GP300/18 Power Valve Tweaks

[Doc Brown]

Just out of interest, anyone played with the PV adjuster already? Curious to hear how the engines performance changed.

Cheers Doc

[Gasser Nate]

Yep massive changes. Mine was on about 1 turn out, (soft) wound it out to 3-3 1/2 out turned it into a animal. 2 1/2 seems to be a nice balance for me. Enough zap to instantly lift the front if need be.

[memphis2857]

It makes huge adjustments. The bike becomes unrideable if you screw it all the way in or all the way out. 1/4 adjustments make a very noticeable difference. I run mine at 2 1/4 most of the time


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[Doc Brown]

Thank you guys, I'll give it a try then. I checked mine and it was at 2 turns out.

But I would like to have more zap in second, especially when chugging it up a climb with low rpm its a bit lazy when opening the throttle from lower revs...

Thx again.

Doc

[memphis2857]

Originally Posted by Doc Brown

Thank you guys, I'll give it a try then. I checked mine and it was at 2 turns out.



But I would like to have more zap in second, especially when chugging it up a climb with low rpm its a bit lazy when opening the throttle from lower revs...



Thx again.



Doc

If you are still using stock jetting, you need to focus on that first. The N1EF leaves tons of bottom/mid range power on the table. In fact it just plain sucks. Get yourself a NEDW or N3CH needle and thank me later. I prefer the N3CH


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[Doc Brown]

Hahaha, I thank you now. But not for the hint, for posting a reply

I run the JD kit and I am happy with it. The standard needle is really crap and I have no clue why GG uses it.

I have tried different PV settings yesterday all day on a 4mile loop conatining every possible terrain except rocks and stones.

1 turn out is calm and nice but also lazy and is no fun in the faster parts. 3 turns out is even worth in my opinion as there is literally no torque at all. It creates something like a turbo lag, its really a pain.

2.5 was way better but still had less torque than standard.

1.5 was best for me, torquey and pulling strong through the midrange with a bit less top end (which I dont need anyway). I dare say it accelerates as good as with 2 turns out but you need to shift while surfing on the torque wave.

In a nutshell, 1.5 works for me old bastard. Over here in Europe we ride a lot slower tracks than in the uS where there's a lot of very fast flowing tracks...
So its fine and I can chug up hills in a higher gear using less clutch than before...

edit: forgot to say I run 13/50 instead of 13/48

[memphis2857]

I too ride a lot of really tight, slow, extreme stuff, the harder the better. Did the 13/50 make a big difference over 13/48? I find myself on the big, long hill climbs needing something between 1st and 2nd gear.


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[Doc Brown]

Yes, definitely. 13/50 makes the second gear more user friendly, its a bit too long with 13/48. On the other hand you can ride easier climbs in thrid and it chugs up, in case it gets gutless you just feather the clutch where you would shift in second with 13/48.

I first tried 12/48 but that is unrideable in my opinion, its too short.
I then tried 13/50 which works fine, the only problem is the original 112 link chain is too short and you need a new one with 114 links.

When I bought the 50 teeth sprocket I also bought a 49 and it could be that this fits with a used original chain but I doubt that you will feel much difference.

[ropheo]

Originally Posted by Doc Brown

Yes, definitely. 13/50 makes the second gear more user friendly, its a bit too long with 13/48. On the other hand you can ride easier climbs in thrid and it chugs up, in case it gets gutless you just feather the clutch where you would shift in second with 13/48.

I first tried 12/48 but that is unrideable in my opinion, its too short.
I then tried 13/50 which works fine, the only problem is the original 112 link chain is too short and you need a new one with 114 links.

When I bought the 50 teeth sprocket I also bought a 49 and it could be that this fits with a used original chain but I doubt that you will feel much difference.

No, you don't need longer chain with 13/50 sprockets. You can reverse a distance blocks on an axle. I did it, on the begining chain is a little tight, but in tolerance.

[Doc Brown]

Yes when the OEM chain has lengthened a bit it may work, my dealer said the same.
I will try the 49 sprocket in a few days, the 50 is nice in second but the third gear now seems to be a bit short.