Help Yamaha Ybr stripped screws

[zucarides]

Hi
Apologies for signing up just to get some help

Here's my situation: newbie with a ybr 125 2016.
Was happily riding when the engine seized, fortunately at 30mps with no damage. The problem: chain came out the front sprocket. I called roadside assistance and turns out the previous owner had stripped the screws from the cover. They couldn't help...


Hindsight is great and I should've changed the chain and sprockets as soon as i got the bike. Now the only garage I trust in the area is fully booked for a month, and I either catch the bus like a sucker, or try some DIY

I already have the replacement chain kit.

Would you recommend sawing the screws, cutting them with one of those disk cutters, or leaving it to a professional?

Thanks

[Nobby the Bastard]

I'd be more concerned with the seized engine...
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[zucarides]

I had to give it a running start first, but now electric works fine and revves through all the gears with no weird noises. Fair won't know for sure until I sort the chain

[talkToTheHat]

Consult professional. When this happend to a friend I got a call asking me to have a look because he thought the chain had come off and jammed the sprocket (which to be fair happened on the R125 he had before that thing) and well, a siezed engine is likely more than some bolt on parts to replace. That it's been worked on badly before is a bad sign, you might find some kind of epic bodge.
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Bandit. does. everything.

[zucarides]

I have nothing to loose by removing the front sprocket cover, except the cost of a few screws

[Nobby the Bastard]

If the starter wasn't man enough to start it before but now does after seizing it, it points at a massive reduction in compression.

Before you do anything with this bike, check the compression. And i don't mean by the chav pathetic way by sticking your thumb over the spark plug hole, you need about 150 psi or more.
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[zucarides]

I have no idea how to do that

If it were an engine problem, shouldn't the diagnostic light be shining?

[Nobby the Bastard]

[The Shaggy D.A.]

[zucarides]

[The Shaggy D.A.]

[WD Forte]

I swapped engines on a 2011 YBR125 a little while ago and if I recall correctly those sprocket cover screws arent that meaty.
If they've been rounded off, my first method would be to use a 6mm drill to remove the heads* whip off the sprocket cover, then use mole/vise grips to remove what's left.
( MIG a nut on if forced to)
They run in alloy so hopefully shoudln't be that hard to get out.

All this on the assumption the Ops 'seized' is just loss of forward motion due to the chain jumping off.

* start with touching an 8-10mm in to create a shallow dish shape and remove the jaggy bits
____________________
bikers smell of wee

[zucarides]

Finally managed to get those damn screws off. The front sprocket has a broken tooth and spins freely without the chain in neutral.

Whenever I bring it to first or second the engine warning signs lights up and kills the engine.
Is this by design because it's not feeling the resistance from the chain, or am I fucked?

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[zucarides]

Nevermind the side stand was out. It's working beautifully, just need to change the chain and sprockets. Can't wait to ride my bike again!

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