Valves adjusted.. Does this sound right to you??  By  jromeo350420 (Read 2,919 times)

What lash clearance did you use?

First it should be .004 - .005 inch. Most people do .004inch intake, .005 exhaust. I have seen other swear by .003inch intake, .004inch exhaust. Once you get the process down its very easy to determine what your scoot likes.

Next is TDC. When turn the flywheel it should line up with the T mark. Sometimes it's a hair off but that's okay. The biggest thing with the 150s is only turn clockwise. NEVER EVER turn it counterclockwise when adjusting the valves. Even the smallest movement counterclockwise will cause the cam stopper to engage and cause the adjustment to not stay. That may be what's happening to you.

I'm sure some of the veteran members here have tips to ensure your are TDC. It took me 5 or 6 times to get the adjustment correct. Now I can do it in 10 minutes flat.

And a slight ticking is a good thing. But very light ticking. Once the ticking stops, that means you should adjust them again. From factory they don't tick. But that is because the valves are set to about 0.0 to keep the EPA happy.

i see this "T-mark" stuff all the time. the t-mark is "timing" as in spark, meant to be used with a timing light just like a car (although not adjustable without some mods so mostly useless) while close it does not indicate "TDC" like sooo many perceive it to be. even without mods the spark fires prior to tdc even though only a couple degrees.
that said you should always go by the holes in the cam sprocket (aligning the two small holes with the edge of the head and being able to see a larger hole top center) for tdc when adjusting your valves.
also, this anti reverse thing does nothing, and i mean nothing. never once has rotating my engine backwards affected anything ever and i have much experience in this (being scared from reading about said in the beginning, only to find......nada). i haven't edited my vid yet but will try tonight, but it clearly shows me spinning the cams forward and backward without a single glitch.
make sure you are at TDC with something along the lines of a chopstick. take your plug out, and while applying pressure to your piston using the plug hole as a fulcrum. slowly turn the engine forward and backward. you will feel the direction change just before and after TDC. do it until you are sure it is actually TDC, then check to insure your sprocket is aligned properly with the edge of the head. if not you will have fix this, and vids or with our help you can correct it, but going to assume for now it is correct, and your problem lies with using the "T-mark" instead of the sprocket holes.

dyoung1167

I agree that using the alignment holes on the cam is the primary method to obtaining TDC. I forgot to add that into the post.

As far as moving counter-clockwise I strongly disagree with you. Maybe you don't have a cam stopper on your engine, but OP may. It is just a very good practice.

This is a cam stopper.





And it's affects have been throughly discussed.
scootdawg.proboards.com/thread/8313?page=1

Cool thanks! Can you point me to a good place for info on getting my brake light to work? It's a combo bulb that worked fine its whole life, then after some work on the scooter a few weeks ago, it didn't come on for about a week. Then it came on last week, only for me to notice again today when I thought I was all done, that it is out again. I have wiggled all wires and the scooter starts fine. The running light portion has been fine. Maybe try a $2 bulb first?
BTW.. Should this be a new thread?

exactly what i have and will show tonight it's absolutely zero affect. i understand what is thought and for good reason because it LOOKS like it does something, but in the end it simply does nothing. the cam is fully able to spin quite freely in both directions and there is no linkage the affects the rocker arms either. i need to get a couple zip ties to keep it in place for a vid, as holding it by hand and rotating is a pain.