FCR-MX 39 starting problem
- Thread starter threedigits
- Start date
^^this happened to me.
The hot lead to the starter was degraded and just 1 strand of wire was attached to the ring terminal.
Joined Sep 2016
29 Posts | 0+
Finland
Well, I'm in the middle of making new wires just in case, nothing to lose. They do look very degraded, but a tester shows they are ok.
Never know if the crank bearings are wearing themselves out but I still don't believe it would it would not crank the engine. It kickstarts very easy.
Never know if the crank bearings are wearing themselves out but I still don't believe it would it would not crank the engine. It kickstarts very easy.
Joined Sep 2016
29 Posts | 0+
Finland
I made all new wires just in case. It did not help, but thanks for the advice. They did seem to be heading towards the end of their lifespan but they were still complete and working.
Now when I've tried everything, there is no choice but to hope that a new auto decomp spring will do it.
Joined Sep 2016
29 Posts | 0+
Finland
I did check my valves again, and there was something fishy going on.
My exhaust valve clearance was HUGE. After re-adjusting, the flat screw is way deeper inside the locknut than before and compared to the intake valves. This worries me. Makes me think if my valves are not seated properly.
My exhaust valve clearance was HUGE. After re-adjusting, the flat screw is way deeper inside the locknut than before and compared to the intake valves. This worries me. Makes me think if my valves are not seated properly.
Joined Nov 2001
17K Posts | 774+
Ely, England
bent valves effectively sit the valve further away from their seats. the way to tell is simply to take the headers off and with the engine at TDC on the comp stroke just poor some white spirit down an exhaust port. doesn't have to be a lot!
could you have been sold shorter valves are valves bigger than the 30mm you required?
regards
Taffy
could you have been sold shorter valves are valves bigger than the 30mm you required?
regards
Taffy
Joined Sep 2016
29 Posts | 0+
Finland
I always have done the valve adjustment at TDC-C, that is why I'm confused. Never had this before, and I've done the operation countless times.
I need to take a closer look, something is wrong. Taffy, I will do something like that to find out if it is bent. The valves are the same when I bought this bike, so I don't know the specs. I ordered some gaskets from Taffy too to play around with.
I need to take a closer look, something is wrong. Taffy, I will do something like that to find out if it is bent. The valves are the same when I bought this bike, so I don't know the specs. I ordered some gaskets from Taffy too to play around with.
Joined Sep 2016
29 Posts | 0+
Finland
I'm actually considering taking the whole head off and see everything is okay. It's not a bad idea since it has been unopened for years, so before it blows the whole engine if something is wrong with the head, timing chain etc.
Maybe take it to a bikeshop if it seems bad.
Maybe take it to a bikeshop if it seems bad.
Joined Nov 2001
17K Posts | 774+
Ely, England
the 450s are dropping the heads off the exhausdt valves or the single valve springs are breaking. peple cheapskate and fit only one new exhaust valve and so the other head falls off! it is the fault of the "percussion" from the single valve springs and only happens to the 450. not even one 550 or 650 so it is revs related as well.
not to say it is this but so that others change their exhaust valves and their springs soon enough. I have two blown 450 ewngines here now and what with some liner and jetting troubles I am sick 'n tired at the mo with 450s....
I'll get over it....
Taffy
not to say it is this but so that others change their exhaust valves and their springs soon enough. I have two blown 450 ewngines here now and what with some liner and jetting troubles I am sick 'n tired at the mo with 450s....
I'll get over it....
Taffy
Joined Sep 2016
29 Posts | 0+
Finland
Thanks Taffy, good to know. I think I hassled last time to put back the valve cover. I will take a real deep look inside the valves and springs next week and see for anything you suggested.
Joined Sep 2016
29 Posts | 0+
Finland
It all feels funny afterwards, but now that I took apart the valvecover, I found 2-3mm clap in my exhaust cam follower bearing. There's my problem. I missed it earlier.
Is it difficult to change ? The bearing itself is quite expensive but no options.
Is it difficult to change ? The bearing itself is quite expensive but no options.
Joined Sep 2016
29 Posts | 0+
Finland
Thanx I tried to remove the old according to advices but the pin was so worn out a needle bearing got stuck immediately in between that the rocker arm went to the bin. I did't find a good way for this to not happen, a feeler did't help. Have to really congratulate myself but lesson learned.
Inlet bearing came off easy, since the pin was 2mm less worn
Inlet bearing came off easy, since the pin was 2mm less worn
Joined Sep 2016
29 Posts | 0+
Finland
Thanks for all the help I've received guys. And thanks Taffmeisters for parts supply. Just got the bike all ready and fired up. Seems to work well, cranks like a dream with the starter. Just need to get some miles on it and keep cautious for a while, look out for leaks n stuff.
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