High Compression (180psi!) but Low Power on Stock Grubee Kit

Discussion in 'Motorized Bicycle General Discussion' started by Eagle420, Feb 10, 2019.

  1. Eagle420

    Eagle420 New Member

    Feb 10, 2019
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    Well, I got a new (3rd) CDI, as well as a coil in the mail, from a China / Ebay seller today. My old stock coil, and the newish CDI I got from gasbikes . net seems to be working well enough for now. I will ride the heck outta those, and replace with this newer "TZ" style electronics set that I received today, when the time comes.

    I also got my dinky chrome banana pipe in the mail from China / Ebay today (different seller, I believe). Replaced my stripped exhaust port bolt, slapped on a new gasket and this new muffler with a generic-tuned expansion chamber, and HOLY CRAP, WHAT A DIFFERENCE.

    I was having to use full choke to get her goin in colder weather here, and now I cannot get it started with full choke - still too rich I guess, on leanest setting, with stock carb and jet.

    Got it goin no problem with zero choke, and WOW does it EVER have a LOT of power now! It is NOT a QUANTIFIED value, but it SEEMS to be TWICE as powerful now! Nearly as loud as stock exhaust with a giant hile drilled in, to bypass my clogged catalytic converter (maybe louder?) but absolutely worth it. I only ever use about 25% throttle to cruise, and MAYBE 50% going up a steep hill, so it SHOULD be okay on my short (3km) nightly (11pm) journeys home.

    Feels like I got enough power now to tear my rear wheel right off if I am not careful lol :)

    Still need to do a PSI test with WOT when the engine is warmed up / hot, but overall this dinky bike is running GREAT now... Now I just need to upgrade from these OLD-style C brakes o_O
  2. Greg58

    Greg58 Well-Known Member

    May 1, 2011
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    Don't worry too much about the compression, if its running good I don't see a problem. As for brake pads you can try different compounds, bmx style are made of better material, I tried a couple to find the pads that work better for me. Pads will wear fast now so keep extras.

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