[Orthodox]

Hey guys so i have had this bogging problem with my stock carby for quite some time. When i first start up the bike within couple of seconds i quickly blip the throttle and the bike wants to bogg and shut off. Fast blip of the throttle.......boggs and wants to shut off, i would have to roll the throttle slowley for this not to happen. I then thought it was a warm up problem in that i havent let the bike properly warm up to temp before i blip the throttle. Well i was wrong, it still does this. From a stand still at a traffic light if i want to blip the throttle quickly to get a fast take off the bike will want to bogg for a second then catch itself before it goes. I have cleaned my stock carb as well with no luck.



Recently i purchased a BRAND NEW CARB, and put everthing on there, kick started the bike and it started first kick, i thought i was outta the woods now! But then low and behold, i quickly blip the throttle and the symptons still persist!!!!! What else can i do? I even changed to a brand new carb and this still is happening....what else can this be?





Thanks for everyone who can help!

 

[firepower354]

It's lean. Try 1/4-1/2 turn richer on the idle mix screw.

 

[96speedZ28]

Pilot jet maybe?

 

[Orthodox]

I have a totally stock 110 except for pod filter and exhuast. I heard the VM26 is too much carb for a stock110 so i figured i added those two elements to make it at least acceptable haha.

 

[T Bolt USA]

VERY common , lean pilot circuit condition

adjust screw , or go up one size pilot jet

 

[Orthodox]

Oh really?! Thats good to hear, i guess i gotta go find me some pilots and maybe finally figure this out. maybe i shouldnt of been cleaning and rather of been buying........pilots!

 

[Orthodox]

ok guys after 3 days of messing around i threw in the towel! I richened up the pilot on the stock carb all the way up to 5 jet sizes and it would not go away. Now today i bit the bullet and just decided to get a new carb to remedy this, i put in the mikuni vm26 and the bog is still there!!!!! With the new carb i started off with the stock 22.5 pilot, i also went to a 25-30 and still this weird bogging thing has not gone away. With the fatter jets my spark plugs look black, i also went lean on the pilot as well just to see what it would do. What could this be? Valve adjustment needed? Im lost! PLEASE HELP

 

[96speedZ28]

Read..



http://planetminis.com/f15/symtoms-if-pilot-too-big-152842.html

 

[dood]

If you are free revving the bike in idle with a quick twist a throttle, you are just chasing your tail.

You can't jet a bike like that. You have to be riding the bike with a load on the engine to truly tell what's going on.

 

[Orthodox]

Could this be just a 4 stroke characteristic? If I just roll the throttle the bike seems ok, it's just a very quick blip 1/8 of the throttle that makes it choke out. Instead of tuning on the stand, I took the bike out on runs with pilots from 15 all the way to 25. Man I hope it's something else... Different needles? Needle jets?

 

[Orthodox]

Oh here's a clip on YouTube that's exactly what my bike is doing.

 

[dood]

It's called a drop in velocity in the carb when you open the throttle which is causing "the bog". Carburetors rely on velocity to take fuel out of the float bowl and into the engine. Big bikes have accelerator pumps to help combat this but can lead to an over rich condition at times and the reason they don't put it on smaller bikes is mostly because it's a more expensive carb to put on what the manufactures consider a trail bike vs a performance bike.



You can't tune a bike by what it does on the stand. If it runs well while you are riding it, then leave it be.