Valve clearance adjustment

[ispud]

Think I am going to try this this weekend.  I have found some step by step with pictures posted by someone - found same info on three or four sites.  Have info from the service manual.  Anyone have any tips they want to share before I start undoing stuff?  Gap is .1m which I translated to .0039 inch - going with .004 feeler gauge.  I will post here any info that surfaces when I plunge in.

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[wordslinger]

..I've adjusted my Agility 50 valves several times...Top-Dead-Center is the key...It's fairly simple to do, and the benefits are great...If your valve clearance is out much, you will even notice that your motor sounds different...more throaty...and you should feel a bit more pep gettin' on the throttle..

peace

[ispud]

I have valve adjustment area exposed - they seem very tight - .0015 INCHES - and they should be .004.  I was hoping they would be right on and I would not have to adjust them.  I am going to go ahead and give it a try as long as I've come this far.  It's taken me about 2 hours to get to them - had to stop and figure some stuff out - ripped off an index finger nail - ouche.  Plug from lighter was hard to get undone - looks extremely complex for just hooking 2 wires together.  There is a little thing with a spring that appear in the opening when you pull the cover off the hole where you turn the engine - tryying to find in the shop manual how they go back in.  My wrenches beckon!

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[ispud]

got it done - took me forever, but I think I got it all back together and running with no extra parts on the counter - always good.  Was hoping this might help with the gurgling noise I hear at low speeds when I accelerate - kinda random bubbling noise - seems to fade away at speed.  Both valves were very tight - I wonder if they were set at factory this way and if so why - only been 300k - 180ish miles since they had it open in Taiwan - saw an October 2008 stamp on some part I took off - not sure it that was part date or date scooter was assembled.  Tough job - took me 5 hours - next time I should be able to cut that in half.  I put two pieces of 2x4 (shortys) between the engine and the colored plastic body halves (prying them open), made access much easier.  When you line up the "T" it can be in wrong position - make sure hole in chain pulley is where they show it - you may have to rotate it some more.  All the pictures are trick photography - no way they could get those pictures without having the engine out of the scooter - tight tight tight.

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[zombie]

I'm sorry I didn't read this post sooner. All of the engines I have worked on required the engine to be warmed up BEFORE the final valve adjustment. This compensates for the expansion of the parts. Perhaps Kymco has taken this into consideration w/ their specs., but I would try to find out from their tech. support. 1mm cold could easily be an open valve when hot. Not trying to throw a wrench at you, it just seems awful tight for a cold adjustment,which I believe could give you some resonance through the intake or exhaust. (bubbling sound) Ps I would try to get an answer from a top tech, not a mechanic! Sorry if this affects your sleep...

[ispud]

all instructions I had said to set them cold - gurgling was there before and remains unchanged.  I will however keep my eyes and ears open.  I have been trying to find a forum for people who work on their ps250's so I could benefit from their combined experience- know any?  This one is best I can find, but activity here is very limited.

Not sure I understand what you meant - I opened the gap - it was way tighter than .1mm.

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[OldGuy]

Sorry. I'm  a little late for this time around. When adjusting valves I always use 2 feeler gauges. In this case I'd use a .003" and a .005". The smaller should fit and the larger not. That way you don't get them too loose.

[ispud]

I went tight on the .004 and .005 would not go.

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[zombie]

I found it in an older post from aeromyst  http://www.scooterinvasion.net/forum/viewtopic.php?t=813

[wordslinger]

...Agility 50 clearance is .04mm....which is equal to .00157 inches..

..and I always perform this adjustment warm...

peace

[zombie]

Hey wordslinger, Just to learn something for myself, are there any type of hydrolic lifters, or something similar in the valve train. That spec would quickly disappear if adjusted cold. Perhaps it is the way it's engineered. Just curious.

[wordslinger]

...zombie, no, I think it's all 'Push-rod"...but i've checked my clearance both cold and hot...really pretty hot, and have not been able to detect a difference...I was concerned about such close tolerance...afraid that I would burn a valve...I've been setting @ .04mm for over a year now...works great for me...

peace

[zombie]

Thanks Bro, Peace!

[kawzak]

Most every valve adjustment in any manual  I have seen has been to check/adjust cold-as in overnight cold. And as far as the gurgling sound goes- maybe you are hearing the noise produced by the air by-pass system that forces air into the exhaust system at the head-just like 1980s BMW motorcycles did. simple system to clean up the exhaust, but makes this weird pop-corn or gurgling noise on accel.

[jprestonian]

I always described my accelleration sound as being "woody, reedy." Like a reed of wood slapping something solid.
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