trialsryder

Well, as much as I hate to admit this...I was the culprit all the long. In my original haste to dissassemble, clean, drain and ride this bike during the initial hydro-lock, I failed to notice that the tangs on the float assembly need to capture the T-head on the float-valve needle, not rest on them. So, I was assembling the needle in the closed position. I am so embarrassed to admit this. I am only posting this so that some other hapless being may avoid the weeks of downtime I have had dealing with a very clueless mistake. Everything happens for a reason. Thanks for all assistance and information.

I checked the fuel line - clear as day. I have not had time to disassemble the carb to clean the float-valve and check float height. The bike ran perfectly before the hydro-lock situation (probably due to float-needle stuck open). I do not suspect the float height yet. I am looking closely at the float-needle as the culprit. I will advise when I have disassembled again. Thanks for all information so far.

I disassembled the carb again and lubed the choke mechanism with some 2 stroke oil. My choke is working better now. My bike is still not starting (see other post) and I believe the problem is with the float-valve needing replacement - which I am working on. Robdyson: You might want to check your float height measurement. It could be you have too much fuel in your float bowl (float level too high). I believe this would cause fuel to constantly be flowing out the overflow breather tube, thus the poor fuel economy. Just a thought. Others may have a better answer.

Update (fwiw): Engine is getting spark. Fuel is not flowing into the float bowl. Petcock flows fuel when not attached. I plan to disassemble the carb again today, clean the float valve once more, remove inspect and clean the fuel-line and fuel petcock. If anyone has any additional wisdom it would be appreciated.

I cleaned the carb completely. I am confident it is clean. I believe my problem was fuel still in the cylinder thus fouling the plug. I left the plug out for a couple days to allow the fuel to vaporize. Today, cylinder dry, fresh plug, no spark with new plug againt head. Assembled, will not start or give any hint of starting. I am beside myself.

I am not too far from that now. Today I put in a fresh spark plug. I turned the engine over with the plug against the head, but was unable to see any spark. I put it together and tried to start it (thinking maybe I could not see the spark) but alas, no fire. I could puke. I will be doing a search for "sy250 won't start" - new merry-go-round. Any thoughts on what electrical circuitry I have fried? I had a bad feeling when I saw fuel pouring over the electrical wiring attached to the frame backbone - when it was upside down - shop rag or not. Thoughts?

I don't mean to be so prolific here, but the choke plunger on my SY250 is an absolute bear to bring up into the choke position. It requires me crouched beside the bike, using both index fingers on either side of the button, and pulling up hard until, maybe, click, it goes, or not. Very difficult. First, I lubed it with some WD-40, which may have helped, a bit. Then I disassembled it, and cleaned it (with the rest of the carb ala tailgate - haha) which only made it worse. Does anyone have any ideas? Thanks in advance.

All good points and wisdom. Thank you. Any additional humor, or recommendations, welcome.

I tell you, I needed a good laugh after that afternoon, because that is all I could do. More??? Anyone???

Yes, the little French mistress and I had a rendezvouz today, and boy was it dirty. I stole a few hours today to take out my new-to-me '07 SY250 out for a spin. I unloaded the bike and turned the gas on, as usual, and got dressed. When I attempted to start the bike - hydro-locked. The motor was filled with gas. Yeah...it was that good. So, I threw my gloves at the truck, uttered a whole bunch of choice words fit for the dirty little mistress that she is, and tore the bike down. There I was, carburetor torn apart on the tailgate of my truck, bike upside down draining fuel from the cylinder, in 90 degrees Ferhenheit. By God's grace I had some compressed air in a can, and a can of brake cleaner. When it was all drained, dried, and put back together, I kicked it about ten times and it went "Woof". "At least I can ride." Or so I thought. I put my helmet on, kicked it again and it fired, blew a bunch of smoke, bogged down, and died. Another kick, fired good, bogged, died, and would not restart. I am hoping the plug is just fouled. I kicked it again when I arrived home (hour later) nothing. I am very suspicious. Anyone have any thoughts?

Thanks for the information. The '07 was the last year to have the Paoli fork. I want to be extra careful working on this bike. Working on it feels like adjusting a watch, and I do not want to slip something and be sidelined for a month waiting for parts. Anyone know how to relocate the thermostat into the water pipe coming from the cylinder head?

I am new to the Trial/Scorpa world. I need to do some maintenance to my, new-to-me, '07 Scorpa SY 250. My manual is lacking in the area of torque values for; triple-clamps, axle pinch bolts, headset, etc. I searched the Ryan Young website for general values, but came up empty. Does anyone have this information, or a viable link to the correct information? Any assistance would be greatly appreciated. PS - Will regular industrial bearings work in the front wheel, or do I need to purchase "Scorpa" specific bearings?