need some tech advice

[BIG HOUSE]

Ok well the dog (07 Bulldog efi) is sick. the front cyl either isnt firing or isnt firing often its @ the dealer and he ran all the diag checks and it says everything(inj,coil) is good. He put new plugs in it switched the plug wires, did a compession check and still nothin :bang: wonderin if its the ehc. It had a bad intake gasket and those are now replaced. Any clues
thanks in advance

 

[dragracer1]

Hi, Is the cylinder firing intermitently and does this happen when the motor gets hot. If there is an issue it should have come up with a historical code that can be read at the dealer and then that information can to transmitted to BD and they can tell the dealer exactly what the problem is. Also what pipes & air cleaner is on the bike.

Jeff
North Shore Motorcycles

 

[BIG HOUSE]

The reason I said its not firing correctly is because the mech said he felt the he could touch the front pipe when the rear was hot. It runs like shit from start up. And the air cleaner is stock and VH big radius 2/2 with a new o2 in the front pipe. The past codes were to much air(front cyl) because of the bad intake gasket. but now no codes.

 

[JDog]

Can you put a timing light or whatever way, on the front and see if it firing? I wish you would take that picture off, it takes me 15 minutes to read the post!:2thumbs:

 

[Steve1028]

Have your pushrods been adjusted? Could be a locking nut on the front cylinder pushrod has backed out and the push rod collapsed causing the motor to act like it has jumped timing?

 

[BIG HOUSE]

He said it was getting spark and the coil checked out as good. sorry bout the pic lol

 

[BIG HOUSE]

Have your pushrods been adjusted? Could be a locking nut on the front cylinder pushrod has backed out and the push rod collapsed causing the motor to act like it has jumped timing?

wouldnt that affect the compression?

 

[Steve1028]

wouldnt that affect the compression?

Not really sure how it would affect compression. I just had a similar issue with mine and it was a pushrod. BadBrad had the same issue. Not sure, but hope it is something that simple.

 

[BIG HOUSE]

Talked to tech and when he rasies the idle to 1800 it seems to run fine but back 1400 and doesnt wanna run and shows stuck o2 sensor and it goes away when the idle is rasied

 

[mobsta]

if it is an intake pushrod that gets loose it would affect fuel intake,if it was an exhaust pushrod the valve could not be opening properly same as the intake,valves have to open.you can have all the spark in the world,not enough fuel bike runs bad.just sayn which really doesnt mean much:loony:

 

[woodbutcher]

has he swapped out the o2 sensor? could be carbon on the tip of the sensor. could be bad wire to the sensor.

 

[mobsta]

dont know much about efi but you said the frt 02 sensor is new,is there one on the rear pipe?if so which one shows sticking?

 

[woodbutcher]

dont know much about efi but you said the frt 02 sensor is new,is there one on the rear pipe?if so which one shows sticking?

you sure about that, he said they changed the plugs but didn't mention the sensors. i think

and don't take what i say as gospel, i don't know shit.

 

[mobsta]

yep,look at his second post,stock cleaner,big radius pipes with new 02 in front pipe

 

[BIG HOUSE]

dont know much about efi but you said the frt 02 sensor is new,is there one on the rear pipe?if so which one shows sticking?

front one sticking only at idle though

 

[BIG HOUSE]

if it is an intake pushrod that gets loose it would affect fuel intake,if it was an exhaust pushrod the valve could not be opening properly same as the intake,valves have to open.you can have all the spark in the world,not enough fuel bike runs bad.just sayn which really doesnt mean much:loony:

He said he checked them and it is an intermitant problem not constant so it cant be the pushrods.

 

[mobsta]

i was just commenting on what pushrod adjustments being off could do.if the 02 sensor is sicking even at idle dosent sound right,unless its supposed to at idle!again i dont know jack about efi.good luck and keep us posted

 

[BIG HOUSE]

Thanks Im not a big efi guru yet but it looks like Im gonna find my way there one way or another:bang: Im sure when Neil sees this he will have plenty of input knowing all of the changes he has done to his efi bike. Or one of the many other knowledgable efi techs on this site.

 

[BIG HOUSE]

Well just got of the phone with the mechanic and he says hes stuck untill he can get some tech support from BD hope that happens on mon cause I am missing the rally tommorow and not happy:angry: Livin in Mi we dont get much ridin time and now its here and my bike isnt:angry:

 

[Dozer1]

I like the pic! What was the question?