50cc tgb 101r new piston new cylinder and wont start

gauka · L Plate Warrior Joined: 18 Aug 2015 Karma :

hi there i need help

i have replaced crankshaft, new cylinder and also new piston

inject the petrol under the spark plug and the bu.... still wont start

the exhaust been taken off , have no idea what that could be

compression around 97 - according to manual is ok

thanks for suggestions

Regards

Lukas

skyebiker · Derestricted Danger Joined: 11 Jul 2015 Karma :

have you checked your getting a spark from the spark plug ?, also something i learned is make sure the stand isen't on or you won't get a spark what so ever

gauka · L Plate Warrior Joined: 18 Aug 2015 Karma :

It has spark well don't know if is good enough is blue but not fat I would say, that's my problem, I wonder if is cdi unit I also have noticed there is a marking line and dot on fly well that I can't match up is that matter or is for torque ?

skyebiker · Derestricted Danger Joined: 11 Jul 2015 Karma :

it could be but i don't know how to do the timing on a bike only a car. see if youtube can show you how to do timing, if your getting spark, and your getting fuel, and its timed up correctly it should fire as the CDI box tells the spark plug when to fire but if your timing is out then it will be sparking at the wrong time

gauka · L Plate Warrior Joined: 18 Aug 2015 Karma :

I will do thank you

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

I assume this is some kind of cheap far eastern scooter. I also assume it is a 2 stroke.

You have a spark. Assuming a CDI type set-up, it's hard to get the ignition timing wrong, and the fact that you have a spark means all of the bits fo ignition are there. We can ignore spark for now.

You mentioned the exhaust being removed. Don't try to start an engine before putting it all together. Put the exhaust back on.

At this point you should have an engine that is bolted together, compression, and a spark. The only thing left is fuel/air, in the correct ratio.

Make sure you have fuel to the carb. Make sure the carb is clean internally and set to standard factory settings. If the 2 stroke oil line hooks into the carb, make sure it is hooked in and has oil in.

Now crank it until it starts.

gauka · L Plate Warrior Joined: 18 Aug 2015 Karma :

hi thanks for reply

i have had all put back together before and did not start.

so i have taken every think apart and put together one more time in

case i forgot to do something, however i have not noticed anything.

it is far east scooter and it is 2 stroke engine so is simple like a Lego

well scooter have started after 10 min of cranking for 3 sek and the

engine was hot but that all i cant start him anymore ;(