Engine Trouble Will start for less than 5 seconds

Sentryy

New Member
Joined
Jul 27, 2017
Messages
18
Likes
1
#1
I will start my bike, it will run and keep going slower and slower over 3-5 seconds and get really rough then when I pull the clutch it shut off. What could this be? I just bought it and it's brand new bike. When I got it running, if I pull the clutch or let go of the throttle it will also shut off. Any Ideas
 


RAT RYDER 101

Active Member
Joined
Jul 12, 2017
Messages
165
Likes
60
#2
Supp Sentryy, Watt break-in mix R U using? And are you letting it warm up after it starts? BMW (bicyclemotorworks) has a link to the PDF online to answer all your Qs. Wrench it & ride it, that's what this bike things about.
 
Last edited:

Sentryy

New Member
Joined
Jul 27, 2017
Messages
18
Likes
1
#3
Supp Sentryy, Watt break-in mix R U using? And are you letting it warm up after it starts? BMW (bicyclemotorworks) has a link to the PDF online to answer all your Qs. Wrench it & ride it, that's what this bike things about.
It can't warm up if I can't idle it. Using a 20:1 mix for first gallon of gas. I should also note if I loosen the air hole on the carb it leaks drops of gasoline
 

RAT RYDER 101

Active Member
Joined
Jul 12, 2017
Messages
165
Likes
60
#4
Float might B sticking . If it is, pull the plug & turn the engine over to air out the chamber. The stock jet is most likely a 70. For the N.E. it would B a 65. The screw on the bowl @ the bottom is for draining it out to store it or WORK on it.
 
Last edited:

RAT RYDER 101

Active Member
Joined
Jul 12, 2017
Messages
165
Likes
60
#8
Take the drain screw out- let the gas out- Back off the bolt on the throat- turn the carb on it's side- take off the bottom and you'll see the JET(small copper screw w/ a small hole in it- if there's no#on it it's most likely a 70 jet. You'll either need to solder it or get a jet kit from Matt @ BMW.----- the noise stuff is what China calls $$$$$$$ I also got my kit from BMW, Low Rider Micargi good luck & ride it like you stole it
 
Last edited:

crassius

Well-Known Member
Joined
Jul 23, 2012
Messages
4,580
Likes
695
#9
I'd guess it is some kind of 2-stroke and maybe an NT style carb - your 'air screw' may be the drain plug and should be in there tight

are you trying to start it with the choke on? that rarely works once it fires a few times
 
Top