johnny wishbone Posted January 22, 2007 Report Share Posted January 22, 2007 (edited) Hi folks, new to the forum, just getting back into trialing after a few (many) years away... I picked up a 96/97 Techno a couple of weeks ago and since last week the bike just will not start. This is my first stroker so I'm not 100% sure of myself when diagnosing problems! I have read the posts about turing off the fuel tap etc... and I have checked everything... I have a good meaty blue spark, I changed the HT to one from my VOR which I know is good (so no arcing), there's fuel getting to the carb... I have pretty much checked all I can.... with the exception of stripping the carb. I put fresh mix in it yesterday thinking that being Italian it's probably like the VOR I have which is super sensitive to 'stale' petrol (the bike was sitting up a for a few months before I bought it) - no joy. But as I was kicking it over I discover that there was petrol dripping from one of the exhaust joints... surely this isn't normal!? Instead of air/fuel being drawn into the cylinder it looks like it's just pure petrol. This would suggest to me that perhaps my floats are stuck, but I don't have fuel piddling out of the overflow... so maybe not... I checked the idle mixture screw and it was only turned out half a turn which to me suggests it's been running extremely rich, and in fact, when I stuck my finger into the exhaust it was full of sticky black burnt oil. So, my questions are: 1. Does it look like the carb is the key? 2. Does anyone have carb settings for the Techno? (it's the Mikuni carb) 3. Does the oily/sticky exhaust sound like she's been running far too rich/or with too much oil in the mix? Thanks in advance, J. Edited January 22, 2007 by johnny wishbone Quote Link to comment Share on other sites More sharing options...
the addict Posted January 22, 2007 Report Share Posted January 22, 2007 (edited) Sounds like its flooding when you try and start it, was the plug wet? The fuel coming out of the header is a sign of flooding, next time you try and start it switch the fuel tap on to let the carb fill and then knock it off, try kicking it over then. If its been stood all sorts of muck may be coating the carb (old oil/petrol etc) so I would give the carb and jets a bloody good clean before trying anything else. It should still start with the air screw in or out so I would nt worry too much about that. Most Betas run rich and the black stuff in the tail pipe is pretty normal, most of the time the bikes are run on next to no throttle so they build up the muck quite quickly. Dirty carb is probably the problem, easy job to clean, best with an air line but if not a powerfull carb cleaner spray. Edited January 22, 2007 by Betarev3 Quote Link to comment Share on other sites More sharing options...
leggins Posted January 22, 2007 Report Share Posted January 22, 2007 (edited) Sounds like carb problem to me . I had lots of problems with mine when it was new to me. Like betarev3 said stirp the carb down and give it a good blast of carb cleaner. While youve got it stripped down do the mods on r2w,s web site ( maybe someone will post the correct web address for you ) these only take a couple of mins but are well worth it . I would give it another turn out on the air screw , new plug and give that a try . let us know how you get on . cheers Leggins p.s found it www.r2wtrials.com search.. betacarbsetup Edited January 22, 2007 by leggins Quote Link to comment Share on other sites More sharing options...
johnny wishbone Posted January 22, 2007 Author Report Share Posted January 22, 2007 Thanks guys. I'm just after stripping and cleaning the carb - it was really filthy!! I couldn't believe the amount of crud that came out of it. I'll reassemble and try it tomorrow evening and let you know how I get on. I'll have a go at the carb mods once I get the thing running again - I'm reluctant to change anything until I get it running again Thanks again! J. Quote Link to comment Share on other sites More sharing options...
phil Posted January 22, 2007 Report Share Posted January 22, 2007 Sorry for jumping in but sort of on the same topic, my techno has been playing up for a while and now i've giot her going again, throttle is wooly in the mid-range which from my experience with cars would point to either fuel starvation, an air leak or ignition timing, I've put a different stator on (roughly where the old one was) and cleaned the carb without changing anything, are there any base settings available for me to work from ? Cheers Phil Quote Link to comment Share on other sites More sharing options...
johnny wishbone Posted January 23, 2007 Author Report Share Posted January 23, 2007 Ok guys, the carb is back in and after about 5 minutes of kicking and kicking she fired into life She's starting now 1st kick... ****, that reminds me, better turn off the fuel tap.... Phil, you mean carb settings? I have my air screw turned 1 full turn out, and she's running very VERY rich, so I would imagine that 2 to 2.5 turns out should see it running better. Also, the idle speed screw doesn't do anything after the 4th turn out (Mikuni carb) so you'll need to screw it in all the way, and try it from 4 turns out and keep turning it in half a turn. I had no settings to go by either but mine seems to be running well now. I will have a play with the idle mixture screw tomorrow, but I'd say 2 turns out at least is ballpark... Quote Link to comment Share on other sites More sharing options...
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