when you hear the noise put your hand on the speedo headlight mirrors to see if it goes away.

it's a low chuffing noise almost like a rock in the hub cap.
check the torque on the drive pulley.

wow... you did that?

@Lemur,

1. With or without rejetting we got rid of our low speed surging by simply adjusting the air/mix screw as per Lancer's instruction to set it to idle at it's fastest.

2. What camera did you use to shoot the video?

Lemer ,20mph ,up hill ,maybe you should be in first gear!

@TheNaughtyLemur: Batman gave me the same advice a little while back at it really changed my riding. I also installed a tach on the bike so I could learn to read the bike.

I used to almost 'lug' the bike at times because, being a new rider, and enjoying the torgue of this bike, I kept it at the lower limit for each gear.


I have since found that the bike is much more responsive (and I feel, safer, and the bike feels like it's more at home) if I run at higher rpm than I used to. I did some test riding where I could safely stretch out the gears, and you really can't hurt the engine with the throttle (that is not a challenge ... I know someone out there will take it as such!).

Just my two cents worth  

So I should keep cruising speed around 3500 RPMs? What should each shift point be, 4000 RPMs?

justin_o_guy2 wrote on 06/21/17 at 00:24:30:


Yep.....when you are accelerating briskly and want to get to speed quickly your shift points will be higher.  In the SCHOOL ZONE, on level or downhill and when using light throttle you can drop the shift points a bit lower.  I generally shift and cruise around at 3,000 rpm when I am riding at a relaxed pace.

The important thing is that you don't get in a habit of applying full throttle when your engine rpm is low.  If you feel the engine making "chug,chug,chug" power pulses...it is time to shift to a lower gear and get the rpm up a bit.

Lemer ,Take your bike to the hill in question ,pretend that there is a mad dog that runs out and wants to eat your leg for lunch! Your in  2nd gear going up the hill @20 mph ,open the throttle ,and your speed barely increases ,the dog takes a chunk out of your leg, you were in the wrong gear! now start up the same hill either in 1st gear @20 mph or 2ndgear @30 mph when the mad mutt runs out you open the throttle and the bike pulls away briskly leaving the mad mutt breathing exhaust gas and your leg intact ,you were in the right gear at the right speed.You don't need to keep the bike at 3500 rpm ,you might be fine in 2nd gear at 20mph on level road(school zone) but not going uphill, your putting extra load on the motor(the hill) and you need to raise rpm to provide more power the closer you are to 3500 rpm the easier it is ,at 2200 rpm in 2nd your just beginning to make torque ,which makes it hard for the motor to increase  rpm.