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October 20th, 2021, 10:53 PM   #1
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Fe450 engine stuck?

Hello. I just got my first husa like a month ago. It was running fine, expect little noise at the idle rpm. Didnt wonder about it too much. Then the bike got engine stuck while driving with full throttle. Got it home and opened the clutch side. The timing chain was loose.

Got the chain replaced recently and bike was working fine. Then same happened again. Engine stuck from the full throttle. Opened it again and everything seems to be okay and i got the engine turning by turning it backwards a little bit.

The problem now is it gets stuck time to time and starts to spin again when turned backwards, but cant get it to run. When i try to kick it, it feels like sticky.
Also noticed the balancer is the one that gets stuck. If i get the piston down and try to turn balancer, it will get stuck at some point and start to spin again when turned enough backwards. Anyone have any idea whats broken? I have youtube link to the video about the problem, if that helps.

Would like to know what parts to get before tearing it completely down.

https://m.youtube.com/shorts/vnBqmoGQ8IQ?feature=share
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October 21st, 2021, 12:00 AM   #2
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From the video I would say it's your connection rod or crank bearings

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October 21st, 2021, 12:18 AM   #3
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I wouldnt say its connection rod.

In the video clutch wasnt connected so i wasnt even turning crankshaft? So its not rod? I tried to feel if the bearings are any loose but didnt feel anything. It also spins ok till some point it just wouldnt move.

Any idea where that klok klok sound comes from?
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October 21st, 2021, 05:53 AM   #4
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I'd tear the engine apart checking everything properly. Bearings/ shaft warpage/cracks and tolerances.

If I understand what happened correctly the engine not only stalled but locked up at full throttle?

This would definitely require a complete disassembly to mitigate any risk of future failure, and im guessing you got lucky now but you can't just expect to take off the clutch side and replace a chain and think it will be all good.

Take your time and think about WHAT moves/rotates WHAT and you will eventually find out what is wrong.

I'd guess that you have a crank/balancer issue or something in the head as the chain was loose/broken.


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October 21st, 2021, 06:08 AM   #5
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the noise in the video; i wouldn't worry about that. they can all do it. you mnove your hand too quickly but at a guess it is just 0.5mm of "slop" and that is enough for that noise.

everytime you break the cam chain the valves are likely to have hit the piston and be bent. maybe not enough to stop the bike or stop the bike from starting but they WILL be bent.

the reason you can only turn the engine backwards is because the cam chain tensioner blade can flop backwards with the cam chain tensioner unit removed or no cam chain.

it then locks the sprague outsidre gear. In the photo the CCTB is a regular short length and just visible next to the chain. But they are often 20mm longer and fall into the gear. imagine even the blade in the phot swinging backwards. it would still reach the top teeth of the sprague gear.

regards

Taffy
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Fe450 engine stuck?-broken-freewheel-gear.jpg  

Last edited by Taffy; October 21st, 2021 at 06:31 AM.
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October 21st, 2021, 06:11 AM   #6
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Originally Posted by Taffy View Post
the noise in the video; i wouldn't worry about that. they can all do it. you mnove your hand too quickly but at a guess it is just 0.5mm of "slop" and that is enough for that noise.

everytime you break the cam chain the valves are likely to have hit the piston and be bent. maybe not enough to stop the bike or stop the bike from starting but they WILL be bent.

the reason you can only turn the engine backwards is because the cam chain tensioner blade can flop backwards with the cam chain tensioner unit removed or no cam chain.

it then locks the sprague outsidre gear. In the photo the CCTB is a regular short length and just visible next to the chain. But they are often 50mm longer and fall into the gear.

regards

Taffy

Good answer!
Don't know why I didn't think of that too as that's what locked my engine while I was fiddling around with the chain timing..
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October 21st, 2021, 06:43 AM   #7
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Engine didnt just directly get locked, it was stalling and i hitted lower gear to get it run and then it got stuck. Gears work very good tho.

The chain didnt snap or anything, it was just loose. I worked fine with it, but i decided to change it anyways because the tensioner was at the max.

And it worked fine after as i said. Cylinder has pressure etc. So i bet my valves are also good. Blade isnt either hitting the sprague and the problem stays even if i take the sprague off. What kind of system the balancer has inside of the crankcase? Is there any stuff that can be dropped down and that locks the axle eventually?

Last edited by Jimppaa; October 21st, 2021 at 06:45 AM.
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October 21st, 2021, 09:01 AM   #8
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Here i have better video of the problem. Sometime it spins easily and sometime its tight, spins with wrench tho. And im not spinning it that much so no, its not trying to open valves. Shouldnt this spin freely? So can i guess the bearing is blown or so?

(H) ttps://youtube.com/shorts/daUdaUY81GI?feature=share

Last edited by Jimppaa; October 21st, 2021 at 03:02 PM. Reason: Dont know if the video works for others
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October 23rd, 2021, 01:48 AM   #9
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Okay i took it apart. As i guess, i have some broken bearings. Now the problem is i dont know what bearings i need. Would be nice if i could get those from some local store so i dont have to wait for the shipping.
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Fe450 engine stuck?-snapchat-806092164.jpg   Fe450 engine stuck?-snapchat-1335930898.jpg   Fe450 engine stuck?-20211023_113755.jpg  
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October 23rd, 2021, 08:58 PM   #10
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See if you can find a number on the bearing should be able to buy it on line if’s it’s still made. Or if you close enough to a Bearing agency store
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