Ybr 125 wont start

[taylor2081]

Sorry if this already posted, new here.

Hi I bought this bike a few month ago as a non runner, there was nothing coming from the starter motor so just got a new one and now that works but only if I bypass the solenoid, so I need a new one of those, my question is that when I try to start it it's not firing, I'm getting a spark and i have also took the exhaust off and when I'm going to start it, fire comes out of there but bike wont start, the starter motor makes a noise and you can see the crank moving but just not firing need help as its baffling me. Will post video if I can.
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L.taylor

[Evil Hans]

What year? Fuel injection or carb?

Did you drain the old fuel and put in some fresh?
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Triumph Sprint ST 1050. And it's Red.

[taylor2081]

Hi its 2010, fuel injection, no never drained old fuel.
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L.taylor

[jeffyjeff]

[taylor2081]

I tried to post video but couldn't.i am new to bikes I normally fix my car, how would I go about checking and adjusting the valve clearance. Also I did pour little bit of petrol in the spark plug hole so that might be the reason for the flames. Hopefully. Also the lad who I bought it off said he changed the top end and didnt have a clue so he said timing could be out if that helps.
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L.taylor

[Nobby the Bastard]

Oh god.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Nobby the Bastard]

Okay. A more reasoned response.

Ybr's look to be screw and locknut for valves. Typically these end up with too big a gap over time so its difficult to see it getting too tight and causing flames.

Finding g out where the timing marks are for the cam chain and how to set the valve gap can easily be found on the Internet so im not going to bother.

There are videos on YouTube showing exactly how to do it.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[taylor2081]

Thank you for your response, I have found a video on how to do it. Its 0.5 in and 0.10 out, exhaust. Will have a go tomorrow see how it goes.
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L.taylor

[oilyrag]

Does sound like the timing is off or a valve is bent

[jeffyjeff]

[taylor2081]

Yes they were way off and I mean way off, either he didnt set them right or like you say I have a bent valve
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L.taylor

[taylor2081]

Is there any were on here that explains how to do the timing correctly.
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L.taylor

[Nobby the Bastard]

Google is your friend.

Or apparently not in your case. I found a YouTube video in 5 seconds showing how to check it.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[jeffyjeff]

[WD Forte]

Burn it! send it to .....
oh never mind, better not

Pouring petrol down the plug hole on a bike is kinda desperate and often pointless.
What do you think will it do on a fuel injected one?, kickstart the ECU?
It wont help ok?
Mind you to be fair it has shown the plug is sparking I spose.

The link to the ybr blog jeffy posted is a pretty good resource
so leave the bike alone until you've done some reading then
have another go but try and take a more systematic approach.

Check the valve timing first then the clearances before you try and
start it

Can you hear the fuel pump spin up when you turn it on?
does the yellow engine light come on them go out after a few seconds?
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bikers smell of wee

[oilyrag]

If you put some fuel directly into the cylinder and it fires and runs for a few seconds it proves you have compression, timing, air, spark and the problem is lack of fuel but apart from that it's pointless.

In this case trying to start it was a stupid thing to do because the guy that sold it to him told him that he took the head off and probably got the timing wrong. If you know that the timing is probably wrong why are you trying to start it without checking timing?

I'm guessing you're young and this is your first bike? Take it as a learning lesson. "Buying a bike when you should walk away". Now you're stuck with someone else's pile of crap. We've all done it.

With a bit of luck you will put the timing right and adjust the valve clearance and all will be well. But if it still runs badly after doing that you could have serious engine damage. And you have to ask yourself why did the last guy change the head in the first place? Has he run it out of oil? The timing might not be the only problem, the whole engine could be junk, you won't know until you hear it run properly. Hopefully you didn't pay much for it.

[taylor2081]

So I decided to take it all to bits and start fresh. I took the top off and the valve that goes to carb does not close properly, so that must be bent, the tapers were way out as I used my gauge and 60 would go in twice.also the chain tensioner only had one bolt in as the other side was broke off and the bit was stuck inside the tensioner so couldn't tighten it up, another thing I noticed was there were 4 bolts through the top and 2 had washers, and only 1 bolt holding the middle casing for piston. So need to get a new top head, new tensioner and another bolt. Before I can do anything else. Also when I turned the flywheel is the crank gear supposed to turn as it turned then stopped but the fly wheel kept turning. I put the flywheel so the 2nd mark joined up when you look through the little hole and the piston was right to the top, and then the crank gear so both the Mark's joined up is this correct, then I will set the tapers. Is this how to do the timing. First bike so wanting to learn.
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L.taylor

[taylor2081]

The other owner left all his bits in the back and it looks like he broke a valve as theres only one so that could be why he did it, hopefully, paid 300 for it,
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L.taylor

[Nobby the Bastard]

Depending on how fast the engine was running when the valve got bent, there could be damage to the piston and conrod.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Ste]

Where did you buy the bike from and have you got a link to the advert?

[oilyrag]

Sounds like the last guy fucked the engine. What condition is the rest of the bike in?

If the rest is in good condition I'd be thinking buy a good used engine and swap it in.There's a few low mileage engines on ebay.

If the rest of the bike is in poor condition I'd just cut my losses and sell the lot as parts.

[Ste]

[jeffyjeff]

[taylor2081]

Ok thankyou well this is turning out to be a project for me, not a bad way to learn I suppose.
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L.taylor

[Ste]