89-90 model banshee idle/WOT bogging issues.

[pondtunes]

Okay I had a general kinda question thread but this has moved to more of the repairs section now so in an effort to put it in the right place heres a new topic..

 

The original topic was HERE: http://bansheehq.com/forums/index.php?showtopic=126724 where It was suggested that I tear down the carbs and clean them, thus the following images of the cleaning and the result.

 

 

*Note I apologize for how dirty this quad is, it needs a proper cleaning from head to toe and I *WILL* get it done hehe.

 

 

#1 Someone in the previous thread suggested my exhaust was missing output pipes... If it is it should be fairly obvious here lol.... Suggestions? Do i need entire new silencers or can the output pipes be purchased?

 

 

#2 Plastics, Right Silencer, Air Box / Filter Removed... Just provided to see if theres anything you can spot out of place/wrong etc.

 

 

#3 Alright aside from the fuel line that isn't really fuel line (will be replaced) this elbow that goes into the carb is quite loose.... It appears that the little ribs on the elbow itself are worn away the grooves in the carb seem okay visually... Are these replaceable? If so what's it called? After re-assembly and a test run it came loose and was actually leaking fuel on the motor!

 

 

#4 Another reference photo, the wires here have no protection and one was routed right under the clutch mechanism I re-routed and taped them up to protect them a bit more.. Let me know if you see anything else that needs attention!

 

#5 - Carbs are removed i suspect this throttle cable should be replaced as it has quite a bit of slack and no way to take it out... I'm considering a thumb throttle changeover so i'll look into the cable swap when I do that.

 

#6 - Starting disassembly, i hear theres a kit to remove the little boxes atop the carbs... Someone has already cut the wires for me so I assume they don't work anyway.

 

Continued next post due to picture count...

[pondtunes]

#7 - Okay you can't exactly tell from this photo but this needle is bent slightly, it doesn't appear to impede operation at all but If i should change it I will.

 

#8 - The float bowl off the right carb... This carb has a hose attached to the lower barb the left carb does not have one.. Overflow I assume? They looked pretty clean inside no foreign debris.

 

#9 - Bottom of the floats and the jet I could see through both of them well enough but i cleaned them out and checked them they have the number 200 stamped on the jets. (both match)

 

#10 - looking down through the jets, I could see through both of them with no obstructions.

 

#11 - The jet out of the right hand carb, stamped with a 200

 

#12 - What is this screw for?

 

#13 - This bit of plastic was attached on the right hand carb but when i removed the bowl it was lying in the bottom of the left carb... I tried to press it in upon re-assembly but it doesn't stick like the other one... I put the bowl on turned it right side up shook it then removed it again with the bowl turned up... It seemed to stay but will fall off if the bowl isn't installed. What is it and does it need to be replaced??

 

 

Okay in conclusion after re-assembly everything was working smoothly the carbs were opening and closing in sync.. It fired first kick i drove out the driveway and it seemed to have pretty good throttle response.. However; theres a very mild hill on the road I live on and when I hit second i tried to nail it..... Still bogging down, so i try accellerating slowly and it comes up and once it hits the powerband it really winds out hard. Upon hitting third if I nail it again it bogs and will backfire (out the right hand pipe so im told) I wasn't experiencing any backfires when the bike was run without an air cleaner/boots (how it was when i got it.)

 

Ideas? I live in central north carolina Elevation is 791 feet... Temp today was 64 ish, and it's been in the high teens, I like to ride in the snow which we get very little of summer temps are as high as 100..

 

LMK if you need to know anything else or what to try next!

[GNR101]

did you clean the pilot jet?

pic #8 its up that small hole once you move the plastic bit off.. you get it with a lil flat head screw driver

[SkinInd_Banshee]

It looks like someone took a sh*t on your motor. Why is the outside of your carbs wet ? Also, get some better fuel line and a crossover tube for your poor engine

[pondtunes]

did you clean the pilot jet?

pic #8 its up that small hole once you move the plastic bit off.. you get it with a lil flat head screw driver

 

 

FML... No.. No I didnt lol..

*stabs self*

I'll tear it down again maybe tomorrow and report back lol.

 

I am gonna be a total pro at disassembling this thing and putting it back together...

[pondtunes]

It looks like someone took a sh*t on your motor. Why is the outside of your carbs wet ? Also, get some better fuel line and a crossover tube for your poor engine

 

 

Yeah It's been way too cold to properly clean this thing and i just haven't felt like carrying it to the car wash yet lol.. I'll properly degrease it and clean it up good soon!

 

Proper Fuel Line is on the list.....

 

as for a crossover tube you're the second one to mention that... What is this mysterious item that i'm apparently missing and where's it normally installed?

*edit* I'm guessing its probably supposed to pe in pic #4... Where the bolts are plugging the intake boot things on each side... Pretty sure thats not yammie engineering...

Edited February 21, 2010 by pondtunes

[SkinInd_Banshee]

Yes, you can also install a boost bottle.

[pondtunes]

Yes, you can also install a boost bottle.

 

 

Oooh! baker totally sent me one of those with the carb boots and air cleaner! Thanks i'll throw that in when i rip these things out to clean em!

[SkinInd_Banshee]

To answer more of your questions; The screw on the bottom is to drain your bowls(can be easily stripped on head), The tube in the float bowl itself looks fine. The plastic piece inside is a Yamaha splash guard for the main jet if the one you have wont stay tight order a new one. Make sure your pilot jet is flowing. Also, what do your spark plugs look like?

[pondtunes]

Okay guys, back with news.

 

Carbs are COMPLETELY clean

Jets are as follows: 200 Main, 12.5 or 2.5 pilot jet, theres some kind of symbol but man they're hard to read...

Installed crossover pipe

Set air screw at 1.5 turns out

Installed Air Cleaner

 

Idle's perfectly now and kicks first crank.

If you're running pretty flat it will wind out good,

Up a very very very minimal grade however at 1/2 or 3/4 or WOT when theres a load it bogs down hard and backfires.

 

I seem to have a noticeable amount of fuel/oil coming out of my exhaust now which wasn't present before.

My plugs are very black and very oily now

 

See Below:

LEFT PLUG

 

RIGHT PLUG

 

 

Our gut feeling is now its drowning in fuel....

 

We tried playing with the air screw with no avail, as far out as 2.5 turns as far in as 3/4 turns... I think in = less air = rich but i could be wrong...

Edited February 27, 2010 by pondtunes

[pondtunes]

Any ideas on what to try next? I wanna ride! hehe

[Whyzedtwofiveoh]

Any ideas on what to try next? I wanna ride! hehe

Are you running with your airbox lid?

I have a similar problem with my 1990 Banshee, but only when i hit puddles that are really deep, my throttle will stick for maybe 5 seconds

If you want a quick fix i guess you could try hotter plugs, like BR9s or something

Edited February 27, 2010 by Whyzedtwofiveoh

[pondtunes]

Okay, pulled the carbs yet again, this time took off the intake and pulled the reeds.

They didn't visually look very dirty and i can't spot any cracks in either set.

I did however notice what i assume is the LOWER reeds do have a visually noticeable gap when looked at from the end. (see pictures)

both sides seemed to have this gap, if you press lightly with your finger they close up but there is a gap here..

 

 

 

Is there a way to tell which side is supposed to be up? what else should I check while this thing is torn this far down..

The rubber intake boots seemed to have some cracking going on but the cracks didn't go all the way through.

Also if making these pictures smaller would make anyone more happy I will but i thought the larger pictures might show more detail!

[shawn941]

Any ideas on what to try next? I wanna ride! hehe

what are your mods on the bike? usually a bone stock banshee with stock pipes and everything run a 200 main,,,if you have aftermarket pipes your jetting is waaaay off. even u run it with the air box lid off you are gonna have to rejet,,,tell us your mods

[pondtunes]

Hmm man theres a problem.. I bought this thing second hand and I don't know much about it.. I was told the carbs had been rebuilt but the splash guard thingy wouldn't stay put so whoever did it shoulda replaced that imo.

 

It was running without an air cleaner to begin with, and no airbox lid. Now it has proper carb boots as well as an air cleaner. The exhaust as far as I know is stock, i'll go look and see if there are any markings that might identify it.