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Post by devinchasteen15 on Apr 23, 2015 13:05:50 GMT -5
Yesterday I installed an 80cc bbk onto my scooter. After I was done it was a little hard to start with electric start but it did start and rode awesome. Rode it around for a lil bit varying throttle positions and letting it slow its self down then I parked it and this morning it wouldent start. It turns over faster with throttle all the way closed but if I open the throttle at all it turns over slower. Could I have just drained the battery and its to low to start it now?
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Post by lain on Apr 23, 2015 13:54:08 GMT -5
Yesterday I installed an 80cc bbk onto my scooter. After I was done it was a little hard to start with electric start but it did start and rode awesome. Rode it around for a lil bit varying throttle positions and letting it slow its self down then I parked it and this morning it wouldent start. It turns over faster with throttle all the way closed but if I open the throttle at all it turns over slower. Could I have just drained the battery and its to low to start it now? That's normal. When you upgrade the engine you should also upgrade the starter or make sure the one you have will have enough torque to push it over. I have a "100cc" BBK and had the same exact issue when I first installed. It turned out that my starter was already so used that it no longer had the power to push the new engine over, however still had the power to push a 50cc over easily. I replaced it with a stock starter and replaced all the starter wires and it turns over great now. Did you use bigger valve gaps than with the 50cc you had? Most 50cc gy6 engines run at both gapped at 0.003 or 0.004 or in0.003 and out0.004. With the engine upgrade you should be using slightly larger gaps, like both 0.004 or 0.005 or in0.004 and out 0.005, however results may vary and you may find better performance out of larger gaps, but do not go too large or too small or damage will occur. |
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Post by devinchasteen15 on Apr 23, 2015 14:04:38 GMT -5
Yesterday I installed an 80cc bbk onto my scooter. After I was done it was a little hard to start with electric start but it did start and rode awesome. Rode it around for a lil bit varying throttle positions and letting it slow its self down then I parked it and this morning it wouldent start. It turns over faster with throttle all the way closed but if I open the throttle at all it turns over slower. Could I have just drained the battery and its to low to start it now? That's normal. When you upgrade the engine you should also upgrade the starter or make sure the one you have will have enough torque to push it over. I have a "100cc" BBK and had the same exact issue when I first installed. It turned out that my starter was already so used that it no longer had the power to push the new engine over, however still had the power to push a 50cc over easily. I replaced it with a stock starter and replaced all the starter wires and it turns over great now. Did you use bigger valve gaps than with the 50cc you had? Most 50cc gy6 engines run at both gapped at 0.003 or 0.004 or in0.003 and out0.004. With the engine upgrade you should be using slightly larger gaps, like both 0.004 or 0.005 or in0.004 and out 0.005, however results may vary and you may find better performance out of larger gaps, but do not go too large or too small or damage will occur. OK thanks so much!!! I was thinking something horrible happened. I will try the bigger gaps when I get back home and charge my battery. What size wires you recommend? |
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Post by lain on Apr 23, 2015 14:23:25 GMT -5
That's normal. When you upgrade the engine you should also upgrade the starter or make sure the one you have will have enough torque to push it over. I have a "100cc" BBK and had the same exact issue when I first installed. It turned out that my starter was already so used that it no longer had the power to push the new engine over, however still had the power to push a 50cc over easily. I replaced it with a stock starter and replaced all the starter wires and it turns over great now. Did you use bigger valve gaps than with the 50cc you had? Most 50cc gy6 engines run at both gapped at 0.003 or 0.004 or in0.003 and out0.004. With the engine upgrade you should be using slightly larger gaps, like both 0.004 or 0.005 or in0.004 and out 0.005, however results may vary and you may find better performance out of larger gaps, but do not go too large or too small or damage will occur. OK thanks so much!!! I was thinking something horrible happened. I will try the bigger gaps when I get back home and charge my battery. What size wires you recommend? I am using 12 gauge for the wire to the solenoid from the battery, from the solenoid to the starter, and the starter to ground (frame) all without issue. |
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Post by devinchasteen15 on Apr 23, 2015 15:10:29 GMT -5
OK thanks so much!!! I was thinking something horrible happened. I will try the bigger gaps when I get back home and charge my battery. What size wires you recommend? I am using 12 gauge for the wire to the solenoid from the battery, from the solenoid to the starter, and the starter to ground (frame) all without issue. Hopefully I can do this soon. Thanks lain!! |
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Post by lain on Apr 23, 2015 16:54:27 GMT -5
It's fairly easy to do. You will also want to invest in some terminal ends and a crimper/stripper/cutter tool. Make the ends of those wires look professional and last long! If you just tie the wires around the solenoid posts and everything they are likely to come undone by vibration. Also make sure to cover the solenoid terminals after everything so moisture does not get in and bridge the gap and start ur engine when your asleep haha (rare but possible and also a hazard). I just tie my solenoid up with electrical tape, works great, looks like crap, but no one is looking at the solenoid but you hopefully. You can also just use the old rubber caps, but in my case I did not even have any haha.
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80cc bbk help
by: JerryScript - Apr 24, 2015 0:15:18 GMT -5
via mobile
Post by JerryScript on Apr 24, 2015 0:15:18 GMT -5
If it is turning over ok, it's not the starter motor necessarily. Did you up jet your carb? Sounds like it's starving for fuel. It almost starts because it almost has enough fuel, opening the throttle at low RPM opens the butterfly allowing more air in, and starving it.
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Post by devinchasteen15 on Apr 24, 2015 6:46:32 GMT -5
If it is turning over ok, it's not the starter motor necessarily. Did you up jet your carb? Sounds like it's starving for fuel. It almost starts because it almost has enough fuel, opening the throttle at low RPM opens the butterfly allowing more air in, and starving it. Put a 96 MJ in is that a good size or so I need bigger? Also after I charged the battery it started after a few seconds of cranking. It starts faster with the stock cdi Idk why. |
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Post by lain on Apr 24, 2015 9:34:21 GMT -5
Stock CDI works better in the low end, if you are looking for a performance CDI for your BBK forget about the blue and orange CDIs, just throw them out a window they have nothing compared to a Casoli CDI. Get one, you'll see a big difference in performance and it'll start and idle better. It won't solve an issue, but it will improve performance by a bunch and some.
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Post by devinchasteen15 on Apr 24, 2015 9:36:19 GMT -5
Stock CDI works better in the low end, if you are looking for a performance CDI for your BBK forget about the blue and orange CDIs, just throw them out a window they have nothing compared to a Casoli CDI. Get one, you'll see a big difference in performance and it'll start and idle better. It won't solve an issue, but it will improve performance by a bunch and some. OK I'll have to get one then |
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Post by lain on Apr 24, 2015 9:39:30 GMT -5
You have high compression with the BBK now. A racing or performance CDI that is not a casoli will cause hard starting usually with the higher compression due to the fixed advanced spark timing. The blue and orange ones work great with stock 50cc, but add more pressure and it will do a lot of kickbacks and misfires at starting. It will try to spark the fuel before you even have the piston up at the top when you are starting.
I had the same issue you are having but with a stock CDI due to high compression. I ended up getting a thicker head gasket and it solved the problem. Even with my new starter and wires it would not push it over fast until I got the thick head gasket. Once it did push over though it ran great, just getting it to start was an effort and sometimes left me with a dead battery though that was during winter when starting meant giving so much extra power because it was like 10-20 degrees.
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80cc bbk help
by: JerryScript - Apr 24, 2015 9:41:25 GMT -5
via mobile
Post by JerryScript on Apr 24, 2015 9:41:25 GMT -5
96 May be too big. That size is normally used on a 100cc BBK,  is usually enough for a 80cc BBK. |
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Post by devinchasteen15 on Apr 24, 2015 10:16:31 GMT -5
96 May be too big. That size is normally used on a 100cc BBK, is usually enough for a 80cc BBK. Oh alright I'll change it when I get home |
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Post by lain on Apr 24, 2015 10:27:59 GMT -5
Yeah I used on my 100cc bbk before I upgraded the air intake. I was using a cone filter that only pulls in about 25% more than an air box. The uni foam filters draw in a lot more air though, I am using  now on my 100cc. I actually have an extra jet I never used if you need it, I can ship it to you if you pay the shipping. |
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Post by devinchasteen15 on Apr 24, 2015 10:45:18 GMT -5
Yeah I used on my 100cc bbk before I upgraded the air intake. I was using a cone filter that only pulls in about 25% more than an air box. The uni foam filters draw in a lot more air though, I am using now on my 100cc. I actually have an extra jet I never used if you need it, I can ship it to you if you pay the shipping. I have one. Thanks for offering tho. |
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is usually enough for a 80cc BBK.
now on my 100cc.