scorpalad Posted January 28, 2008 Report Share Posted January 28, 2008 Hi all, I have an 05 sy250. Went out on it yesterday for first time after buying it and had a lovely day. Bike worked well all day then hosed it down and now nothing. There is a spark some fuel is getting through, not sure how much should be comming through when put hand over barrel. Went through stream quite abit bit not to deep. Any info would be very helpful asd I think the bike is lovely to ride. Steve Quote Link to comment Share on other sites More sharing options...
peterb Posted January 28, 2008 Report Share Posted January 28, 2008 Hello scorpalad, My friend has the same 05 bike and had a similar problem, there are 2 areas to look. Check the thermoswitch connections are not shorted at the bottom of the radiator - not really much of a problem but it did seem to affect the bike when wet. T'other area is in the wiring harness, under the tank/seat area there is a plug to socket connecter which has a short loop of wire, this can sometimes be a problem in that it is not making a good contact. I have binned the loop socket and cut off the plug and joined the two wires together with a piece of contact block, no more problems. I had the same problem with an 07 SY recently. You'll see what I mean when you have a look. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
jmutiger Posted January 28, 2008 Report Share Posted January 28, 2008 I would check the air filter, it's under the lowest point of the "seat" and really is a effective trap for dirt mud and grime in the water you might have went through. You could have also got it all wet, and it's just not able to pass much air. Other than that, I can't think of anything likely. Jon Quote Link to comment Share on other sites More sharing options...
scorpalad Posted January 28, 2008 Author Report Share Posted January 28, 2008 Hi, thanks for input. Have checked rad wires seem fine, loop connector seems fine. The air box did have a bit of water and muck in the bottom and I noticed some muck on edge of enterance to carb so maybe some has got in to it. If this is the case I will need t ocheck, so next Q how do you remove carb the easiest way. When it is off this will be the first time of looking at a carb what am I looking at and what should I be looking for. Thanks Steve Quote Link to comment Share on other sites More sharing options...
peterb Posted January 28, 2008 Report Share Posted January 28, 2008 Hi Steve, I'm pretty sure that the shock top mount needs to come out to allow the carb to be removed, just pivot the shock out of the way on the bottom mount. That's after removing the airbox and silencer. The entire carb must be stripped out, all jets and the pilot screw. First, screw in the pilot screw to determine how many turns out it is, then remove. With everything removed, blow clear all the carb passageways, compressor is good for this, then re-assemble. Check if there is a petrol filter either in the carb or in line and if this is clear. You may need silicone RTV for the silencer. Did you check the loop wire connection for continuity? An SY I rode looked ok but had a problem loop causing problem starting and misfiring. When replaced, all was well. Bye, PeterB. Quote Link to comment Share on other sites More sharing options...
paulmac Posted January 29, 2008 Report Share Posted January 29, 2008 (edited) Hi Scorpalad PeterB Edited January 29, 2008 by paulmac Quote Link to comment Share on other sites More sharing options...
scorpalad Posted January 29, 2008 Author Report Share Posted January 29, 2008 Thanks alot for the replies. When you have not done anything like this before it can seem abit daunting. Good tip about filter will get one on order asap. Thanks Steve Quote Link to comment Share on other sites More sharing options...
paulmac Posted January 30, 2008 Report Share Posted January 30, 2008 No worries Mate If you've not stripped a carb before get yourself set up in clean area - kitchen paper on the bench is good idea - clean and it helps you see all the bits. Turn the carb upside-down, undo the four screws on the float bowl and lift the off the bowl. The floats are held in by a little rod, pull it out and check how the needle valve (it looks like a little brass plumb bob) slips into a grove on the brass float tab. If you're ordering a fuel filter you might order a new needle valve too. They have seat at the pointy end that wears out so a new one now is good preventative maintenance. Paul Mac Quote Link to comment Share on other sites More sharing options...
petertlr Posted February 9, 2008 Report Share Posted February 9, 2008 I find that if you are getting spark (kick it over with the plug out & grounded) and gas (plug is wet) then usually it will at least show signs of starting if you clean and dry the plug good and try starting it with very little gas. If it "pops" some but runs erradic, I suggest you clean the carb, but in cleaning the jets, blowing them out with compressed air won't do. You must get a very fine wire (unbraid the threads of a motorcycle wire) and ream it thru the jets completely. This is because the gas nowadays has Ethanol which clogs the small jets easily, and won't blow out with compressed air. This happened to a bike I bought and it ran perfectly afterwards. Good luck. Quote Link to comment Share on other sites More sharing options...
scorpalad Posted February 9, 2008 Author Report Share Posted February 9, 2008 Thanks for the tips. I thought I would give the bike one last chance before getting down to stripping bits of and bugger me she fired up. Why then I don't know but it is running ok now. Steve Quote Link to comment Share on other sites More sharing options...
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