. if they seem to be, you may have to pull the head and check inside. those big clearances cause a lot of pressure, flow, and no flow at the wrong times. you may have bad valve seats, burnt piston, or what not currently giving you a not so healthy combustion chamber.
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