Iam about too buy a very restored 84cr500 for vintage racing everyone seems to have issues with them pinging etc its nice too hear from someone who knows them.I have raced a 87 cr500 in the finke desert race australia, put it in the top ten.We used av gas 100 percent get the jetting right and you could hold it flat for ever,providing you had the road ofcourse.I dont seem to have these issues.
My head is stock, with 1 gasket.
I run 1 gal of 111 octane to 4 gals of 91 pump gas, I have ridden with just 91 pump gas. I add the high octane for piece of mind.
I do not however run the stock carb, which is the same carb as the cr480.
I had a 38mm TM, but now run a late model cr500 PJ.
My bike is set up for dez and trails, clarke 4 gal tank, new dg pipe and silencer, sparky, 90mm bore.
She hits harder and is more fun(seat of pants) then my water cooled 1990.
I also had Randy Jackson(formerly of FCR suspension) of R2 performance set up the boingers for my weight and riding style. I am a member of cr500rider(dot)com and ride with lots of watercooled 500's.
Let me assure you, the water cooled bikes have no advantage in engine performance other than aftermarket support.
Old post, I had an 84 500R and it didn't ping or fry pistons? I raced it and trail rode it for fun, and it ran great on 91 octane and 40-1 maxima 927 oil. I pulled the jug off and inspected it and cleand it up and installed fresh top end parts, but my piston showed regular 2-t wear like my cr-2fiddy. So this seems odd to me. I would never ruin a classic and run super moto or anything like it. Leave the dang thing stock, these 80's machines are going up in value dont ruin it. For petes sake! LOL, I loved that bike, it was a blast!Eric or Rich, or anyone else, I'm just curious about the 1984 CR500's actual combustion physics and/or other factors that made this thing fry pistons every month and ping like hell. What exactly was it about that bike? Anything that serious/consistent has to be a major design flaw. I'm wondering what did they do, or how did they fix it for the following year?
I put it in this forum, because I'm sure the explanation is quite complex. Was it a chamber, quench/squish, dynamic compression, or ignition timing issue?
Just curious.
:think
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