Hello! So I bought a chinese YD100 kit from a german seller. Anyways i installed it onto my frame and tried to start it... I spend about 30 minutes trying to start it. Was checking if it was getting fuel, if the plug was wet all those things. It was backfiring like crazy at first. After about 30 minutes it started but would not idle. After about 15 more minutes of trying i got it to idle but the throttle response was non-existent. Again after about 15 more minutes it started responding to my throttle inputs. Tried to ride it and it bogs down when i get it going. I let it run for 15 minutes and rode it on a flat road for about 30 minutes but when i came to a hill i wanted to die so i had to pedal with it. Is it normal that it has no power at all while in break in. Before putting the engine on the frame i checked all of the bolts and such and i found out that it had no gasket between the cylinder and the case (it has a 1 piece cylinder and head). I made my own out of gasket paper. There are no obvious air leaks. The needle pin is set on the 3rd groove from the bottom. Should i try tweaking with the carb first? Thanks in advance!
Break In Chinese YD100 no power
- Thread starter MinimumVK
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Most needle valves have 5 positions...Your at an elevation where the middle position would be Ideal for most situations, make sure that during the first two gas tanks of gas/oil mix that you are running a ratio of 25:1..25 parts gasoline/petrol to each 1 part of two cycle oil.
Once you have run through two tank fulls, change the gas/oil ratio to 32:1.
Here is a picture of the needle valve and C clip that holds it in appropriate position...Choose the middle position for now and see how it runs...Remember the fact that it will run better once it has been broken in after the first two tank fulls.
GW's Motorized
Well-Known Member
Like Damien said, put it to the middle and see how it runs. If it runs worse, put it back
GW's Motorized
Well-Known Member
NGK plugs make these little engines run like a dream. If you have a tool bag on your bike I suggest putting a spare plug in it. It would suck to do the walk of shame due to a fouled plug.
Very smart move to trash that Chinese junk spark plug for a good NGK.
GW's Motorized
Well-Known Member
That was my first ride on my bike, to the NAPA to get an ngk
The seller somehow agreed to send me a new kit. I send them pictures of everything i had to do to get the motor running. So now i will start making my 2nd build which is nice. Im curious if it will come with the cylinder base gasket or if all of their motors have an issue.
GW's Motorized
Well-Known Member
That's cool. I should have bs'd my engine not working so I could have 2 bikes... lol
GW's Motorized
Well-Known Member
Not that you bs'd your bike not working
Nate82
Active Member
I wonder how OP's motor worked out.... sounds like he got it running but it was still in break-in. Wondering how it's running at this point... someday I'll be going with the YD100 and trying that block out...
I'm really interested in the elevation and c-clip placement on the needle. I too am right in the middle on my NT carby and I'm about 100 to 500 ft above sea level.
I see they got a version 2 out now where it's not a one-piece jug but rather has a head that can separate from the cylinder.
I'm really interested in the elevation and c-clip placement on the needle. I too am right in the middle on my NT carby and I'm about 100 to 500 ft above sea level.
I see they got a version 2 out now where it's not a one-piece jug but rather has a head that can separate from the cylinder.
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