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Post by jaytheking13 on Feb 9, 2013 17:18:30 GMT -5
About a week ago i sold my 49cc lets 2 in exchange i bought a Yamaha Aerox pre modded by the owner.
It has a 70cc big bore kit
Leo vince Exaust
Water cooled with electric water pump
Racing clutch
Digital rpm metre and engine temperature
manual choke
Carb size, not sure how to check
Pod Filter
Seeing as i dont know much about performance parts. I just have a couple of questions
Whats a safe top cruising speed that will keep the engine in good condition?
Is it normal for me to hit 8000rpm before i reach 50kmph?
I was told that when i accelerate i should rev the engine to a higher rpm to get it to hit power band rather than just opening the throttle slowly, is this true?
Whats a safe engine running tempreture/rpm?
what other performance parts can i add ?
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Post by aznatama on Feb 9, 2013 18:20:11 GMT -5
Scooters use a CVT, which is designed to allow the engine to remain in the peak powerband the entire time while accelerating, and thus giving you optimal performance from an engine w/ a narrow powerband. You can accelerate however you like though.
Also, since it's a CVT, properly tuned and with enough throttle, it should be in the same RPM regardless of whether you're going 20kmph or 50kmph
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Post by jmkjr72 on Feb 9, 2013 18:47:28 GMT -5
well we would need to know what crank was in there before we say what the safe rpm is
if its an oem crank try to keep it at 9 grand they hold up for short runs over that but tend to fail on long runs over 9 grand
temps on my converted zuma stayed below 180 f
as for if 8 grand is normal well we would have to know what kit and what pipe it has on it
but if its a set up where power is in the 8 to 9 grand range then that is where you will spend most of your time
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Post by jaytheking13 on Feb 10, 2013 1:05:52 GMT -5
Well its a stock 50cc crank, so i assume thats OEM. And yeah i can even ride 60kmph and its in the 8-9 thousand range.
Last question, what would be the maximum safe riding speed that will give long engine life
Edit: Just talked to the owner before me and he gave me a list of all the mods
Have had this on a private road doing 116kph just fine, the acceleration is a surprise and is not for learning on.
Mods/Parts
69.8cc Aloy, Miled-Ported Mid-Race LC Cylinder
10mm Topend Full Circle Race Crank
24mm Mikuni TM24 FlatSlide Carb
-Main Jet 190
-Idle Jet 12.5
-Needle Jet Q-2
Exhaust Suited To Cylinders Power Output With Carbon/Kevlar Silencer
NGK SparkPlug B8ES
Bored Aloy Intake Manafold
Large Reed Block
UniFilter HiFlow AirFilter
HeavyDuty Clutch
-Engages At 8,500rpm aprox
ReRamped Variator
Longer Primary Gears
Longer secondary gears
Variator Cover, Stronger + Much Better Cooling For Gearing and Clutch
CNC Milled KickStart
MotoX HandleBar
MotoX HandleBar Clamp
Quick Action Throttle + Custom Cable
Spedo,RPM,Fule Gauge Cluster
Brembo Twin Pot Calipers With Braided Brake Hoses Back/Frount
Pirelli Tyres Back/Frount
13" Yamaha Aloy Wide Profile Rims
Paioli Shocks Back/Frount
Runs On PreMix 95octane and Full Synthetic Race Oil (R30 at 40:1)
The Crank Case has been Grinded To Match The Transfer Ports On Cylin
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Post by aeroxbud on Feb 10, 2013 5:01:25 GMT -5
Could still be any crank and kit, would help if you knew the brand
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Post by jaytheking13 on Feb 10, 2013 17:32:27 GMT -5
Thats all the guy knows about it, is there any indication on the engine itself? All i could find is its made in Italy
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Post by jaytheking13 on Feb 10, 2013 19:55:52 GMT -5
OK I did some searching and the brand is top performance made in italy . I looked at the website and I have a 50cc racing crank.
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Post by jaytheking13 on Feb 14, 2013 19:13:48 GMT -5
Any one?
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Post by 90GTVert on Feb 14, 2013 19:53:17 GMT -5
Stock cranks are often said to be best suited to 10,000RPM or 10,500RPM max. Your racing crank should be fine above that, but to what point I'm not totally sure. Since you say it's a mid-race setup, I would think you'll be just fine with whatever RPM the rest of the setup cares for.
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