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Post by lain on Feb 11, 2015 17:32:45 GMT -5
I never noticed a performance drop while using the BBK from scorpion products (the ebay seller you mentioned). I am running a brand new install now though, getting great performance, leaving cars behind at stop lights and they stay behind cuz of good speeds.
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Post by spudsmckinsey on Feb 11, 2015 18:32:31 GMT -5
Thanks again everyone.
Does anyone think the standard 49cc CDI might be affecting my top end?
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Post by spudsmckinsey on Feb 11, 2015 18:33:28 GMT -5
I never noticed a performance drop while using the BBK from scorpion products (the ebay seller you mentioned). I am running a brand new install now though, getting great performance, leaving cars behind at stop lights and they stay behind cuz of good speeds. What mods did you do other than the bigger piston? Cam? Big Bore Head? |
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Post by JerryScript on Feb 11, 2015 19:42:13 GMT -5
Those 8 gram weights are the culprit I'm betting on. Try going down to 6 gram (I prefer sliders).
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Post by lain on Feb 11, 2015 21:51:34 GMT -5
I would also say check the weights actually. Now that I remember when I installed my new BBK I still had the weights from the previous BBK in my variator. It felt like it was vibrating more which was what made me check them. One of the weights was worn down on one side real bad. I replaced them with new 8g weights and that vibration went away and it was better. I am thinking we need higher quality weights than what comes with the kit. I have some sliders and stuff I have in storage I haven't checked out yet, but they worked well on my previous setup.
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Post by spudsmckinsey on Feb 11, 2015 23:25:28 GMT -5
Those 8 gram weights are the culprit I'm betting on. Try going down to 6 gram (I prefer sliders). Ok. When I got it, it had 10gram rollers. The 8 gram rollers I installed came with the BBK from 02Starrider. I'll order some 6 gram weights and try that. I thought heavier weights would tend to push the variator closed earlier, forcing the belt to have a larger radius up front making the scooter change to top end gearing earlier? Won't lighter weights cause it to stay in "lower gear" longer? Truth be told, my engine doesn't sound right to me. It seems to be limited. At higher RPM's it sounds choppy and rough like it's just not developing clean power. It may be that this motor is just not healthy. It may have too much power robbing vibration caused by main bearing wear and it's being aggravated by the 83cc piston. Just speculating. I'm also gonna try a different CDI and coil. I really need a tach. I don't think it's getting above about 6000 rpm. The other thing I need to do really badly is start the motor with the cover off and watch the belts as I rev it. |
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Post by lain on Feb 11, 2015 23:33:26 GMT -5
Have you readjusted the valves since you installed it? After a month or so my valves tightened up after install.
How does the spark plug look? You can tell if the engine is running funny by the spark plug in a lot of cases.
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Post by spudsmckinsey on Feb 11, 2015 23:36:23 GMT -5
Hello,
It has about 100 miles on it now. I haven't rechecked the valves yet.
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Post by rcq92130 on Feb 16, 2015 15:37:15 GMT -5
Sorry, Spuds! Sometimes I am a dense monkey!
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Post by geh3333 on Feb 16, 2015 17:44:52 GMT -5
Those 8 gram weights are the culprit I'm betting on. Try going down to 6 gram (I prefer sliders). Ok. When I got it, it had 10gram rollers. The 8 gram rollers I installed came with the BBK from 02Starrider. I'll order some 6 gram weights and try that. I thought heavier weights would tend to push the variator closed earlier, forcing the belt to have a larger radius up front making the scooter change to top end gearing earlier? Won't lighter weights cause it to stay in "lower gear" longer? Truth be told, my engine doesn't sound right to me. It seems to be limited. At higher RPM's it sounds choppy and rough like it's just not developing clean power. It may be that this motor is just not healthy. It may have too much power robbing vibration caused by main bearing wear and it's being aggravated by the 83cc piston. Just speculating. I'm also gonna try a different CDI and coil. I really need a tach. I don't think it's getting above about 6000 rpm. The other thing I need to do really badly is start the motor with the cover off and watch the belts as I rev it. You should still get top climb on the variator , just at a higher rpm . and now that u will be able to reach a higher rpm you will have an increase in power. You will notice better takeoff and you will also reach the same top end if not a higher top end |
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Post by phatboy on Feb 19, 2015 18:56:32 GMT -5
I used to have a 49cc with BBK, did not make a lot of difference at first, but what really opened up the engine was an A9 cam, was only around $30 and think I bought from that same seller. I played with jets, air filters and I dropped down to 5g rollers which took advantage of the higher power band on the cam, took months to get a good tune on that scoot. Ultimately it was just not quite enough power so I went 150cc.
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Post by xyshannen on Feb 21, 2015 13:48:57 GMT -5
I used to have a 49cc with BBK, did not make a lot of difference at first, but what really opened up the engine was an A9 cam, was only around $30 and think I bought from that same seller. I played with jets, air filters and I dropped down to 5g rollers which took advantage of the higher power band on the cam, took months to get a good tune on that scoot. Ultimately it was just not quite enough power so I went 150cc.yup, there's no replacement for displacement. |
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