Skyliner70cc
Active Member
- Local time
- 4:58 PM
- Joined
- Nov 17, 2007
- Messages
- 1,338
I've built many motorized bikes over the past 4+ years. I finally got one that is almost perfect and a keeper. I've taken it for several long rides today (without a tool box) and I have been very impressed by its performance which is getting better wtih each ride.
Here's what I'm riding:
Schwinn Searcher with 7 speed Mega gear (new Searchers don't have the 34 tooth megagear)
SBP Shifter kit: It works flawlessly on this bike. I desperately need a custom fabricated chain guard to mount on the centrifugal clutch cover assembly.
BGF 66cc engine with dual start (pedal and pull) and centrifugal clutch.
a. This stock engine had assembly defect which caused centrifugal clutch to quit working early after install. Easily fixed with replacement parts.
b. Stock headgasket is 3times thicker than usual headgasket on other HT engines and other BGF engines I've purchased. Very easy to pull and pedal start with this stock head gasket.
High compression slant head: OMG, wtih thinner head gasket, compression makes it very difficult to pedal and pull start. Once it starts running, it is a brute that alows me to cruise effortlessly at speeds nearly exceeding my comfort level. Some issues:
a. Extra power meaks it uses more fuel. The air/fuel mixture is no longer rich as it was before with stock head/stock head gasket. If you are at sea level, be careful as you may be running too lean. Here at 1+ miles altitude, it appears to be running juts right.
b. 85 octane with 5oz oil/gallon ain't cutting it. I noticed some very light pinging (detonation/preignition) occuring at full throttle going up a steep hill. Backing off throttle fixed the issue. I'll try 87 octane to see if this problem is remedied and possibly a cooler spark plug. I'm breaking my own rules and running the stock spark plug.
Issues:
&*()*&^%^&* exhaust gasket leak. I'm on second gasket and it still leaks oil all over the place. Any advice? Will check to see if the exhaust flange is perfectly level/flat.
Clutch lever (manual clutch lever) broke on 2nd ride. Poor qualiy metal, replacement is holding up. I disengage the manual clutch on starts, for engine warmup, and for extended idling.
Stock SBP shifter chain guard doesn't work. Need to ride with my right leg forard the entire time. Accidently got pants caught in sprocket on a previous ride when I didn't do this.
Stock pull start rope is worthless and WILL fail on 3-4th pull
Go to Home Despot and buy a replacement cord. It works perfectly and is very durable. Be careful, if you are using a high compression head, you may bust your nuckles on the gas tank ridge when pull starting a cold engine.
Pedal start is almost impossible on a cold engine. Difficult but manageable once engine is warmed up.
Future upgrades:
It needs a SBP tuned pipe. While the power is more than adequate and I can climb any hill at my altitude from a dead stop without pedalling, I need a tuned pipe to provide the same performance at higher altitudes when I ride in the mountains.
Speedometer
Bike rack
Horn
Helmet for rider/ can't find my old one due to recent move.
Thicker slime tubes and kevlar tires
Here's what I'm riding:
Schwinn Searcher with 7 speed Mega gear (new Searchers don't have the 34 tooth megagear)
SBP Shifter kit: It works flawlessly on this bike. I desperately need a custom fabricated chain guard to mount on the centrifugal clutch cover assembly.
BGF 66cc engine with dual start (pedal and pull) and centrifugal clutch.
a. This stock engine had assembly defect which caused centrifugal clutch to quit working early after install. Easily fixed with replacement parts.
b. Stock headgasket is 3times thicker than usual headgasket on other HT engines and other BGF engines I've purchased. Very easy to pull and pedal start with this stock head gasket.
High compression slant head: OMG, wtih thinner head gasket, compression makes it very difficult to pedal and pull start. Once it starts running, it is a brute that alows me to cruise effortlessly at speeds nearly exceeding my comfort level. Some issues:
a. Extra power meaks it uses more fuel. The air/fuel mixture is no longer rich as it was before with stock head/stock head gasket. If you are at sea level, be careful as you may be running too lean. Here at 1+ miles altitude, it appears to be running juts right.
b. 85 octane with 5oz oil/gallon ain't cutting it. I noticed some very light pinging (detonation/preignition) occuring at full throttle going up a steep hill. Backing off throttle fixed the issue. I'll try 87 octane to see if this problem is remedied and possibly a cooler spark plug. I'm breaking my own rules and running the stock spark plug.
Issues:
&*()*&^%^&* exhaust gasket leak. I'm on second gasket and it still leaks oil all over the place. Any advice? Will check to see if the exhaust flange is perfectly level/flat.
Clutch lever (manual clutch lever) broke on 2nd ride. Poor qualiy metal, replacement is holding up. I disengage the manual clutch on starts, for engine warmup, and for extended idling.
Stock SBP shifter chain guard doesn't work. Need to ride with my right leg forard the entire time. Accidently got pants caught in sprocket on a previous ride when I didn't do this.
Stock pull start rope is worthless and WILL fail on 3-4th pull
Go to Home Despot and buy a replacement cord. It works perfectly and is very durable. Be careful, if you are using a high compression head, you may bust your nuckles on the gas tank ridge when pull starting a cold engine.Pedal start is almost impossible on a cold engine. Difficult but manageable once engine is warmed up.
Future upgrades:
It needs a SBP tuned pipe. While the power is more than adequate and I can climb any hill at my altitude from a dead stop without pedalling, I need a tuned pipe to provide the same performance at higher altitudes when I ride in the mountains.
Speedometer
Bike rack
Horn
Helmet for rider/ can't find my old one due to recent move.
Thicker slime tubes and kevlar tires
