badass76 Posted August 22, 2004 Report Share Posted August 22, 2004 Hi i have just started having problems with my 99 techno 250 at low revs it will run fine one minuite and the next i can feel the engine knocking and backfiring . i replaced the plug and put new fuel in it ran ok untill i put it through the gears and built some speed up after it started playing up again please help me. Quote Link to comment Share on other sites More sharing options...
jaylael Posted August 22, 2004 Report Share Posted August 22, 2004 This could be a lean condition due to fuel flow /starvation issues, water in float bowl, shorting kill button, loose electrical connections to coil or module, poor plug cap connection to plug lead, or lastly the dreaded ignition module failure. Don't suppose you have a friend with another similar Beta you could try swapping parts with. The knocking and backfire most likely are resulting from errattic spark timing. Hook up a timing light and run it up to farting rpm and you will observe the timing is jumping all over the place. If it is, you can safely assume it's a spark related problem. Next job should be to ohm check the stator. Many months ago I posted the ohms specs for the stator. Maybe you could still find them in the archives. Once the stator is verified good, it would be time to take the financial gamble and buy a new ignition module. Good luck. Jay Quote Link to comment Share on other sites More sharing options...
badass76 Posted August 22, 2004 Author Report Share Posted August 22, 2004 Jay did you leave the ohm readings in the Beta pages or mechanical i cant find them ? does any one else know? Quote Link to comment Share on other sites More sharing options...
jaylael Posted August 22, 2004 Report Share Posted August 22, 2004 O.K. it appears that it was over a year ago and it has dropped off the back end of this bulletin board. It was on "Beta". The way I remember this is, there are two black with white stripe wires to the lower unit that should read about 500 ohms to ground. The white trigger wire should read about 120 ohms. The black wire, I don't know what it's for. I had no useful readings on it. This is from memory. Check it and see if this is right. Jay Quote Link to comment Share on other sites More sharing options...
lineaway Posted August 24, 2004 Report Share Posted August 24, 2004 Also pull the flywheel and check the woodruff key that holds it in place on the crankshaft. Quote Link to comment Share on other sites More sharing options...
badass76 Posted August 24, 2004 Author Report Share Posted August 24, 2004 (edited) thanks for that i am off to sunny wales for a week now will try your ideas when i get back Edited August 27, 2004 by badass76 Quote Link to comment Share on other sites More sharing options...
badass76 Posted September 4, 2004 Author Report Share Posted September 4, 2004 I am the proud owner of a correctly running Techno, i purchased a new ignition module and it runs perfect now. can you recomend what lubrication i should use in the gearbox and how much and how to set up my suspension Thanks again Paul Neville Quote Link to comment Share on other sites More sharing options...
beta boy Posted September 4, 2004 Report Share Posted September 4, 2004 in your gearbox use pj1 light clutch tunner sae 80w http://www.bvm-moto.co.uk/oilsetc.htm#pj1 and for the suspension set it up what feels right to you loads of people have suposedly set my suspension properly for trials and and it does not feal right just dont have it real stiff keep it soft Quote Link to comment Share on other sites More sharing options...
badass76 Posted September 4, 2004 Author Report Share Posted September 4, 2004 Beta boy how do you set up your air mixture screw Quote Link to comment Share on other sites More sharing options...
beta boy Posted September 4, 2004 Report Share Posted September 4, 2004 dunno never needed to do it so dont have a clue Quote Link to comment Share on other sites More sharing options...
badass76 Posted September 4, 2004 Author Report Share Posted September 4, 2004 betaboy have you ever had a problem getting on to the scottish trials site where you got your clothing from Quote Link to comment Share on other sites More sharing options...
beta boy Posted September 4, 2004 Report Share Posted September 4, 2004 i didn't get my stuff from scotish trial i got them from www.bvm-moto.com 1. cause they are cheap 2.cause there is a 20% on all hebo clothing 3.cause they allways get it to me the next day and i do have trouble getting onto the english version of scotish trial it is real anoying Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.