Need Help... Trouble Starting CPI SM50

[cmk661]

Nope i never left the choke on. it has an automatic choke. Cheers for your input tho
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2003 Aprilia Mx50
2008 CPI sm50

[joop200789]

are sm's geared,if so you had go at bump starting it,
it always seem bump starting works better when it been a pain to start,
but that might just be me lol

[cmk661]

yeh ive tried bump starting it. No joy though.
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2003 Aprilia Mx50
2008 CPI sm50

[cmk661]

just one more thing.... A few of my dads mates are bikers. they say that it could be my jets. they said that when you replace your jets you must count how many turns it takes for you to get your jet out and that when you put the jet back in you must do the same amount of turns. or you can count the threads and when putting back in count how many threads. is this true?
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2003 Aprilia Mx50
2008 CPI sm50

[tutton]

never heard of that before, usually just screw the jets all the way back in.
Wouldnt really be expecting a new 50 to have jets falling out but it is possible, there is more likelyhood of a blocked jet from shit fuel than the jet being out id of thought.
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[sumpgard]

what colour was the plug when you took it out have had a similar problem with a friends bike turned out to be the jetting i dropped the needle by moving the clip up 2 notches starts first kick with no choke even when cold this problem has had many people confused we dont know why this happened but the bike runs fine now.

[cmk661]

[sumpgard]

the one on the needle thats inside to the throttle slide if your plugs black this means your bike will be running rich by ajusting the needle this will weaken the fuel air mixture after doing this you must check the colour of the plug if your bike runs week you will seize the engine your plug needs to be a sandy colour when the bike has been taken for a short run i hope this helps.

[tutton]

Was it black wet, or black sooty/carbony?
I really wouldnt expect a 08 bike to have the jetting wrong already, as youve tried with the previous exhaust too and no one has rejetted it..
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[cmk661]

black wet. yeh i woulndt have thought the jettings wrong.
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2003 Aprilia Mx50
2008 CPI sm50

[Ichy]

Sounds like the choke might be stuck on or the airbox is blocked. Change the plug and see what happens.
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https://www.metacafe.com/watch/1972097/how_to_behave_on_a_forum/

[TAX MY BRAIN]

2 stroke ??
correct oil petrol mix , if there is a seperate oil tank is there to much oil getting in,
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i also ride the local bike.............she's like a moped great fun to ride as long as your friends dont see you !!

[cmk661]

Its an automatic choke. Does anyone know how they work?
Ive changed the plug aswell.

Yup its a got a seperate 2 stroke tank. Its only got 254 miles on it so i dont think the mix is wrong. how do you adjust the mix?



Cheers
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2003 Aprilia Mx50
2008 CPI sm50

[MarJay]

[adamcpi50sx08]

[tutton]

[adamcpi50sx08]

no the guy who seized his topend by running a technigas enox while it was too lean is also called adam tho or is it aaron lol but his is exactly the same as mine just his in a sm and no mine has never been seized or partly seized...touch wood lol
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CR 125 (OFFROADER) - DEP PIPE ETC
CPI 50 SX 2008 - NO MODS YET EXCEPT FROM A SET OF ACERBIS HANDGUARDS

[davthegreat]

ok, well to start of ive got the same problem my bikes seized and i managed to free it up but now it wont start i thought it had siezed due to oil starvation so i put a half a pint or so with some petrol shaked it up and then put it in the tank to make sure, ive lost compression and it wont kick start ive tryed bump starting it, but it starts in 1st then you can run it but it defo wont idle and when you put it in neutral it dies. not sure whats wrong with mine either but i thought it was the same sort of problem so i posted mine on this one to find out the overall problem im gonna check my fuel lines tomos to make sure

[davthegreat]

if i manage to find the problem on mine ill post it if it helps you if i cant fix mine i might make my own thread to see if anyone can help

[tutton]

If youve lost alot of compression/got not much
its top end off time.
and if if siezed dont try unseize it and ride it you plum.
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[davthegreat]

its already unseized, i wouldnt of as ive read on here it can do more harm than good but i was 2 miles from my house and it seized so i rang my parents to come and pick me up like quick cos i had an exam and had to go then otherwise i would of missed it so my brother walked it home and decided to unseize it so you know thats what happerned. But anyways my dad recons a seal could of moved so he recons i should get it running so it might move the seal back therefor it being ok but he did say theres a slim chance

[tutton]

Your dads wrong,
a seal being out of place wont lock the rear wheel up.
If that were the case when you "unseized it" you'd of had to move the seal, but thats not the case its seized, and needs a top end rebuild mainly because youve lost loads of compression along with seizure syptoms hence not a seal.
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Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[davthegreat]

ok do you recon it needs a top end re build then, whats that include or do, is it easy, will it cost alot, is it defo top end cos ive heard people starting bikes with there little fingers sort of thing

[davthegreat]

he doesnt think it seized because of the seal moving he recons thats to do with lack of oil or got to hot to quick (overreved) he recons the seal could of moved during or because of seizure

thanks for the help btw

[sumpgard]

if you have seized your bike it will need atop end rebuild could be just a piston and rings or a rebore or the crank rebuilt you will not know untill i has been taken apart also find out why it seized in the first place.