(Date Posted:06/07/2005 12:43 AM)
from what I can see a "RFVC" is not a whole lot different in design than the beloved original XL motors. 4 valve head single overhead cam. Yea the rockers are different and the valve spread / spacing but pretty much the same - I think the intention was for them to "breathe" better. They do run hot! my 87 XL600R ran hot as does the new 05 BRP (XR650L) - they say because they are so lean stock. If you uncork it and open up the airbox, remove the restrictive airbox snorkle and rejet the carb, drill and shim the slide and remove the emission octopus that it richens it up and makes it run like a beast and that it runs cooler too! (richer = cooler) however IMHO the BRP in stock form is a beast! more power than anyone could ever reasonably use off road! I guess you need to be young and really power hungry to want to mdify it for more power!
I rode my 1975 XL-125 in the woods the other day and around my property and man oh man what a blast! I could ride it all day long! no effort, light, just fun! and in the tight stuff, the BRP would see nothing more than the dissappearing tail-light of a 125 (in tight woods)
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2005 XR650L, 2004 XR250R, 1974 XL350, 1972 XL250, 1975 XL175, 1975 XL-125 and 2 woods playbikes, 1973 XL250, 1975 XL350. 1972 TS-125J
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