popping form the pipes

I'm getting back fire or popping from my pipes and the enjine wants to stall out wondering what can becauseing this to fix.
it's an 82 maxim 650 with the 650 seca motor and carbs

 

usually popping is a sign of a lean condition. pull the plugs and see what they tell you they need to be a tan color if they are white that is where your problem is. You either need to clean the carbs, check for leaks in the fuel sys, vacuum line if yours has a vacuum operated petcock. Turn the petcock to PRI (this is the prime setting and does not rely on vacuum) and see if the problem corrects itself.

 

That sounds like your Mixture is set-up too Lean.
You'll have to do some tweaking of the Pilot Mixture Screws to add some Richness to the Mixture.

 

i'll give it a try and see what happens

 

how do i ajust the setting to do that

 

does it pop when you're on the gas or when you're letting off, and are the pipes stock?

 

it pops when in low rpms and i have to feather it to get it over 2 grand or it will stall out. the pipes are 4 into 1 that came with the seca my maxim pipes have a hole in the crossover thats why i'm using them.
i'm thinking that it might be the moduale on the side of the frame it's from the maxim but the motor is the seca

 

Is this something that just startrd or it is a long time problem? Backfire in the exhaust could be caused by bad timing (chain jumped a cog) as well as being too lean. When it runs at the upper rpm's does the motor run smooth? If so I'd lean... more towards the carbs being lean rather than the timing.

 

ya i've only noticed it at idle and low rpms

 

as for a long time i don't know. i bought another bike for the motor that hasent been used for 4 yrs and using it in my maxim

 

Sounds like dirty carbs to me. That would be a place to start.

 

so i guess soak the pricks in some seafoam lol

 

You could do that. But remember if its popping your lean and thats a bad thing for air cooled engines. Have you checked the plugs to see if they are white or look like they a have been overheated?

I would remove them and check your float bowls. What I have found is most of the time you will find residue coating your interior of the float bowl and the jets. Seafoam and other products really don't remove heavy deposits. I have tried but I have not found "A Mechanic In A Can" Thanks to this forum and people I have met here there are a few simple things you can do to clean the lower ends of you carbs whith out the expence of taking it in to a shop.

See RickCoMatic's Old School carb cleaning. You can buy carb dip but I have boiled the carb bowls in lemmon juice and got great results. The junk in there comes right out and the aluminum looks like new. The jets are brass so you don't want them in the juice because it will thurn them black. I heard that Tarnex the silver dip works well on thise parts. I have not tryed it yet but next time I get to Walmart I'll pick some up.

The last time I just used a stainless steel brush the size of a tooth brush I picked up at the welding supply store near my house. It shined them up nicely and then I used a tourch tip cleaner to clean the jet holes. You will want to be careful not to enlarge the jet sizes. A Little time spent on your carbs will make riding that bike a better experiance. Good Luck

 

what type of carbs do you have on that bike, you mention a 750 motor.
but no mention of 750 jetted carbs.

 

Seeing that the poping happens at low RPM to me it sounds like your battery isnt getting enoth charge from your alternator so its not building up enoth charge for your plugs , or your regulator\rectifier might have broken , this happend on my dads ducati 900 MHR . if i was you i would be cheking the output from my alternator.

P.S if any one thinks this is not wats wrong with the bike then sorry.