Gilera DNA 50 - 70cc - Problem Occured

[supra3turbo]

So i got a call today from a distressed 16 year old "THE TEMPERATURE HAS GONE OFF THE SCALE AND IT STOPPED DEAD, IT STARTED THEN IT STOPPED AGAIN"

So i got him to get his dad to bring it over to me, instantly noticed that someone had used a copper Central heating coupler to join the coolant pipes together from the radiator to the cylinder head, which had burst apart....

I replaced the pipe completely, got the bike started, but according to him its not right, its not as fast... now i also replaced the carburettor with a spare one, so this could be the issue, Just wanted some re assurance that he's not melted the shit out of my lovely brand new engine, i think he heat seized it twice.... Is this enough to take the edge of the piston rings, or should i percivere tomorrow and do the carburettor, mess with jetting and needle position until i can get it to run perfectly, or is the damage done?

Thanks - Joe
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[Tankie]

It seized ,so i would be looking at the cylinder, piston and rings, not f ing around with anything else , experience tells me you have not got much of a clue
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Always learning, everyday is a school day

[supra3turbo]

I do have a lot of a clue, ive been a mechanic for 17 years, but what i dont have is time, im megga busy right now, replacing the carburettor was simply because the rebuild kit wont be here until next weekend and the one that was on the bike was leaking...
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[Nobby the Bastard]

Yep sounds very much like it seized.
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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

[Tankie]

The world needs more people like you ,it just generates more income for people like me who can do the job properly.
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Always learning, everyday is a school day

[supra3turbo]

Yeah ok then pal, thats your opinion...

Going to have a good look at it today for the poeple who are interested, i KNOW it siezed, twice more than likely but heat siezed, it starts and runs fine, and keeps cool now it has an original hose on, just going to strip and re check everything today, compression test it, jet it again and should be good to go!
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[MarJay]

What is a 'real mechanic' doing asking for advice on an internet forum?
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

[supra3turbo]

Well back when this forum was full of helpful people (mike and snowy) for instance and not full of stuck up ass holes asking pointless questions, and being unhelpfully opinionated it was a nice place to come for re assurance and opinions and help....
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[MarJay]

[Ste]

[supra3turbo]

Yea im fine, just irritated, ive got a great attitude usually, just dont like the assumption im not a mechanic, or havent built loads of 2 strokes, car engines, motorbike engines, tractor engines, dumpertrucks the lot...

So i have stripped the engine again, as i KNEW i would have too but i was trying to avoid it last night i was tired out, it was a long day.

the bike had heat seized twice, as i knew it had, and i knew it had done damage to the piston and barell, Ill hone the barrell as its not nicosil plated, and get a piston, there is scoring, most only minor but there are 2 scores that are deeper than i would like, so a new piston is a must.

Thank you all for your help and sorry for being a bit blunt, its been a tiring week or two

Thanks - Joe
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[Easy-X]

Is this a water cooled 2-stroke with a scooter type CVT?

I'm curious as to how the cooling system could fail so catastrophically and no one noticed but kids today I guess
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[supra3turbo]

Exactly, someone in the past used a central heating pipe coupler which i STUPIDLY left on the bike and didnt replace the nastly silicone aftermarket hoses with standard ones....

He didnt know to keep a constant eye on the temperature gauge, so when the bike stopped he noticed it had gone right up and he brought it to mine.

Such a shame it was doing 57mph this engine, standard variator as far as i can see, just de washered.

It wont happen again, all standard hoses brand new ordered with the correct bends in it, and a new piston, i saved the barrell by 3 arm honing it, didnt take much and its lovely and cross hatched now
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[jeffyjeff]

[supra3turbo]

Thanks for your reply,

Yeah HE was going round, showing the bike off to his mates and going out with his friend with a 70cc Kitted Road Legal Motocross bike of some sort, i made him strip his own bike yesterday, the whole thing, engine out, head and barell off, and showed him the VITAL IMPORTANCE of coolant in an engine, and to ALWAYS look at his temperature gauge, he said "oh so this bit round where the piston goes should be full of water, and the water went away so thats why it stopped" I said "yea thats exactly it, the water around the piston circulates with the water pump constantly pushing it through the radiator and back to keep it cool, when there is no coolant, the engine gets to stratospheric temperatures, the piston expands and heat seized instantly" he said "wait so, no water, the piston was moving at full revs, and it just stopped instantly because it expanded?" i said "exactly, and you did that 3 times, your lucky it didnt damage anything else"

"Ok then, ill keep an eye on my temperature all the time now so i dont do that again"

So i might be getting through to him.... LOL!!

The reason i was spam posting on here was becuase i was at my whits end with the MITHER AND STRESS of a demanding 16 year old who is "bored and notihng else to do, my x box has broken so this is the only fun i have now" sort of constant garbage and mither, so i apologise for replying after getting to stressed out haha

So after ive done this gilera, ive got a stock 50cc one to do, get through the MOT, re build my YZ125 that my friend got on and flattened in 5th gear max revs without warming it up, an RG125 Gamma that im turning into a cafe racer, I re built that engine completely and is ready to go back in the frame, Im making a little 25/50cc quad bike remote control for my friends 2/3 year old as he is scared of pressing the throttle himself, and various other projects, so to say ive got my work cut out is an understatement haha

Thanks again all
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[Fisty]

[supra3turbo]

Is mike still knocking about, and rebuilding a CB125 every 30 seconds?

here is a few pics from today, didnt get much done due to being called into work

thought i might as well post a few pictures of stuff ive got going on, why not

https://photos.app.goo.gl/qyBu8NBjJzsD2ZFg7

https://photos.app.goo.gl/a96CwPMr2vub7Wnr9

https://photos.app.goo.gl/oohnvCoDMEU4asXU9

https://photos.app.goo.gl/BL326tx47GSnSWRw9

https://photos.app.goo.gl/tX3LQD7gERynBredA

https://photos.app.goo.gl/2NmAzNN3P3WQ7hb16

https://photos.app.goo.gl/etzDtwmEwNL5G8YG9

https://photos.app.goo.gl/nVZJ8bJxQgyDqPik8

https://photos.app.goo.gl/ZAbTU1ntMkvQYovXA
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Hoda CBR 600 FX stolen from stalybridge 2017/2018 black
Current Project Suzuki RG125 Cafe Racer

[merquis00]