5
5-7HEAVEN
Guest
We are all blessed with many engines to choose from, in motorizing our bicycles. The more common ones are the 48cc-80cc Chinese engines, rack-mounted HONDAS/MITSUBISHIS/ROBINS/TANAKAS and a sprinkling of pocket bike engines.
I have two of each kind.
I'm wondering how many members are modifying their engines for more power and performance, in true hottrodding style. If so, let's hear your testimonials.
I'm digging into my $100 pocket bike engine with great vigor. First, I installed an advance crank key, which easily slipped onto the crankshaft. Next, I installed a DELLORTO 14/14/replica carb.
http://www.davesmotors.com/store/product871.html
I was disappointed that I had to remove the reed induction system to facilitate the carb installation.
A few days later, I found a high-performance reed system made specifically for DELLORTO carb on pocket bike engine.
http://www.davesmotors.com/store/product172.html
It bolted on easily, and I'm happy again.
I discovered that a tuned pipe would greatly enhance the pocket bike engine's power and speed. This is especially so if I were to use a brand name and model expansion chamber that had been proven on national racing tracks. For obvious reasons, I would not be able to use a lengthy tuned pipe made specifically for a pocket bike.
Since pb engines are very similar to goped engines, I reasoned that I'd be able to find a goped tuned pipe to fit my engine and bicycle.
I found Davesdiscountmotors.com online, and realized they had a LOT of goped and pocket bike performance equipment. First, I bought a "TERMINATOR X-CAN" made specifically for pb engines.
http:www.davesmotors.com/store/product1210.html
It's the size of a pack of cigarettes, and offered some performance gain. I bought one, and it would NOT bolt onto the exhaust flange, due to incorrect bolt spacing. Darn.
Next I carefully measured the exhaust port and bolt spacing. I also read and re-read the online catalog, painstakingly looking for cross-references between pocket bike engines and goped engines. I found out that the ZENOAH G62 goped engine shared similar exhaust port size and bolt spacing as my pb engine. So I bought a SIKK flange for a pb engine and an ADA billet flange for the G62 engine. Even though the SIKK was specifically made for the pb engine, its narrow flange restricted the engine's exhaust port by over 40%. Thankfully, the ADA billet flange matched the pb's port perfectly, and just needed the bolt holes enlarged to accept larger exhaust bolts.
After much time doing "spatial visualization"(like fitting upside-down puzzle parts) between available tuned pipes for goped engines and my pb engine, I WAS going to order the G62 tuned pipe. HOWEVER, since the G62 is a 62cc engine and my pb engine has 49cc, I ordered an ADA pipe that was catalogued for a 40-something cc engine.
http:www.davesmotors.com/store/product212.html
I reasoned that my ADA billet flange SHOULD match any ADA tuned pipe.
All my guesswork paid off. The G62 billet flange for the 62cc engine bolts onto my pb engine's perfectly. The 40-something cc engine's ADA tuned pipe slips perfectly into the ADA billet flange. The semicircular expansion chamber clears all obstacles, such as engine, STATON friction drive and tire. It is a very good fit, and I expect excellent midrange-top end acceleration.
IF the engine blows up, I'll rebuild, install an oversize cylinder kit and balance everything.
Let's hear about your engine mods!
Myron
I have two of each kind.
I'm wondering how many members are modifying their engines for more power and performance, in true hottrodding style. If so, let's hear your testimonials.
I'm digging into my $100 pocket bike engine with great vigor. First, I installed an advance crank key, which easily slipped onto the crankshaft. Next, I installed a DELLORTO 14/14/replica carb.
http://www.davesmotors.com/store/product871.html
I was disappointed that I had to remove the reed induction system to facilitate the carb installation.
A few days later, I found a high-performance reed system made specifically for DELLORTO carb on pocket bike engine.
http://www.davesmotors.com/store/product172.html
It bolted on easily, and I'm happy again.
I discovered that a tuned pipe would greatly enhance the pocket bike engine's power and speed. This is especially so if I were to use a brand name and model expansion chamber that had been proven on national racing tracks. For obvious reasons, I would not be able to use a lengthy tuned pipe made specifically for a pocket bike.
Since pb engines are very similar to goped engines, I reasoned that I'd be able to find a goped tuned pipe to fit my engine and bicycle.
I found Davesdiscountmotors.com online, and realized they had a LOT of goped and pocket bike performance equipment. First, I bought a "TERMINATOR X-CAN" made specifically for pb engines.
http:www.davesmotors.com/store/product1210.html
It's the size of a pack of cigarettes, and offered some performance gain. I bought one, and it would NOT bolt onto the exhaust flange, due to incorrect bolt spacing. Darn.
Next I carefully measured the exhaust port and bolt spacing. I also read and re-read the online catalog, painstakingly looking for cross-references between pocket bike engines and goped engines. I found out that the ZENOAH G62 goped engine shared similar exhaust port size and bolt spacing as my pb engine. So I bought a SIKK flange for a pb engine and an ADA billet flange for the G62 engine. Even though the SIKK was specifically made for the pb engine, its narrow flange restricted the engine's exhaust port by over 40%. Thankfully, the ADA billet flange matched the pb's port perfectly, and just needed the bolt holes enlarged to accept larger exhaust bolts.
After much time doing "spatial visualization"(like fitting upside-down puzzle parts) between available tuned pipes for goped engines and my pb engine, I WAS going to order the G62 tuned pipe. HOWEVER, since the G62 is a 62cc engine and my pb engine has 49cc, I ordered an ADA pipe that was catalogued for a 40-something cc engine.
http:www.davesmotors.com/store/product212.html
I reasoned that my ADA billet flange SHOULD match any ADA tuned pipe.
All my guesswork paid off. The G62 billet flange for the 62cc engine bolts onto my pb engine's perfectly. The 40-something cc engine's ADA tuned pipe slips perfectly into the ADA billet flange. The semicircular expansion chamber clears all obstacles, such as engine, STATON friction drive and tire. It is a very good fit, and I expect excellent midrange-top end acceleration.
IF the engine blows up, I'll rebuild, install an oversize cylinder kit and balance everything.
Let's hear about your engine mods!
Myron
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