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lemur

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  1. Oset technical service videos can be found here if you can obtain permission to view them all: https://osetbikes.com/au/support-en-AU/electric-tech-videos/ edit: for free versions of the videos search the file names, service videos show throttle to use a hall effect sensor, failure rate for the component used in that assembly is high and the video shows how to test and repair the old unit. ... not something I would recommend unless you have a complete replacement assembly and service the old one later.
  2. From what I've seen of electric bike fails so far they are often related to the the twist grip assembly electronics on the handlebars. Which I would guess to be a rheostat control (variable resistor). I think that is a part I would keep in inventory for replacement after a crash or for trouble-shooting.
  3. Commutator is the rotating copper colour metal surfaces that directly contact the carbon brushes. There must be videos and/or documentation online by now detailing the steps required to test and make adjustments where you can. Meter testing for battery power (voltage) and meter testing the resistance (ohms) through wire circuits and ground wire connections back to the battery will confirm it's not just a damaged wire connection, anything that is sealed in a black box (epoxy) is generally not a user serviceable component unless there are obvious adjustment knobs or screw settings incorporated. Black box assemblies are where you need a second bike or a dealer with access to special test equipment, or known good (new) parts to swap out and ride test. Any exposed electronics can be visually inspected for burns. People with electronic repair experience are more likely to know were to look and what components are most likely to fail with age or heat from over-voltage. Wiring diagrams are always the best place to start, but they will rarely show detailed contents of anything black boxed, for sealed assemblies a second bike to swap out parts to test is unbeatable. That's how a dealer would easy find all the problems, they would use a bike to swap parts until the problem went to the other bike.
  4. more performance oriented cdi implies more ignition timing advance. You can adjust timing at the stator to some extent or even the plug gap to a lesser extent.
  5. Have you done an actual compression test or only based on the kickstart? Ki Is the throttle tube white or black? White is the fast tube, the black throttle tube retards the response slightly. Good chance your bike came with black tube originally like a friends evo factory bikes did.
  6. It's the people who build the sections and tabulate results now that likely know what your regional definition of difficult is. In general terms entry level classes don't need to assault anything taller then the front wheel no need to hop, intermediate classes don't need to hop to negotiate the sections but that ability can be an advantage in sections, intermediate classes should be able to assault a handlebar high obstacle or bigger with control, advanced classes are your top riders consisting of former experts (older) and current experts (younger). Hopefully nobody sets out sections at any level that have not been tested unless you are the guy setting up world round class events, but I think we are all talking about amateur trials club events here.
  7. You need a VOM meter and know how to use it if you own an electric bike. Meter test the voltage going to the motor at full twist and if it does not represent the same voltage as the batteries then it must be curbed by the motor controller, if it reads as full volts to the motor and the motor works but performs poorly, that pretty much has to be the motor brushes doing a poor job of powering the magnets. Adjusting the motor controller to perform at a higher level will make it far more responsive to the point of wheel spin, make adjustments incremental and ride test.
  8. The Oset motors are brush type, the carbon brushes and the commutator that they contact will be the first motor assembly to fail and need service and replacement.
  9. Are you aware they generally put an adjustable potentiometer on the control board so you can curb the performance ?
  10. Link for the event entry is posted here : https://www.ataont.ca/category/events/upcoming-events/
  11. From here it sounds like a very poor fitting piston and rings and I would be concerned with the bottom end seals because of the bikes age and that sound. Compression testing would be a good start followed by inspection of the top end and if you don't find stuck piston rings or serious damage there you might be looking at a major overhaul that requires splitting the cases.
  12. lemur

    TL250 Hot Start

    If it is a non-original carb, how did you set the float level? If the valve clearances are set perfect, I’d be visiting the float level to possibly address the off idle stumble. Carburetors need to be isolated from heat that can boil the fuel and from vibrations that can turn the fuel in the float bowl into froth. Plug read should tell if carb settings are rich or lean, post up a photo of your carb setup and sparkplug after running for a while might help us to assist.
  13. Does the bike currently have a lighting coil installed?
  14. No tail light leaves you required to hand signal stops. 1975 Bultaco Sherpa 250 pretty sure did come with lights unless they were removed at the dealership to race prep. Brochures from the period show them with scooter sized lights and a rubber plate mount on the rear fender, speedo and a horn.
  15. Here's the catch as quoted from the SY250F owner manual: "As the time goes along, the play of the valves changes and it may alter the ratio of air to fuel of the inlet air-fuel mixture. The solution is so to make it adjust by your dealer, as often as written in ‘List of the regular maintenance and lubrications’. It is a really complicated operation, which requires a professional expertise." Twin cam with 5 valves all adjusted by bucket and shims on cams that do not ride on roller bearings is a bad design for trials bikes that might regularly encounter low oil pressure because of slow engine speed operation, low oil pressure is the reason the 4RT engine cam rides on roller bearings and uses roller rockers.
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