tiba_karotsu
OVERREV TUNING
It's pretty hard to get one of these now that scooterracing has taken a backseat to 4strokes (they suck!!) but who cares about them they wouldn't hold a candle next to our race scooters.
it comes with a few jets (38, 40, 42 pilot jet & 135, 138, 140 main jets) but even the 140 isn't big enough for my set-up it was running lean so i had to drill jets for it to work properly.
also the stock needle sucks even at the leanest setting it was still running too rich so i had to transfer my Keihin needle from the OKO to the KOSO & it worked like a charm, now only the pilot jet remains it's still running rich at idle so i'll try decresing it from 40 to 38 but i think a 35 would be perfect i want a crisp, clean throttle response.
you'd think the 70cc would lose power when using a bigger 30mm carb but in this case it's the opposite, the scooters' now very hard to keep the front tire down & even with heavy rollers (25,4 grams total) which are suited for my lightweight rider it's pulling me like i was 45kgs (i weigh 70kgs), i had to retune my MRD manifold to accomodate the bigger carb but it still clears the frame but not too much (on bigger scooters like the Ark or Aerox this won't be a problem).
initial impressions with the big carb are very good i feel i'm going in the right direction in tuning this new engine set-up maybe there's a chance that a 70cc can win some races against 100cc Dio G strokers, until the 2F4R kit arrives i'll be refining this set-up more & make them go nuts about how they can make their scooters faster without blowing them up in 2 runs.
it comes with a few jets (38, 40, 42 pilot jet & 135, 138, 140 main jets) but even the 140 isn't big enough for my set-up it was running lean so i had to drill jets for it to work properly.
also the stock needle sucks even at the leanest setting it was still running too rich so i had to transfer my Keihin needle from the OKO to the KOSO & it worked like a charm, now only the pilot jet remains it's still running rich at idle so i'll try decresing it from 40 to 38 but i think a 35 would be perfect i want a crisp, clean throttle response.
you'd think the 70cc would lose power when using a bigger 30mm carb but in this case it's the opposite, the scooters' now very hard to keep the front tire down & even with heavy rollers (25,4 grams total) which are suited for my lightweight rider it's pulling me like i was 45kgs (i weigh 70kgs), i had to retune my MRD manifold to accomodate the bigger carb but it still clears the frame but not too much (on bigger scooters like the Ark or Aerox this won't be a problem).
initial impressions with the big carb are very good i feel i'm going in the right direction in tuning this new engine set-up maybe there's a chance that a 70cc can win some races against 100cc Dio G strokers, until the 2F4R kit arrives i'll be refining this set-up more & make them go nuts about how they can make their scooters faster without blowing them up in 2 runs.
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