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BBK Question
by: geh3333 - Feb 13, 2015 22:04:19 GMT -5
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Post by geh3333 on Feb 13, 2015 22:04:19 GMT -5
There are only so many things u can do for a higher top end . first one can adjust the CVT to be able to hit max horse power on a straight run. For 150's and 50cc's you will want to be able to run near 7500 rpms on such straight roads. For more speed at top end you will want to increase the bore and increase the airflow through the engine , from air filter through to exhaust. To be able to use this new found power for top end speed upyou will need to re gear the final drive gears . and for optimal performance and more horse power a bigger carb will give you your finishing touch . just like the video alley posted about the bigger carb making the engine scream. All of these mods will set u back in $ but will give you a top end u will be satisfied with .
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Post by JerryScript on Feb 14, 2015 3:14:10 GMT -5
That video showed that the largest carb tried was too much, a 30, the smaller carb is what gave the snappy response we all want.
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BBK Question
by: geh3333 - Feb 14, 2015 23:31:17 GMT -5
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Post by geh3333 on Feb 14, 2015 23:31:17 GMT -5
That video showed that the largest carb tried was too much, a 30, the smaller carb is what gave the snappy response we all want. Yes , but he used a 28mm carb , which is one of the sizes I think should be used besides the stock 24mm . also the 30mm could have been easily modded to give the snappier throttle response . I cut a little off the diaphragm plunger spring which allows the needle to rise a little easier and quicker , and with a pumper carb this helps out even more. |
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Post by rcq92130 on Feb 15, 2015 0:24:28 GMT -5
Instead of cutting the spring just use the proper main jet to account for the lower vacuum at the venturi. proper mixture PLUS less restricted airflow.
I have a pumper carb (30mm) and so cannot comment on what it would be like w/o the pumper.
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BBK Question
by: geh3333 - Feb 15, 2015 19:52:51 GMT -5
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Post by geh3333 on Feb 15, 2015 19:52:51 GMT -5
Instead of cutting the spring just use the proper main jet to account for the lower vacuum at the venturi. proper mixture PLUS less restricted airflow. I have a pumper carb (30mm) and so cannot comment on what it would be like w/o the pumper. Problem is I was already at the right mixture. I saw a video of someone modding their carb " I think jersey posted it awhile back " it was for a Harley . I didn't have a problem with throttle response , however I decided to give it a shot and see what happened. It did give the carb an extra kick with response. It was like a bonus , lol |
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Post by rcq92130 on Feb 15, 2015 20:16:26 GMT -5
Wow. So is your top end up to 63 mph yet? Exciting!!!!
Question: I have oodles of off-the-line acceleration but not much top end. That's probably mostly because of the huge, fully upright windshield. Drag is a function of frontal area times velocity SQUARED, so after 40 mph mostly the engine is fighting drag. And with my barn door windshield the engine is pretty helpless above 60 or so.
Still, might make sense to trade off some low end for top end via gears. Do these just drop in or is it necessary to have anything pressed on?
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BBK Question
by: geh3333 - Feb 15, 2015 21:43:30 GMT -5
via mobile
Post by geh3333 on Feb 15, 2015 21:43:30 GMT -5
Wow. So is your top end up to 63 mph yet? Exciting!!!! Question: I have oodles of off-the-line acceleration but not much top end. That's probably mostly because of the huge, fully upright windshield. Drag is a function of frontal area times velocity SQUARED, so after 40 mph mostly the engine is fighting drag. And with my barn door windshield the engine is pretty helpless above 60 or so. Still, might make sense to trade off some low end for top end via gears. Do these just drop in or is it necessary to have anything pressed on? Do u still have stock gears ? |
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Post by rcq92130 on Feb 15, 2015 21:48:01 GMT -5
Yep. Everything attached to the rear wheel is stock
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Post by rcq92130 on Feb 15, 2015 21:50:17 GMT -5
So at any given engine condition (airflow and engine vacuum) cutting the spring allows the piston to be higher by, essentially, making the spring a litlle less strong.
The only thing this effects - I think - is the needle rises higher out of the jet. Since the needle is tapered this means there is more clearance between the needle and the jet - resulting in more fuel mixed into the air.
Isn't this just the same as upjetting?
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BBK Question
by: geh3333 - Feb 15, 2015 21:52:27 GMT -5
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Post by geh3333 on Feb 15, 2015 21:52:27 GMT -5
Yep. Everything attached to the rear wheel is stock Most go 2 up and 2 down from 13:40 to 15:38. I accidentally bought 14:38 but have been great. |
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Post by rcq92130 on Feb 15, 2015 22:11:12 GMT -5
so --- anything that needs to be pressed on, or simply open, remove, drop in, button up?
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BBK Question
by: geh3333 - Feb 15, 2015 23:21:52 GMT -5
via mobile
Post by geh3333 on Feb 15, 2015 23:21:52 GMT -5
so --- anything that needs to be pressed on, or simply open, remove, drop in, button up? Sorry ,lol . u can by the gears already pressed or you can have it done yourself. You can remove all the gears by hand " no gears are pressed into the gearbox " two are pressed together then installed back into the gearbox. |
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