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Found 4 results

  1. Need help with my 83-84 xr500r jumped timing need someone who can give me the right motor specs as i know the manuals are not 100%. also pointers on my walkthrew thanks
  2. Looking for a company that sells a seat cover for a 1984 honda xr500r that has the old style square back seat but isnt oem and has some sort of grip on it. I believe it would be the same for xr200, xr350, xr600 and so on. Or maybe I can by a large universal blank seat cover and make it fit. Anyone have experience with this? This is what I currently have but its too slick. Need something with grip.
  3. Taylor R. Boehnlein

    1982 XR500 Help

    Trying to figure out if electrical is working/needs replaced. Generator tested 263 ohms, pulse tested at 99 ohms. Ignition coil primary tested at 1.7 ohms and the secondary at ~60 ohms w/ the spark plug cap. CDI seems to be the issue, but the results almost seem too bad to be true. The only resistance I found was the Green to Black/Red at 147.77x200k ohms, Black/Red to Black/White Kill at 152.2x200k ohms, and Blue/Yellow to Green at 150.1x200k ohms . The OEM manual does say that a specific tester is needed, but that seems like a farce. Any idea what might be going on? CDI's are a little pricey and I would like to not replace unless needed.
  4. Hi all, Will from Melbourne in AUS and I am pleased to finally join ThumperTalk. I'm 9 months into a custom build transplanting an '81 XR500R into a '81 CB250RS and I'd like some advice. I'll start with my question which is a fairly simple one, and then follow up with an answer to some anticipated questions which might help understand what my issue is and what may be causing it. MY QUESTION: Does the CDI box or CDI black box igniter (shindengan) from the CB250 run the XR500? or put in a different way, does the xr500 motor need its original cdi box (which is a round metal box) compared to the rectangular rubber one off the 250, in order to fire? Thanks in advance, Will -break- MY PROBLEM: I can't get the XR500 started, even though it has just had a full-rebuild inc. bore/piston/valves/hydroblast, spark, good fuel, carb-kit, and it was built using torque wrench and some precision around building it which is why I'm surprised it didn't fire straight away. ANSWERS to potential Questions are; 1) What has been blended together between the two bikes? 2) Why on earth am I building a cbxr500rs...? 3) More depth around the issue please? 1) What has been blended together between the two bikes? First off, I used the cb250 wiring loom because it was complete and ready to run the lights which the xr doesn't have. The cb250 & xr500 motors share side covers, and some other parts. Because I want a lighting system and given the XR doesn't have an alternator or wiring for a lighting system, I used the alternator from the 250 which bolted straight into the 500 replacing its original magneto. The Alternator from the 250 is also a bit lighter so it may improve performance. I used the side cover and wiring from the 250 on the same Alternator side for 2 reasons: i) because it was in better condition and, ii) had the wiring plug to go straight into the loom from the 250 as well. A perfect match so it seemed. On the right side, given I had just replaced the pulse-generator wire from the 250 before it died, which cost $100 bucks, and the side cover was once again in better condition (and matched the 500), I used 250 right side cover and its pulse generator on the xr500 which also means it can plug straight into the loom as the xr500 motor had no plug on the end which saved me mucking around. Motor/Running Gear: cb frame & front Yend, xr motor, xr carb, xr rear-wheel to retain ratios, 2 into 1 exhaust from the xr500 which has been custom modified to be 2 into 1 into 4 under the seat! (for looks mostly, although careful attention to pipe diameter taken to retain back pressure and exhaust velocity). The XR500 motor has a new 10.5:1 piston, stage 1 bore to 89.25mm, valve-grind/resit/lap and hydroblast, all new other parts plug/gaskets/oil/seals/carbkit etc etc, xr500 sprocket, weld another row of bars above the frame to accomodate the carb and seat, custom fab on frame/seat etc to accommodate. May make an airbox for it if I think its required. Wiring: cb250 Loom (xr had none), lights etc from the cb250, Regulator Rectifier from the 250 (of course because it is designed for the power of the alternator), but I used the Coil from the 500 motor which is smaller, as the bigger one from 250's was stuffed, Fuses from the 250. *However, I used the CDI box off the 250 (not the 500) because it could plug into the loom, and this is where my question lies? 2) Why on earth am I building a cbxr500rs...? Well, I'm sentimentally attached to the cb250 which I built as a learning project 5 years ago, and I read the xr500 motor fits in the frame and saw someone in the UK which transplanted it I was pretty intrigued. When the cb250 finally died it was a perfect opportunity to hunt for a donor bike and put the xr500 motor in, and also a perfect opportunity to do any modifications/upgrades and servicing to the cb bike which I had originally built on the cheap and now happy to sink money in it. 3) More depth around the firing issue please? It has spark, but won't fire and start even though it seems it really really wants to. Given a fair amount of precision went into building the motor I'm surprised it didn't fire in the first couple of kicks and I've since spent a bit of time trying to get it started to no effect. I'm tempted to check ignition timing using one of those lights, although the one I have is not designed for bikes but cars instead and is a pain the ass to get rigged up!
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