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From: acs on 14 Jul 2008 14:22 Hi all, I saw some good answers to XV535 questions, so maybe you can help me out. First up is some background, but if your not interested, you can skip this next paragraph. It�s important to note that I have not owned a 535 up to now (or any twin this small), so I don�t know how normal/abnormal the below is. I got the bike very, very cheap as it was not running, but nearly perfect in looks and put it aside as a project. Lately, I started repairing it and rebuilt the carbs, pumped out the tanks, and verified the spark. I got it running but very poorly. Turned out the front cylinder was dead due to a vacume leak at the boot. (btw, getting these carbs out is great fun :evil: , but on the second go, I found the trick to do it relatively easy). Replacing the boots and O-rings corrected it, but the thing is still kinda doggy and lacks power. Adjusting the carbs with a hand-held digi-tach helped, but even still, it is virtually unrideable for the first 5-mins. After about 15mins of riding, the bike seems to finally wake up and rides fine, idles fine. Till its warm, you have to run it full choke, and even then it seems to idle grudgingly from 5-10mins, stalling being fairly common unless you actively rev it time to time. At this point, I have noticed the front cylinder heats up at about twice the speed of the rear. On to the question. Finally, I did something I probably should have done earlier: whipped out the compression gauge and checked the thing out. The front is about 150 lbs, the rear about 123, which is out of spec according to the manual. My question is: granted it is not up to par, but 123 is not terribly bad either, yet I have no perfectly running 535 to judge it against. Could this compression cause it to run this poorly? (or to put it another way: are they this sensitive to compression?) -mike -- Posted at author's request, using moderated http://www.MotorcycleForumz.com interface Thread archive: http://www.MotorcycleForumz.com/XV535-compression-ftopict165370.html
From: someone on 14 Jul 2008 16:49 In article <7807227_da23d2c66fd24553bc3385add17a42d7(a)motorcycleforumz.com>, acs <none(a)000.com> wrote: >Hi all, > >I saw some good answers to XV535 questions, so maybe you can help me >out. First up is some background, but if your not interested, you can >skip this next paragraph. It�s important to note that I have not owned >a 535 up to now (or any twin this small), so I don�t know how >normal/abnormal the below is. > >I got the bike very, very cheap as it was not running, but nearly >perfect in looks and put it aside as a project. Lately, I started >repairing it and rebuilt the carbs, pumped out the tanks, and verified >the spark. I got it running but very poorly. Turned out the front >cylinder was dead due to a vacume leak at the boot. (btw, getting >these carbs out is great fun :evil: , but on the second go, I found >the trick to do it relatively easy). Replacing the boots and O-rings >corrected it, but the thing is still kinda doggy and lacks power. >Adjusting the carbs with a hand-held digi-tach helped, but even still, >it is virtually unrideable for the first 5-mins. After about 15mins of >riding, the bike seems to finally wake up and rides fine, idles fine. >Till its warm, you have to run it full choke, and even then it seems >to idle grudgingly from 5-10mins, stalling being fairly common unless >you actively rev it time to time. At this point, I have noticed the >front cylinder heats up at about twice the speed of the rear. > >On to the question. Finally, I did something I probably should have >done earlier: whipped out the compression gauge and checked the thing >out. The front is about 150 lbs, the rear about 123, which is out of >spec according to the manual. My question is: granted it is not up to >par, but 123 is not terribly bad either, yet I have no perfectly >running 535 to judge it against. Could this compression cause it to >run this poorly? (or to put it another way: are they this sensitive to >compression?) > >-mike > don't forget that they are only 535cc. and they were never hot bikes. the compression issue has an effect but are you expecting more out of it? i don't think they made much hp. you can hot rod one a bit and make it much quicker. you should search the google/yahoo groups for that model specifically. bet you'll find a lot more info.
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