Roller weights

[james24]

Can anyone tell me which roller weights to use for power and hill climbing for taotao scooter? Thanks jpm

[GrumpyUnk]

Higher weight will make the upshift sooner, lighter will delay the shift to higher ratios. For climbing hills, I would think delayed shift would make the climb better as the engine has a better ratio for the added work to be done. You might find the top speed is reduced as the force generated may not push the ratios as far as a heavier roller.
tom

[aeroxbud]

This is sort a read. www.pedparts.co.uk/blog/moped-tuning--rollers

[GrumpyUnk]

Apr 8, 2024 14:46:10 GMT -5 aeroxbud said:

This is sort a read. www.pedparts.co.uk/blog/moped-tuning--rollers

 The graphed results actually indicate what I have suspected about 'top speed'.  Once the variator has contracted the effective width of the pulley, the other pulley, under spring pressure, should reach its maximum effective diameter, and thus the max gear ratio to achieve max speed.  IF the engine can produce enough power to make things move to their fullest.  My take is that most can eventually get there.
 The graphs are very interesting with the heavier rollers keeping the engine from reaching its peak hp producing rpm, and thus slowing acceleration achieved until the get 'on their cam' or for 2T, on their peak where the exhaust extracts maximum because of harmonics and in turn pulls the max charge in. (their 'cam').
 It never made sense that lighter rollers could not bring the variator to its max ratio, though it seems they would take more time.
 I have one machine that has a tach temporarily on the handlebar.  It seems to turn off regularly, and need reset.(cheap)  When it does, and I am going downhill, it seems to fail at the 9999 rpm indication.  I wondered what good would a BBK do if it was limited by rpms anyway, or the rpms achieved would cause the little boogar to explode...  Apparently thinking it would be a waste of time as it was rpm limited anyway.  Now, I do not know.  Maybe the tach is real junk, or it needs a new battery(wire wrapped around the spark plug wire is the only connection).  Or it actually does reach 10k rpm.
 I may still do a BBK as I have a few sitting around.
tom