Does anyone know how to tune these up a little?
they seem a little low on speed compared to smaller kid quads.
I read that they go 40-45mph, but have tested one and it is much less(32mph)

 

I don't have one of these yet. But, i am getting one in the next few weeks for my 9 year old son. He weighs in at a hefty 75 lbs.. Back to your question, have you tried the usual mods. Like removing the airbox lid or drilling 1" holes in it, rejetting the carb, or exhaust?

 

I just bought one (Yamoto 150), I am overall happy with it. My daughters (6 & 10) ride it more than they did their '01 Eton(Sundiro). I didn't try any mods, I want to get a definite starting point first. I was told that they go 40-45 but the one I just bought only hit 32mph. I must say though, it does seem to have a bit more power/speed now that hey have broken it ina little more(less than a week old). I'll have to get the radar gun again and see.
once i get it going like advertised, I may try a few minor mods(airbox tricks,jetting...).

i left some views in another thread about the 150cc 4 stroker here are some more.
heavier than other kid quads
stable (great tires)
smooth running
great looking (Yamaha Raptor Style)
good on gas
cheap shocks/ not adjustments
stiffer riding for the smaller kids
great value ($1000-$1500 shipped - on ebay)

 

I bought one of these for my wife and have not clocked it yet,but when I rode it, it seemed like I was going less than 35mph.It did seem as though it had some kind of rev limiter though.The wife is thrilled with it and does not have any complaint's so far.She has probubly not had it past half throttle yet and may never.I will be posting a thorough review soon,and have already made some new part's for it.I am a machinist and have a good supply of aluminum stock.I will list mods when I do my review.

 

well i radared the 150 yamoto again, but it was with my nephew on it(15yrs old 6' 175lbs.)
he got 34mph with it. It's still is far from the 40-45mph as stated in the quad's description, but it has gained 2 mph even with a 100lbs more on it, since it has gotten broken in a little.

 

If it's broken in, it's time to take the restrictor plate off the air intake. This is actually a standard procedure. I think it's mentioned in the manual, so it doesn't even qualify as a "mod". You'll notice a decent increase in performance and some increase in sound.

 

Where is this restrictor plate located? In the air box, or in the carb? It is not mentioned in the manual I have.

 

bore it out

 

In the airbox. I thought it was mentioned in the part talking about the break-in.

 

Hello my firts time here =) i cant fins that thing in the airbox???

how dose it look??

im from sweden so my speling is not the best sorru