fastandyc Posted October 20, 2008 Author Report Share Posted October 20, 2008 slipped again? how long to you guys lap the wheel on for 5 mins 6 hours? i also tightened it with an impact gun! Quote Link to comment Share on other sites More sharing options...
fastandyc Posted October 20, 2008 Author Report Share Posted October 20, 2008 well how doi know when ive got it prepped correctly with the lapping? i mean if i lap it for 10 mins,am i looking for a really smooth shiny surface? Quote Link to comment Share on other sites More sharing options...
fastandyc Posted October 21, 2008 Author Report Share Posted October 21, 2008 Hi fastandyc,You'll need another new woodruff key. The crank nut must have a lock washer between it and the flywheel otherwise the engine vibes will shake the nut loose. The key is only there to locate the flywheel in the correct position and the locking action is fully dependant on the connection between the two (almost) matching tapers. The nut must be tight. If you haven't made up a strong flywheel holding tool (a steel flat bar with two accurately placed spigots that locate in the flywheel holes) then you can use a ring spanner on the nut, holding it into the flywheel with the left hand while at the same time holding your hand around the flywheel then belt the spanner with a heavy leather faced hammer - this was standard practice with the old Villiers motors - they even supplied a "Hammer tight Spanner". I still use this method. Can be frowned upon by purists who advise that the crankshaft can twist, maybe so but in over 30 years this has never happened. Bye, PeterB. when u say the crank must have a lockwasher between the flywheel and crank? do u just mean the washer that sits under the nut that you torque to hold the flywheel on? i take it theres not supposed to be a washer behind the flywheel? Quote Link to comment Share on other sites More sharing options...
peterb Posted October 22, 2008 Report Share Posted October 22, 2008 Hi andyc, I wrote that there should be a locking washer between the crank nut and the flywheel, eg: a lock washer under the nut. Only use a lock washer here, not a plain or worn out spring washer - if unable to find such a washer, use a little loctite on the threads after first cleaning the oil off male and female surfaces. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
fastandyc Posted October 22, 2008 Author Report Share Posted October 22, 2008 yeah the original lock washers there,i also have a new spring washer,ill give it a go tonight again! Quote Link to comment Share on other sites More sharing options...
benj Posted October 23, 2008 Report Share Posted October 23, 2008 just a suggestion, could your flywheels taper have worn due to it spinning on the crank especially if there has been broken woodruff keys rubbing inside, this would explain why it comes loose. Quote Link to comment Share on other sites More sharing options...
fastandyc Posted October 23, 2008 Author Report Share Posted October 23, 2008 yip might have to come down to another flywheel if it dosent hold this time1 Quote Link to comment Share on other sites More sharing options...
fastandyc Posted October 23, 2008 Author Report Share Posted October 23, 2008 completely p****d with it now! flywheel stays on now,but bike wont fire! ive got a good spark etc,but bike just refuses to fire up? ive adjusted and readjusted the timing,still no luck? its now beyond a joke! Quote Link to comment Share on other sites More sharing options...
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