2 questions. Rev limit and service manual  By  jjt (Read 1,332 times)

I have a valley/hill to go thru to get to town so I make a run for it....7,200-7,400 everyday.
Be very Picky with your Valve Lash.....
My current CVT tune, I GPS'd her at 64.8 mph@7,400rpm, and yes she is Bone Stock internals.
There is a whole bunch of speed to be had in a properly tuned CVT. One need to know ere to look..
Check that Belt Climb on the Vari. there is much to gain and lose there..
                           Good luck

One thing on above 60mph speed on my Hunter Phantom style scoot, The Forks have only one clamp and this ride is a really sketchy getting scary ride at those speeds. It really wasn't fun, to the point of just darn dangerous.

Thanks for that link piston. Looks like I have more left in there than I thought. I haven't tried to tuck yet I'm trying to get 60 in a normal riding position. That may not happen unless I try a downhill speed run lol. Hopefully today or tomorrow I can check the variator to see how high the belt is going. I haven't checked it since putting the dr pulley variator on. I want to try the lighter sliders as well.
I was wondering when I was going to hit speeds where it started feeling unsafe. I haven't pulled my forks yet to see if they are serviceable.(I haven't done any research on it yet either). If they are I thought about seeing if I could add a touch more preload. I think I'm a bit heavier than the average guy that Yamaha assumed would be riding a 50 lol. Honestly at the speeds I'm hitting so far it feels rock solid and even as small as the front brake is , I am very impressed with the braking power.

Hey man I just seen the link for the gy6 manual. That's awesome thanks

Cool beans, your getting there..

Pistonguy,

Here's one WE can TOTALLY agree on!  Have a bone...

On my old Xingyue 150 I had your same results.  Getting the CVT just right made more difference than anything else.  These GY6 engines do put out around 1hp per cubic inch, which is decent.  Tweaking the CVT tranny allows you to get the most from that approx. 10hp...  Each scoot is different, but tweaking the CVT is probably more rewarding than most other "mods"... especially the roller-weights.

I traded "Lil' Bubba" on my "new" old Kymco before having a chance to try sliders, but from posts I've seen, they may be better than rollers for all-round performance by allowing the belt to more fully use the entire variator.

The CVT tranny may not be the absolute best setup ever devised, but it's simple, easy to work on and still works extremely well, especially when you take time to get it all "optimal"...

Ride safe,

Leo in Texas

On setting valve gap

Ideally there is almost zero gap between the cam lobe and the rocker arm when the motor is hot. Just enough for a thin layer of oil and nothing more
That's where you get the most valve lift and least float and wear
Unfortunately this wonderful ideal lasts about a week under lite use and moderate RPM and then the great power starts to just get dumped out your pipe
Cased by a failing exhaust valve seal
The exhaust valve is bigger gets hotter and is dealing with a more abrasive medium so it goes first. Soon after that, the seal is bad enough to cause cold starting problems.

In my experience a new stock motor loses about .4 to .6 thousandths a month that's .0004 or .0006 of an inch
And a valve will grow a thousandth or two more than than the head will when heated to normal operational temperature

So you add in the extra valve gap you need to compensate for thermal expansion and a few more thousandths so you don't have to do it again in a month

And now you have all the information you need to know what your doing with a valve job

The how can be found on YouTube