CompoSimmonite
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I want to restrict the top speed of my Yamaha quad bike to 8 mph. It is CVT gearbox and CDi ignition with carb.
The reason - it's weight and width are within the legal requirements for a mobility buggy
I'm disabled and although I already have a gently off road capable electric buggy (properly registered with DVLA and taxed !) I now want a petrol powered that I can tackle more out of the way places.
Last year I managed to get a rear engined lawn mower registered as a mobility scooter but it needs too much adaptation hence this time easier to modifiy a quad I already own.
Accepted I will have to add lights, hazard, indicators and horn but not difficult as I already have the parts / switchgear and quad has alternator / battery.
Problem however is the speed requirement. For pavement use limit is 4 mph and road use 8mph. I don't want to simply alter drive chain sprockets as the engine would then be screaming at 8mph. With the CVT gearbox I want full power when in low ratio and power reducing in correspondance to speed.
I've tried to see how it's done on HGV's but that involves too complicated.
I assume a road speed sensor with an ECU or similar that alters ignition timing is what's needed. What about altering roller weights and movement of pulleys in CVT gearbox ?
Any suggestions, ideas, imput etc - all welcome.
Thanks.
Paul H.
The reason - it's weight and width are within the legal requirements for a mobility buggy
I'm disabled and although I already have a gently off road capable electric buggy (properly registered with DVLA and taxed !) I now want a petrol powered that I can tackle more out of the way places.
Last year I managed to get a rear engined lawn mower registered as a mobility scooter but it needs too much adaptation hence this time easier to modifiy a quad I already own.
Accepted I will have to add lights, hazard, indicators and horn but not difficult as I already have the parts / switchgear and quad has alternator / battery.
Problem however is the speed requirement. For pavement use limit is 4 mph and road use 8mph. I don't want to simply alter drive chain sprockets as the engine would then be screaming at 8mph. With the CVT gearbox I want full power when in low ratio and power reducing in correspondance to speed.
I've tried to see how it's done on HGV's but that involves too complicated.
I assume a road speed sensor with an ECU or similar that alters ignition timing is what's needed. What about altering roller weights and movement of pulleys in CVT gearbox ?
Any suggestions, ideas, imput etc - all welcome.
Thanks.
Paul H.