Question about Harley Davidson XL 883C Sportster Custom Motorcycles
Posted by Anonymous on
Hi Anonymous, I would definately do a leak down test, it will let you know if you have a ring or piston problem, air noise coming out of the crankcase breather, valve seat problem, air noise coming out of the intake or exhaust ports. What it will not diagnoise is a failed valve seal usually from improper installation or rotating engine before lifters bleed down. When a valve seal comes off the guide it turns from an umbrella into a pump. You should have noticed slight smoking out of the front cylinder exhaust pipe. Good luck
Posted on Apr 20, 2015
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Posted on Jan 02, 2017
SOURCE: crf 250 not running correctly
Dear Wivs 1 hi I am vortash I am thinking this just might be your battery or your magneto , the bike is firing but has not got enough power to sustain it . Most bikes run off the mag once they have started so it should also run off the battery for a while , if the mag was down provided the battery was charged .So sounds like the magneto hasn't charged it , most modern mags have a detachable rectifier or is attached to a rectifier somewhere on the bike . Check the output if you have a multimeter ,if you have a 6volt system it should be producing approx 8-9volts DC , a 12 volt system should produce between 13.5 14.5 dc voltage . I am sure this bike was produced with both depending what market ie USA . Europe , etc
hopefully this will show you if you have a problem there .. However another symptom similar to what you have described is due to a cracked Cylinder sleeve , as it attains an explosives compresion the power is lost from the cylinder hence the bike stops .. you can test this simply by holding a sharp pin on the cylinder face roughly half way down and tracing around the cylinder if the pin finds a crack it will stop abruptly ... indicating it's posistion .
I have disscounted the obvious ie: fuel as you say that you have thouroghuly checked out the fuel system and providing this bike has not been modified in some way I think you have covered most of the area I would . hope this is of help Regards Vortash
Posted on May 14, 2009
No sweat. Screw the idle mixture screw in until it "bottoms out". Do not tighten or you will damage the screw. Back the idle mixture screw out about three turns. Install carburator and check for proper operation.
When you get the bike running, allow it to warm up and then adjust the mixture for highest smoothest idle. Set idle speed to about 1000 rpm with the throttle stop screw.
Posted on Oct 06, 2009
Testimonial: "cracking "
Hi Mate, The XR twin carbs were made '85 - '87. You can not fit a single carb to a twin port inlet manifold. If you were considdering swopping to a single carb cylinder head on the motor, that should fit the motor... BUT... the bike frames are different as to the position of the rear shock which will be smack bang in the way should you try to fit a single carb on a twin carb frame. If you got head problems and find it hard to get a replacement head, try a XR or XL 500 /600 or a GB500 /600 twin carb head.
Posted on Feb 15, 2010
what you need to is pull a plug and see what it looks like this will tell what you need to do to your jetting. yes this could be a lean backfire it could also be fat. if your plugs are looking white your lean if they are back you fat. you need to get the bike fat before you lean it out. the first set in jetting is to get your bike to pull hard under full accl. once you have that then you can work out your idle. don't forget about your air/fuel screw. the air/fuel IS a part of everything from idle to full wide open. do you have pipes and a air filter? the best people to call is factory pro. they make jet kits and i have learned a lot from those kats.they know there poop and can get you set up right. remember to set your rear cyl just a little fatter then the front it will help with cooling. If you need more help please feel free to call me at the shop C.C. Motorsports (361) 885-7787
Posted on Apr 29, 2010
SOURCE: valve timing marks
hey,i have an xlh 883 89 model and i removed the camshaft cover out and one of the camshafts fell off cause the cover was stuck and had to make big pressure on it. i m trying to match the timing marks! is there a mark on the crankshaft sprocket? cause i m seeing a small dot that doesn t match to the other marks. i made it TDC from the inspection hole too, but the marks that have on the book aren t like the marks that i have on the cams how is exactly the camshafts timing? thanks
Posted on Jun 01, 2010
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