Best CDI box? By robertwav1 (Read 668 times)

[robertwav1]

Hello all,

Kinda new at this stuff but getting aquainted. First, installed a big bore kit on a 49cc scoot and also a superflow carb with I believe a 94 size jet. I have an orange CDI box, coil and wire. My top speed is only around 45mph. Lot's of torque and pull so I'm pretty impressed with the build. What I would like to know if there is a specific CDI box that I could get that would improve top end? Appreciate the feedback. It's a GY6 long case 139qmb with the 100cc big bore kit installed.....Thanks All.

[tvnacman]

is it laboring to crank when starting?



John

[jerryscript]

No, a CDI will not give you more top end (maybe .5 to 1 mph if lucky). Adjusting your CVT roller weights may help, installing a larger variator will help a bit, but the best bet to get higher speed from the power of your BBK is new final drive gears.

[robertwav1]

Well thanks for the response guys. No, it doesn't labor starting up and I did change the weights that came with the kit. Changing the final drive gears, is it something that people do with these things? I see on youtube some of these bikes reaching 65-70....just wondering.

[Alleyoop]

Yes putting in taller gears is something people do IF they want to get more top end out of them. Do not expect the mph you see on you tube those are highly modded motors and trannies. With the biggest BBK and cvt tuning and taller gearing you can expect to reach around real 50mph maybe a little over.

Your 150ccs stock do 50-55 real mph so you can see what more displacement will get you. The 150s motor put out 8-9 hp your 50s 3-4 hp big difference.
Alleyoop

[robertwav1]

Okay, that all makes sense. Just one other question, I noticed they have a A9 performance camshaft available. Is this worth it? It says it will improve performance on a 50cc BBK. What do you guys think about that?

[Alleyoop]

A9 puts out little more RPMS but remember you don't want to be running over 8K if you do your motor will not last. The red line on these Gy6 motors is 8000 rpms then your in the RED ONE you know BOOM

[robertwav1]

Thanks Man, looks like I'll go with the gears then, seems it's the safest way without taxing the engine too much and just a little m ore top end which is what I'm looking for.