Jordon KE... Posted November 10, 2015 Share Posted November 10, 2015 So time for another project!! On the weekend i was thinking of a project that i could be a bit more creative and rat style with so thought i might dabble with a velo bike. Just so happens that on Monday i found an old Honda GX140 powered generator, 3.7kw 144cc. Been lying around for years and probably hasn't been started for several. Took the opportunity and made a deal. So i took it home gave it a clean up, removed the genie put some petrol in there and pulled the chord... wishful thinking that it would fire up. Bled the carb, checked the spark, topped up the oil and still no go. Im going to drain the oil and replace it, change the plug and try again. next ill clean the carb. Does anyone have any advice on what could be causing it not to fire or dealt with these engines before. Its turning over fine has a bit of resistance as you try to start it, just doesn't seem to be firing. Working on a style at the moment, have a few ideas but nothing set on paper yet. Want to get the motor going and get some wheels then go from there. 2 Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted November 10, 2015 Share Posted November 10, 2015 Bugger hand cranking, if you can get a battery drill on it haha. Certainly made starting my sachs rotary easy Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 10, 2015 Share Posted November 10, 2015 my gx starts pretty easy..... but yeah, new plug, make sure its got sweet spark, and there is no harm in cleaning the carb, my guess is bowl is full of crap etc Quote Link to comment Share on other sites More sharing options...
TimShadboltfan27 Posted November 10, 2015 Share Posted November 10, 2015 yeah as above, stick to the basics with these things, good spark and a clean carb are usually all they need. we run the 6.5hp gx's at my work (indoor kart track) and they never give up. also maybe a bit of jump start or lynx down the carb doesn't go astray Quote Link to comment Share on other sites More sharing options...
fletch Posted November 10, 2015 Share Posted November 10, 2015 Check the coil to flywheel gap. I usually go for 1x business card thickness Quote Link to comment Share on other sites More sharing options...
Adoom Posted November 10, 2015 Share Posted November 10, 2015 Remove the flywheel and clean the points with some fine sandpaper. That's what was wrong with mine that had been sitting for 20 years. 1 Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 10, 2015 Author Share Posted November 10, 2015 Awesome cheers guys, yeah i started removing covers to remove flywheel and clean the points last night. Might as well! Adjusted coil to flywheel gap last night, made no difference. Ill get onto this stuff tonight and update Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 10, 2015 Share Posted November 10, 2015 yeah not points on these bad boys I believe If you have spark, then you are good. Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 10, 2015 Share Posted November 10, 2015 also, without sounding retarded, make sure you are choke and full throttle on start up. Rich is good. Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 11, 2015 Author Share Posted November 11, 2015 Ah ok i thoughts they were points. Haha yeah ive made sureof that, even poured a bit of fuel in there. Quote Link to comment Share on other sites More sharing options...
Steelies Posted November 11, 2015 Share Posted November 11, 2015 it seems spark is the most mysterious out of the required things for bang bang, and isnt always the same under comp as it is on the bench. maybe hand choke it for a couple pulls till you get a wet palm to make sure carb is doing something? /check plug after starting attempts, if it's wet go back to spark etc 1 Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 11, 2015 Author Share Posted November 11, 2015 Changed spark plug... Still no go, poured some more petrol into the spark plug hole and holly shit something happened. Stripped down the carb went to joes and cleaned out the stem that runs into the bowl,mhad a yarn and came up with a few ideas for the bike. Left the lovely broad meadows And reassembled carb. Pumped some fuel in her and bang bang she runs. Was getting a bit late to run an engine especially with no exhaust so will have another play tomorrow 2 Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 12, 2015 Author Share Posted November 12, 2015 Ok so now thats its running ok i have to solve the problem of the tapered shaft. Maybe get a taper lock drive? or turn off the taper and mill a key way, Is it worth pulling apart to do this...? Behind the taper the parallel shaft is a decent length. Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 12, 2015 Share Posted November 12, 2015 Question. you said it was a generator, what was attached to the taper? My motor was from a genny, had a tapered shaft, and a longish piece that attached to the rotor of the genny, I cut it off, and just bolted it back on..... hard to explain. you can always come check out my bike for ideas. Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 13, 2015 Author Share Posted November 13, 2015 Yeah could do that or could just weld the drive to the shaft Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 13, 2015 Share Posted November 13, 2015 tapered welding like a boss Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 15, 2015 Author Share Posted November 15, 2015 Haha no tapered welding, I have sorted the drive, machined up a sleeve with a keyway. The output shaft is tapered then steps up to a parallel shaft, i have chopped the tapered part off and will weld my sleeve onto the parallel section of the out put shaft. This means i now have a 1.00" shaft with a 0.25" key. Downside is if the seal leaks i'm probably screwed. I wouldn't think it would ever be a problem, might replace it before welding Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted November 16, 2015 Share Posted November 16, 2015 I had to replace the seal on mine when I first pulled it apart, turns out that was the reason it was in the scrap bin a bunnings to begin with. 1 Quote Link to comment Share on other sites More sharing options...
Jordon KE... Posted November 16, 2015 Author Share Posted November 16, 2015 Haha what a joke, ok sweet will definitely change it. Thanks for the info man. Quote Link to comment Share on other sites More sharing options...
Steelies Posted November 16, 2015 Share Posted November 16, 2015 wait till you hear how he got it out of the scrap bin 1 Quote Link to comment Share on other sites More sharing options...
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