It wont start

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

Hi i have a sukida sk50qt-11a 50cc moped and it will not start i have checked everything, it has fuel, the spark plug sparks but it just doesnt wanna start and everytime i try to start it it blows air out of the air filter pipe.

can anyone help me??

thanks
Matt

MyCarVsYourHe... · Nova Slayer Joined: 27 Mar 2012 Karma :

Has this problem started suddenly, or has is been a progressive issue? try taking the air filter off and blocking the air intake on the carb with your hand to manually choke it, if that doesn't work I'd move onto removing + cleaning the carb/jets.

bikenut · World Chat Champion Joined: 21 Nov 2011 Karma :

hi dude,

some pics of the bike please, showing engine, carb, end of exhaust and sparkplug.

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

Hi, (matts dad here) lol
well it seems the bike won`t start due to a what seems like a bent inlet valve (top one) turn the engine over by hand with kick start slowly and rocker pushes down valve but when its on the return ie the cam is bottom side of the cam lobe valve will not return untill piston knocks valve back up, now this rectified it self yesterday afternoon and the engine started and run, matt was happy even went off on his travels only to brake down a few miles away and had to walk the bike home, so my question is if this is a bent valve would it not be like this all the time? not rectify its self or has the valve turned around and its not right,i have not worked on bike engines before only cars but im guessing they both same?

https://a4.sphotos.ak.fbcdn.net/hphotos-ak-prn1/532976_10150817062553048_720403047_9810151_2032170876_n.jpg
pic of gap between valve and rocker.

Usher4566 · Spanner Monkey Joined: 29 Apr 2011 Karma :

That's a bloody big gap considering I've just done my valves and gap on mine should be 0.05 not even a mm
____________________
New cd200 benly owner

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

Taught2BCauti... · World Chat Champion Joined: 12 Jan 2012 Karma :

Its possible that the valve is damaged in such a way that it jams in one position and is free in another - i.e. when it rotates in the valve guide.

Running the engine like this will run the risk of the valve snapping and doing more extensive damage inside the cylinder, so best to have the head off as soon as possible and assess what needs to be done.
____________________
Honda Varadero XL125(V8)
www.TheFutureIsHere.eu

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

Hi ya, matt`s dad here again lol,

have removed head to find a bent valve but no marks on piston which is good, when i removed the valve stem seal i found this,
is the head finished or can it be saved?

https://a3.sphotos.ak.fbcdn.net/hphotos-ak-ash3/552980_10150829208533048_720403047_9816143_1573427016_n.jpg

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

well i have to say you lost me,lol okies ill see if ebay got cheep one, cheers tef. Shocked

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

From another post:-

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

fuel problem was sorted with a brand new carb £27 Very Happy

was running very well till last week when the spark plug decided to remove its self from cylinder head,but other then that bike was doing fine. tho i have to say tef it don`t go as fast as his 250cc Yamaha at imps and he misses jumping over his team mates,lol not somthing id try on a 50cc Laughing

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

Coming from school boy trials, presented with a cone slalom on my 'Part One', and limited steering lock, I did the OBVIOUSE thing.... I did it on the back wheel!

Gained me a round of applause, the congratualtions of the examiner and a FAIL!

I have images of him, attending modern tests, told, "Yeah, they're a bugga, not like my day when bloke just watched y' wobble round t'block... make you jump through oops they duz these days, the' doo!"

Coming back all perplexed... "Well I couldn't find any hoops Dad.... so While I was waiting for the examiner.... I set some up...... I was JUST setting fire to them...... And no! I didn't even get to take the test!

Some bloke came running out the test office with a fire extinguisher, then three fire tenders turned up, and NEXT think I know, I had a GUN to my head, and was being 'Detained' under 'Terrorism' act!
____________________
My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

well bough my boy a brand new head for his bike(£30) starts no prob but there's tones of smoke and very little go had this with the old head to,it only since we changed the oil to service it (should have left well enough alone) im thinking along the lines of piston rings/bore but it happend to quick so any ideas? Rolling Eyes

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

Piston Rings & Bores.
If a ring has snapped, rather than just worn out, it would 'happen quick'. Would also extra phuck the bore!
Back to Riders.... think they do big-bore kits, take them out to 142cc!
____________________
My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

mmulvaney95 · Derestricted Danger Joined: 03 May 2012 Karma :

fraggie · Two Stroke Sniffer Joined: 15 Apr 2012 Karma :