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[sadunbar]

With the right tuner you can slow the blade down, however with some builds it can still be touchy my 124 with the 640 and the 66 mm is not the smoothest , however the HPI 62 unit is much smoother due to the design of the entry. They have it built up above plate on the bottom so the small opening are not moving as much air . Makes for a extremely smooth low opening .   However the SE 64 is a nasty mother to tune and the stream inj they have are icing on the turd cake ..

I ran an HPI 62mm throttle body on my 120 motor for a bit, but replaced it with an HPI 55mm throttle body due to difficult low speed maneuvering.  The low speed throttle response was much improved with the HPI 55mm throttle body.  It was tuned with both throttle bodies by Josh Hansen - a very capable tuner.  This was with a cable driven throttle body.  Perhaps there are more tuning options with a FBW throttle body...  I don't know...

[Unbalanced]

I have the 62 HPI on 2 bikes and have no low end drivability issues, both have 6.22 injectors.   Maybe I am just lucky with Sach's porting and Ed Dahir and Rob's tuning


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[hrdtail78]

I have tested the HPI 55, 58 elip, S&S 66 and the HPI 62 on on my 124r with 662-2 cam.  In that order.  I saw no more power with any of them.  TB wasn't the choking point and I have a streetable redline.  6200.  Parking lot drivability, TB noise, and throttle response was a big difference in the test.  The 66 was the turd.  More to TB's than the size of the blade.  Shape of the manifold, bell mouth, and bifurcate will all play along.  The HPI units being a 2 piece is also an advantage.

Sounds to me like the dealer put you into one of their most expensive part builds that in the end will be a waste of money that wont put out any more than a well thought out, bang for the buck, proven combo build.

[fresch]

Heads:
2.100 Intake Valve    (stock 2.08)
1.650 Exhaust Valve  (stock 1.63)
Hand ported Bowl with short turn radius
Thermal Coated Combustion Chambers,Ports and Valves
Jims Roker arm bushings
Zippers competition valve job with step guides and lower collars
Viton Valve seals
Skimmed head gasket surface

Piston/Cylinders:
+010 Oversize 10.5:1 Forged pistons (515 grams)
Thermal Coated Piston tops
Machine piston pin boss to 1.200+ for Dark Horse Rod
Zippers Cylinder Studs
Bored Cyliners with Torque plates

Flywheels and Cases:
Zippers Left Side Sprocket Timken Bearing Conversion
Dark Horse prepared Flywheels with Lighten Screamin Eagle Flywheel and
Dark Horse Connecting Rod
Balanced and blueprinted assembly.

Cams:
Redshift 657-HS Cams
Torrington Cam bearings
Fueling Billet cam plate
Zippers dual-piston cam chain tensioners
Zippers Bypass Valve
Fueling Billet oil pump

Intake:
51mm/1.800 Throttle Body
4.89 Injectors
Zippers Hi-Flow Air Filter Kit

Exhaust:
D&D 2:1 Boarzilla

Ignition:
ThunderMax

Final Drive:
O-Ring Chain

zippers built this.
my build, is it fast, yes and very rideable. 135 tq 130 hp
was it worth it id say no way, your more than welcome to come up and ride it