Pocket Bike Motors

Z

Zomby Builder

Guest
I am looking at a GP 460 motor from www.davesmotors.com The head kits they sell are amazing. With a ported head this motor will get up & Move. I see a lot of you guys running pocket type motors. Has anyone built one with one of these kits yet??


bb88xgp460engine.jpg

cc33xgp42headkitsmall.jpg
 


5

5-7HEAVEN

Guest
:cool:Zomby, my first step was to buy a pocket bike motor on ebay for $99. it had the transmission, which is basically a jackshaft for slight gear reduction. i didn't need the reduction, so i removed it and bolted the engine directly to my STATON friction drive. it shares the same 76mm clutch as my ROBIN 35CC engine, so it should also bolt directly onto my STATON gear chain drive.

be careful which engine you buy from that site. most have the small clutch, some were meant for r/c airplanes, so don't have provisions for a clutch at all.

i believe the pocket bike engines have much greater potential than the chinese happy time engines or the ROBIN/MITSUBISHI/TANAKA/ZENOAH/HONDA rack mounts. high-performance equipment is plentiful. if you can deal with fabbing a radiator system, 15hp is a reality, for a price.
 
S

sunofjustice

Guest
greetings, zomby builder. I recently installed a 47cc pocket bike engine on my schwinn spoiler. I'm looking for a way to upload images this very moment. Originally, I wanted to install a 4 stroke 110cc with a 4 speed but the 30pds of weight coupled to an aluminum frame didnt set well with me.
 
Z

Zomby Builder

Guest
Hop Up

Saw your Schwinn. Very nice. Did you look at DDMotors ported-head kits for those. I have a China 49cc and was wondering if the ported headkit/reed conversion & the big W carb would be as good as buying a new GS460 4.2 hp. The new engine is acually cheaper to buy that these two kits, and comes with the carb.
 
H

Haggard

Guest
I,ve built numerous bikes eith the 49cc cag pocket bike engine. I doubt i'll build another after i use the last of the engines and parts that i already have.
while having less torque than the 70cc bicycle engine, with some porting, jetting , etc. thise things 'll scream up to 14000rpm!!!! but the heads/ pistons take a real beating.
Speaking of options, this is in my opinion, the motor to try . I know i'd sure like to . one day soon i'll get one and let you know. check it out 65cc with 6 speed gearbox, wet clutch pushin over 15 hp
made by morini




::. POWER - TORQUE - CONSUMPTION

ENGINE Two-Stroke Single Cylinder
CYLINDER Light alloy with nickel silicon carbide plated liner with7 scavenge ports plus double exhaust scavenge ports
INTAKE DISTRIBUTION By 4 blade fiber carbon reed valve in engine block
BORE 44,50 mm
STROKE 41,75 mm
DISPLACEMENT 64,93 cc
COMPRESSION RATIO 15,5 +/- 0,5:1
MAX POWER CRANKSHAFT 16,7 Hp (12,3 kW) at 12500 rpm
MAX POWER WHEEL 15,2 Hp (11,2 kW) at 12500 rpm
MAX TORQUE CRANKSHAFT 9,8 Nm at 12000 rpm
MAX RPM 15000 rpm
COOLING Liquid cooled forced circulation by pump
CARBURATOR Dell'Orto PHBL 24 with manual starter by lever
LUBRIFICATION Petrol with + 2% oil mixture sinthetic (Castrol TTS)
IGNITION Electronic magnetic flywheel with internal rotor D 36mm and microprocessor ignition timing management.External ignition coil. Ignition advance 33° +/- 2° a 4000 rpm
STARTER By kick starter (backwards kick)
CLUTCH Multiple disk type in oil bath
TRANSMISSION TYPE 6 speed
PRIMARY TRANSMISSION With helical gears Ratio sprocket/crown Z 21/74 = 3,524
1. speed = 11/40=3,636
2. speed = 15/37=2,466
3. speed = 18/34=1,889
4. speed = 20/30=1,50
5. speed = 23/28=1,217
6. speed = 25/27=1,08
SECONDARY TRANSMISSION By chain ½" x 3/16" roll 8,51mm (chain sprocket Z12 or Z13)
CHAIN ALIGNMENT 86 mm
SPARK PLUG Champion C53 / NGK B105EGV M14x1,25
FUEL EURO unleaded NC 623-02 R.O.N. 95
LUBRIFICATION OIL TYPE CASTROL TTS
OIL TYPE AGIP 2T or CASTROL 2T - TTS
DRY WEIGHT 13,2 kg
OIL CAPACITY TRANSMISSION 0,44 kg tipe SAE 15W/40
 
Last edited by a moderator:
A

andyinchville1

Guest
Wow....somebody PLEASE mount that engine to a bike!!!! ;-O

Andrew
 
5

5-7HEAVEN

Guest
:cool:with a powerful engine and 6-speed trans like that, we are DEFINITELY getting into the realm of motorcycles. be prepared to be pulled over and questioned by the local gendarmes.:eek:

Myron
 
S

sunofjustice

Guest
zomby builder, thank you. I did see the upgrade kit for the "47cc" pocketbike engine! The kit takes the "47cc" (really 43cc) to a cool 49cc......all for only $30. Really wanted to see what the stock piston size could do BEFORE upgrading. This engine I got off of minipocketrockets.com. Stock: 4.4 hp, sy/zh-1 race head, 10,000 rpm. Present mods: Have delorto, 14mm replica carb, manifold, high flow combo( will install later after break in), modifyed stock carb by drilling out and removing fuel shut off key, set jet needle 2nd step from bottom, reamed out jet with MEDIUM sized safety pin (very tedious but works), velocity stack that matches the carb opening ( the first velocity stack sent by mini pocket rockets, DIDNT match!????) , added black magic triple stage reeds, E3 spark plug with .10 gap (sparks looks like an msd when you ground th' plug when pulling!!!), gasket matched (the RIGHT gasket!) and ported th' header exhaust port, upgraded to the high perf clutch with th' HUGE cooling ports and third member support bearing, and finially, since I couldnt find the required 91 octane.........(my license is screwed up, so I have to bike to get gas) I mixed 89 octane(3/4) with 93 octane(1/4). Stock pocketbike engines usually have tame timing unless you add a roket key (timing advance) so it should be alright. Besides, I've tryed mixing different octane mixes for just starting/ idling purposes.....this combo gives decent starting, (sort of) and VERY good performance. Also, I added 20z of B' laster tune up spray, as well as a cap full of ZMAX fuel treatment for a safetynet. G'day! sunofjustice
 
Top