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Post by brokenicarus on Apr 13, 2007 2:30:34 GMT -5
Yeah, I took out the stock airbox and put on a LARGE K&N, replacing the crankcase breather with a little K&N direct as well. I had my buddies small K&N on the bike a day or so ago and she started and ran just fine, needed a little adjustment on the mixture screw and the idle adjuster.
Now she won't start. I'm getting a weakish spark from the plug (just replaced the battery w/ a capacitor) so I'll replace that, but it should still come to life, it's not that weak. I also tried it with the battery re-hooked up to no avail.
Question: if I think the culprit is running lean, where should I start to diagnose that? will it start if I hold the throttle 1/4 open? or if I put on the choke? And does the mixture screw make enough of a difference or do I need to bump up a pilot jet size?
Some things I'm concerned about that I haven't noticed before (only had the bike a month), if anyone can confirm they're normal I won't lose sleep:
The crankcase breather stock tubing (the funnel shaped thing that connects to the airbox) had some metal shavings in it when I removed it. Normal?
The bike makes a light racheting sound when rolling forward in neutral, from either the crankcase filter or the kick-starter. Normal?
Bike makes a crazy aspiration sound when I kickstart it from the crankcase filter. Normal?
Thanks for answering all my neurotic questions, Tomorrow the fiddling ensues!
Davey
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Post by aero on Apr 13, 2007 4:39:20 GMT -5
OK For a start the battery will make NO difference AT ALL to the ignition. The ignition is self generating and completely separate from the rest of the bike's electrics. Bit like an old magneto, except in this case its all electronic.
The SR is very sensitive to having its carb messed about with when it comes to starting. If you've changed the air filter its the carb that will be causing the problems.
The breather will wheeze as its there to allow for the air displaced from under the piston. There shouldn't be metal in it though. clean it out and see if more appears.
As to the ratcheting noise, are you sure the kick starter is fully disengaging?
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Post by brokenicarus on Apr 13, 2007 10:50:35 GMT -5
cool, thanks for the advice, that's a great starting point. I wonder if the shavings and the racheting sound are related? The kick start doesn't seem to be moving at all when it's rolling, however.
thanks,
Davey
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Post by aero on Apr 14, 2007 10:57:25 GMT -5
Get it staretd and give it a good thrashing...soon see whats good and whats not.
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Post by brokenicarus on Apr 14, 2007 11:22:50 GMT -5
Oh man, motorcycles are so fickle, they drive me mad but I love them to death. I swear I must have kicked it 90 times in the last couple days, without a single response from the bike. I had kicked it with every possible combination of choke, hot start, idle adjustment, mixture screw known to man, cleaned the plug several times, nothing. Today I was going to dissassemble the carb again and start fiddling within, but the old owners has thrashed about every bolt in the carbie, so I had to get a few bolts before I could start in. At the dealer I picked up a couple plugs. Got home, threw in one plug, bike starts up first kick, singing away like it's been running fine all it's life. It runs and roars and pulls up to 60+ mph, I think it's still running lean, but there it is, arbitrarily back to life. Fickle lady, I need to think of a good name for her. I'm thinking down a peg on the needle and maybe a size larger pilot jet for a richer run, sound good? Oh, and does anyone know which direction you turn the mixture screw to make it leaner/richer? I'd hate to make things worse by fiddling. Thanks for the help Aero, I'll take your advice to the letter  |
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Post by davedunsboro on Apr 14, 2007 22:03:20 GMT -5
I usually adjust up the idle till it runs then I tweek the mixture in and out and listen for change. If it starts to splutter tweek it the other way till it does it again then listen carefully there should be a sweet spot & there it is . I had a similiar problem getting a bike running last week , I had it running in the morning beautiful put it together for a quick hack & bugger me it wouldn't even fire & the battery went flat also so I put the battery on charge & went back next morning took the plugs out cleaned & dried them back in (this time no choke) , bingo it just didn't like a guts full of fuel . Its run like a ripper ever since . I always walk away from my bikes when they get temperamental or they always get the better of you , have a beer or a cup of tea that usually does the trick . Hope this helps cheers Dave .
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Post by davedunsboro on Apr 22, 2007 7:05:31 GMT -5
Sorry mate for the bum steer there isn't any mixture adjust on the standard SR500 carbie . I was playing with my SR250 so it slipped my mind when I described the tuning method SR500 is set with a jet & I don't think it can be adjusted cheers Dave .
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Post by StewRoss on Apr 23, 2007 4:30:12 GMT -5
Hi Dave, You are able to adjust the mixture on the earlier SR's...the adjustment screw is located below the outlet spigot on the engine side of the carby...it may be under a cover or have a plastic adjustment restrictor cap fitted. Just remove both.. Some have the screws loctited in situ I understand...not struck this myself, possibly some US models...heat would probably fix that... SR |
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