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03-09-2013, 11:40 PM | #1 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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2001 Hyosung Sense 2T Issues
Hi all,
So I bought this 2001 Hyosung sense that had been sitting for 2 years. Replaced the spark plug, drained the old gas and replaced with new 94 octane ethanol free, removed/cleaned the carb bowl and sprayed out the jets with carb cleaner. I got it to run, but it does not run well at full throttle. It runs fine until it warms up, but then starts to sputter/backfire at full throttle and starts to smoke a fair bit when warm. Idles fine and runs ok at mid throttle, just full throttle is the problem. I didn't disassemble the carb other than taking off the bowl, and there was definitely varnish/crud in the bowl when I removed it for cleaning. Should I pull the jets out and check them properly? I'm thinking carb problem or maybe reeds, what do you guys think? |
03-10-2013, 07:13 AM | #2 |
Join Date: Oct 2012
Location: Germany
Posts: 140
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Cracked intake?
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50cc 139QMB, 7g sliders, manual petcock w/ transparent lines, Naraku CDI, Naraku belt, high output racing coil, 18.4mm CVK clone w/ #85 mj and #38 idle, needle @ leanest, OEM pipe mod, Kenda tires, NGK Iridium, lots of LED mods, 2.61L/100km (90 MPG) |
03-10-2013, 12:32 PM | #3 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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Is it designed for the anti-detonating POWER of 94 rated fuel...?
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-10-2013, 12:43 PM | #4 |
Join Date: Sep 2012
Location: West Haven CT
Posts: 1,165
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Hi
Welcome aboard Pleased to meet you I would give the carburator a thorough cleaning and tune up, add some sea foam to the fuel , run that tank and see if it clears up http://www.seafoamsales.com/sea-foam-motor-treatment/ If not then we can look into other causes Take care and ride safely Yours Hank
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"4wheels move the body 2 wheels move the soul" Duty, Honor, Country. Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be. Douglas MacArthur |
03-10-2013, 02:17 PM | #5 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Thanks for the welcome. I used to lurk on the old scootdawg forums back when I had a 139qmb 4 stroke, but this is my first foray into 2 strokes.
Conveniently I have a can of seafoam sitting around that I was going to use on an old car but never did. I'll throw some in the tank, clean the carb properly, and see what happens. Thanks |
03-11-2013, 01:18 AM | #6 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Ok, so I pulled the new plug to check it, tightened the head bolts, cleaned the carb again, and put some seafoam in the tank as well as spraying it in the carb. I haven't had a chance to run it WOT yet to check my work, but it did start right back up as soon as I put everything back together.
Anyway, here is the plug: |
03-11-2013, 01:19 AM | #7 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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03-11-2013, 11:33 PM | #8 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Ran it today, seems to run better now! No more backfiring at full throttle, but it does still smoke a bit. Hoping that will clear up with some riding around.
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03-12-2013, 05:26 PM | #9 |
Join Date: Aug 2011
Location: Tierra Azul, NM
Posts: 739
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I'm no genius but I think the 2 stroke engine was designed to smoke just a bit...
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Do not fear mistakes. You will know failure. Continue to reach out. - Benjamin Franklin Join the HARDCORE 1983 Honda GL650I SilverWing |
03-12-2013, 05:58 PM | #10 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Yea, I knew that, it just seemed like a bit more than I would expect, and didn't have the typical 2 stroke exhaust smell. I'm thinking a bunch of oily junk just built up in there while it was sitting and that I need to burn it out thoroughly. Seems like there used to be an exhaust leak as well, since there was some oil around the exhaust pipe flange. I tightened the flange bolts up though, should be good. Picking up a helmet tonight so I can register it and legally take it for a spin.
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03-12-2013, 06:11 PM | #11 | |
Join Date: Sep 2012
Location: West Haven CT
Posts: 1,165
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Quote:
Its good to see you got her running well, and its normal for them to smoke alittle and if you let them sit a while then carbon can build up and make them smoke more then normal, that should pass in time as the engine gets more use Are you using a quality 2 stroke oil as that will help keep the smoking down I use Royal Purple for my "April" http://royalpurpleconsumer.com/produ...le-engine-oil/ Take care and ride safely Yours Hank
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"4wheels move the body 2 wheels move the soul" Duty, Honor, Country. Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be. Douglas MacArthur |
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03-12-2013, 06:24 PM | #12 | |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Quote:
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03-19-2013, 02:15 AM | #13 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Finally got it out for a run tonight! Engine runs great, and the smoking stopped after the first 10-15min of my ride!
Tops out at around 60km/h with the blue CDI wire removed, so I'm thinking I need to get into the transmission now. Probably needs a new belt and some rollers/sliders to refresh things in there. Pretty good though for $400 and a few hours work! |
03-22-2013, 02:00 PM | #14 |
Join Date: Mar 2013
Location: Vancouver, BC
Posts: 198
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Snapped a pic yesterday:
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03-22-2013, 03:04 PM | #15 |
Join Date: Apr 2011
Location: NY
Posts: 994
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