Help me diagnose this engine trouble
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From: PlowBoy on 4 Feb 2010 15:12 there has to be some link between the "camshaft" and the Crank, could be gears I guess... right? or are the intake and exhaust lobes cut into the crankshaft somehow? not that it is a bad idea to do valve timing off crankshaft... "Tiago" <diariodastrilhas(a)gmail.com> wrote in message news:d9319414-f2fd-4af7-a2aa-78d87ce6ffdd(a)g29g2000yqe.googlegroups.com... On Feb 3, 12:05 pm, "PlowBoy" <s...(a)yah.com> wrote: > sound like the timing chain. no timing chain; it's push-rod, like a harley davidson, just this is a single piston. -- t
From: Tiago on 5 Feb 2010 05:24 On Feb 4, 5:12 pm, "PlowBoy" <s...(a)yah.com> wrote: > there has to be some link between the "camshaft" and the Crank, could be > gears I guess... right? or are the intake and exhaust lobes cut into the > crankshaft somehow? not that it is a bad idea to do valve timing off > crankshaft... gears, one big gear, you're right. Only one lobe actuating over two rocker arms pushing the rods up. There's no need to do timing on this engine if you remove just cylinder, because timing is done on the big gear, with big punch marks in it and you have to split cases to remove that gear. The easiest four stroke engine to work on, ever. Top end rebuild is as easy as on a two stroke with powervalve. Today is the surgery, scheduled for 1800 gmt-3. report to follow! -- T
From: HardWorkingDog on 5 Feb 2010 11:12 In article <77f6133c-cc8f-4a3d-bcc4-f37e0b8a8c99(a)a5g2000yqi.googlegroups.com>, Tiago <diariodastrilhas(a)gmail.com> wrote: > Today is the > surgery, scheduled for 1800 gmt-3. report to follow! boa sorte, doctor -- Charles '99 YZ250
From: Beryl on 5 Feb 2010 14:42 PlowBoy wrote: > gears I guess... right? or are the intake and exhaust lobes cut into the > crankshaft somehow? not that it is a bad idea to do valve timing off > crankshaft... Yes, it is a bad idea.
From: Tiago on 8 Feb 2010 06:31
On Feb 5, 1:12 pm, HardWorkingDog <har...(a)mush.man> wrote: > In article > <77f6133c-cc8f-4a3d-bcc4-f37e0b8a8...(a)a5g2000yqi.googlegroups.com>, > > Tiago <diariodastril...(a)gmail.com> wrote: > > Today is the > > surgery, scheduled for 1800 gmt-3. report to follow! > > boa sorte, doctor > > -- > Charles > '99 YZ250 :( bad news, ops, make that terrible news. and good news. let me start with the good ones. one bent shift fork and three gears worn out. forks: http://www.postimage.org/image.php?v=gxbYF7i how do you spell sludge? http://www.postimage.org/image.php?v=gxbYMBJ http://www.postimage.org/image.php?v=PqTo8_A this last picture has a big bearing, the crank bearing... it was hard to clean it all, but all done! http://www.postimage.org/image.php?v=gxbYU59 workbench with the much needed tools http://www.postimage.org/image.php?v=PqTodZS the bad news: the crank bearing I mention is slipping the inner race in the crank. a new crank is over half what the bike worth. this bike is not a keeper, as is my own XR250. What we plan: red loctite over the bearing/crank connection. What do you think? Will it hold? -- T |