biffsgasgas Posted July 11, 2007 Report Share Posted July 11, 2007 The internet is a great thing but I just couldn't find out how to time my tl 125 k2. I had a worn gear bushing and a bad one way for the kick starter. With a set of new gaskets from bike bandit i have dug into the internals and gone though the gear box. I am all sorted out now but decided to give the ole beast a new set of cam and crank gears along with a timing chain. I felt it deserved the attention. I am at the point where i want to get this thing timed. I discovered that the crank gear is a pressed on with NO key way???? Ok well i might for go the crank gear because mine seems to be in good condition with nice square teeth. I have the new one but if it is not broke dont fix it. The cam gear had three teeth that were worn so that has to go and i have the new chain. I have a circle mark on the cam gear and i can find top dead center with the flywheel and my dial indicator. I am wondering where i can time the cam to? I think i see a mark on the head but i have also heard that you need to just line up all marks straight up. When i got home tonight i was going to just pull the cam adjuster caps off to look at the lobe but i want to be a little more scientific than that. Any help would be greatly appreciated. I am an experienced engine builder but for some reason this one is not intuitive to me. Thanks in advance. --Biff Quote Link to comment Share on other sites More sharing options...
brian r Posted July 11, 2007 Report Share Posted July 11, 2007 Hi Biff. It just goes straight up. You might see a little notch like thing on the part that the cam cover goes on. The flywheel will have a mark on it to line up with the case. Get it on TDC and take a look. 0 on the top of the cam sprocket. Pay attention to the way the chain tensioner works, it's counter intuitive. Quote Link to comment Share on other sites More sharing options...
brian r Posted July 11, 2007 Report Share Posted July 11, 2007 Did you clean out the oil slinger while you had it apart? Quote Link to comment Share on other sites More sharing options...
malcra Posted July 11, 2007 Report Share Posted July 11, 2007 with the TL125's, it is _possible_ to get the timing 180 degrees out 1. Get the flywheel on the "T" mark, making sure you hold the camchain up so it binds with the teeth when you rotate the flywheel 2. Set the camshaft so that the cam lobes are pointing up, ie they are in contact with the rocker arms (you should loosen the valve clearance adjusters to take off the strain) 3. take the mark from the camshaft sproken (an "o" normally and align it with the mark on the cylinfer head) run it over by hand. The Clymer manual for this bike (and the other Honda singles) goes through this pretty well Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted July 12, 2007 Author Report Share Posted July 12, 2007 Excellent. Thanks guys. I did clean out the oil slinger. I had metal in the filter screen from the bushing that had failed on the output shaft. This was the gear on the shaft that mates up wiht the kick starter gear. It seems as if the gasket failed in the case halfs and instead of draining down into this bushing it was bypassing. I got a bushing from a donor cr80 that i was junking and I am proper through the whole case with new gaskets and every thing. Yesterday i loosened up the rocker arms and also spun the cam by it self to do a non evasive inspection of the cam gear bushing. It seems to be ok. I am giong to keep this thing stock for this summer. This winter i am sending the jug and head to B&J to have him put in the 150 kit and have him go through the head bushings. I wont compete on it untill thats done. The guy who owned this used it as a trail bike. The exhaust was rusty but it does not even look as if the thing had been on its side. The oil had tons of fuel in it so i am chalking up the failure to lack of maintance. I have replaced all of the case bolts with 8mm's to get rid of those silly phillips heads. The cr 80 shift lever mounts right up too and its a flip back type so i ditched the oem shifter for the more trials friendly version. I see what you mean about counter intuitive. It seems if you back it out it should tighten but thats not the case. I discovered that upon tear down. I should have this at mid ohio as a pit bike. Look for the only repsol colored tl125. --Biff Quote Link to comment Share on other sites More sharing options...
brian r Posted July 12, 2007 Report Share Posted July 12, 2007 Hey Biff, Don't ship the motor to Bob, bring it to him and ride with us! If I can get my TL motor in you can ride the Beta. Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted July 16, 2007 Author Report Share Posted July 16, 2007 I might just do that Brian. I can bring down the gasgas and one of dads greeves. This winter i intend to make several trips south. Last winter i became fat dumb and happy. --Biff Quote Link to comment Share on other sites More sharing options...
zippy Posted July 17, 2007 Report Share Posted July 17, 2007 And exactly what is wrong with being fat, dumb, and happy. I'm thinking of taking it up full time. Can't wait to hear and see that thing running, Can I take it for a spin?????? Quote Link to comment Share on other sites More sharing options...
biffsgasgas Posted July 17, 2007 Author Report Share Posted July 17, 2007 Sure zippy no problem. You let me put a dent in the tank of the repsol-reflex so I owe you a good crash on the repsol-tl125 hahahaha. --Biff Quote Link to comment Share on other sites More sharing options...
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