help- problems starting my bike

[Gaz92]

okay so my bike (yamaha sr125 ) has been sat for 6 months. i got it back out and it wouldnt start. so i put new oil and fuel in it, which got it starting, but wouldnt tick over if i wasnt reving it .

so i posted on here for help and some guy told me to rev it full for 2mins and then rev it half for 2mins.
as i was reving it full for 2 mins the bike cut out with a load bang, and since then i cant get it started at all

ive put a new spark plug on the bike, cleaned the air filter, cleaned the carb and still not making any appemt to start.

if i try jumping start it, then you can hear the motor starting to tick over and it backfires, but no power at all

any suggestions, or shall i just take it to a garage

[CaNsA]

Cleaned the spark plug?
Fresh battery?

[Gaz92]

New spark plug and I charged the battery

[bladerunner]

Erm......when you say rev it full for 2 minutes......just what exactly did you do?
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[Gaz92]

Umm started the bike . Reved it a little, then full throttled for almost 2 mins. Then made a load bang and cut out

[SQL]

[TheSmiler]

[Gaz92]

Lol some tool on here told me to full rev it. Is that what it's meant to look like in the picture

[Gaz92]

Don't I need to be able to start the bike to be enable to do a compression test

[TheSmiler]

[Gaz92]

Lol didn't look that close at the picture. So if mines fucked it will have a crack in it ? Sorry this is my first bike and don't really know much

[SQL]

[bladerunner]

Oh be jeezus I hope this is a wind up! Or I'd be tempted to hit whoever gave you that advice in the head with a base ball bat repeatedly for 2 minutes,then beat yourself in the head with it for the next 2 at half strength for actually doing it!

Failing that...give the bike to someone who knows what they are doing to fix!
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[caferacer]

Just how loud was the bang?

They can misfire when they cant draw enough fuel into the engine...

If you're lucky it could still be a fuelling problem.

Revving it high is very different to on the limiter for 2 minutes...

[caferacer]

Also, a good reminder that you can't trust every word of advice on forums...

[Gaz92]

It was really load bang.
Now when I try to push start it, you can hear the engine almost starting and a few little bangs ( more like pops)

[edb]

[Gaz92]

No. I posted a thread like a month ago when my bike was working but wouldn't tick over

[iooi]

[lihp]

[Gaz92]

Ooo my bad I did miss read that at the time. Sorry my bad.
Well anyway I did full throttle for 2 mins instead of full Choke lol

[caferacer]

[lihp]

Did it sound like a mechanical bang, a noise of stuff hitting each other.

Or did it sound more like an explosion bang?

[Gaz92]

Explosion bang

[gavcarter]

grab a cheap compression tester, take spark plug out and put compression tester in. FULL THROTTLE - NO CHOKE and try and start bike for about 5 seconds.
The compression tester will now have a reading, which you should be hoping is good