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September 11th, 2016, 09:00 AM   #1
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FCR-MX 39 starting problem

Bike is FS 450E 2005 model with an FCR-MX 39 carburettor.

I had driven the bike working perfectly normal the day before, and it started like a charm and has done so for 3 years regardless of the weather or temperature (above 0 Celcius). It has always started at the first crank with e-starter and choke enabled. I only drove for an hour on a paved road with no problems at all.

Nothing had been done or changed to the bike but..
The problem is, suddenly the next day the engine won't crank over and does not start with the choke ENABLED when starting the bike with th e-starter. It really has trouble turning the engine over like it's too strong opponent for the starter, and also makes a loud bang in the pipe after a while of super slow and hard cranking.

But it does crank with the e-starter very well and strongly immediately with the choke disabled, starts with low rpm ofcourse as the engine is still cold, and works well when I enable the choke AFTER the engine is already running. Then the bike works just like always with no problems.

I have charged the battery full and it should be fine. Also changed the spark plug to a brand new one but it made no difference.

Any ideas? Did not find a helpful thread so far.

Last edited by threedigits; September 11th, 2016 at 11:23 AM.
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September 11th, 2016, 11:22 AM   #2
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possibly your PJ is blocked. tight valves.

look into the carb.

Taffy
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September 11th, 2016, 11:58 AM   #3
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Originally Posted by Taffy View Post
possibly your PJ is blocked. tight valves.

look into the carb.

Taffy
Edit: obviously you mean the Pilot Jet ? Howy can it prevent the engine from being able to crank?

Thanks Taffy !

Last edited by threedigits; September 11th, 2016 at 12:06 PM.
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September 11th, 2016, 11:20 PM   #4
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you may also find tight tappets. try and get the staple on the ignition flywheel to 9 o clock on the compression stroke and then check your valve clearances. you need what is called "a sixth of a turn". you may find even some damage there, as if something mechanical has broken etc.

to do the PJ on a 450 is a sod. the carb can't really be dragged out of the frame but we do it and have a look at everything while we are there.

regards

Taffy
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September 12th, 2016, 09:44 AM   #5
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Originally Posted by Taffy View Post
you may also find tight tappets. try and get the staple on the ignition flywheel to 9 o clock on the compression stroke and then check your valve clearances. you need what is called "a sixth of a turn". you may find even some damage there, as if something mechanical has broken etc.

to do the PJ on a 450 is a sod. the carb can't really be dragged out of the frame but we do it and have a look at everything while we are there.

regards

Taffy
So today I checked my valves. I did the good old 1/6 turnee and after putting it all back together, the bike fired up like a match.

I repeated the ingnition 4-5 times with the e-starter, choke enabled and it fired up right away every time. I'll try again tomorrow, if it still works I believe I owe you a thank you, Taffy.

Edit: I did not touch my carb and the PJ yet at all. I also bombed around the block with the bike and it worked normally (=kicked ass)

Last edited by threedigits; September 12th, 2016 at 09:52 AM.
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September 12th, 2016, 09:56 AM   #6
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Originally Posted by Taffy View Post
you may also find tight tappets. try and get the staple on the ignition flywheel to 9 o clock on the compression stroke and then check your valve clearances. you need what is called "a sixth of a turn". you may find even some damage there, as if something mechanical has broken etc.

to do the PJ on a 450 is a sod. the carb can't really be dragged out of the frame but we do it and have a look at everything while we are there.

regards

Taffy
I did not get the ignition cover off the engine because it felt so tight from the left down part. Wonder why?

I did the straw in the spark hole -TDC check instead.
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November 28th, 2016, 10:06 AM   #7
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EDIT: altered battery details

So far I have checked my valves, pulled out the carb and given it a good cleaning and replaced my battery ( the old had died while trying to start countless times).

The electric starter just won't work. Kickstarting works like a charm everytime, and the bike runs just like it should. The starter does try but still can't crank the engine over.

I replaced the old battery with a YTZ7S with a more powerful 5,5Ah. The Old YTX5L 4,2Ah worked 3 years with no problems before. No difference - no juice to crank over.

Last edited by threedigits; November 28th, 2016 at 11:44 AM.
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November 29th, 2016, 03:04 AM   #8
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Hi

No juice ?

Check battery cables, replace cables with stronger ones

Check auto decomp spring

Replace starter with Taffy beefy starter


ZAGA
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November 29th, 2016, 06:58 AM   #9
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Replace starter with Taffy beefy starter
i believe the "beefy" starter was meant for the '01-'02 models

Last edited by ned37; November 29th, 2016 at 06:59 AM. Reason: quotes
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November 29th, 2016, 07:18 AM   #10
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Originally Posted by zaga View Post
Hi

No juice ?

Check battery cables, replace cables with stronger ones

Check auto decomp spring

Replace starter with Taffy beefy starter


ZAGA
To check the auto decomp, can I open the valve cover (the whole cover, not the valve clearance check lids) in my 2005 model without any huge problems? Is it just a matter of taking it off, or does for example the camshaft come loose or something?
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