The Bog! - Yamaha YFZ450 Forum : YFZ450, YFZ450R, YFZ450X Forums

matt33 · 06-09-2008, 05:07 PM

CAN ANYBODY TELL ME ANYTHING ABOUT THIS F2-RACING POWERBACK SYSTEM? DOES IT ELIMINATE THE BOG PROBLEM TOTALLY? ANY INFO WOULD BE GREATLY APPRECIATED.

joseph who? · 06-09-2008, 10:40 PM

found this over on yfz tech.

Where the rubber o ring is i put a small zip tie instead because there was still play in the little lever when i punched the throttle real qiuck with the rubber ring ( it would streatch). I am running a 45 pilot and 35 leak jet with the ac pump screw turned OUT i think half a turn or alittle more. The bog is totaly gone. The way it runs now is friggin amazing with no bog.

matt33 · 06-10-2008, 06:30 PM

Quote:

found this over on yfz tech.

Where the rubber o ring is i put a small zip tie instead because there was still play in the little lever when i punched the throttle real qiuck with the rubber ring ( it would streatch). I am running a 45 pilot and 35 leak jet with the ac pump screw turned OUT i think half a turn or alittle more. The bog is totaly gone. The way it runs now is friggin amazing with no bog.[/b]

THANKS ALOT. ILL GIVE IT A TRY. TRY ANYTHING AT THIS POINT!

350oshin · 06-11-2008, 12:46 PM

or you can buy the R and D power pump which has a adjustible leak jet and a upgraded stiffer spring so you dont need to do the o-ring mod.....mines completely gone also but i have also gain alot in throttle response

FAB450$ · 06-17-2008, 06:19 PM

what side of the carb is it on and under what ?

helmet · 06-17-2008, 11:31 PM

dang i never saw this thread before, and just used a zip tie to begin with. just for the fact that o-rings are rubber, and stretch, so i just zip tied it. good stuff man. my bogs gone too. between that, rejetting, more air flow in to create more vacuum in the cab, and the leak jet. my bog is pretty much gone.

norcalrider · 06-18-2008, 01:57 PM

I agree with 350....I bought one and I LOVE it! It pulls harder and faster!

yfz528 · 06-19-2008, 10:46 AM

what side of the carb is that located on. i dont think i am going to remove the carb from the bike to try this out.

helmet · 06-19-2008, 02:44 PM

you dont have to remove the carb to mess with the accelerator pump linkage. its in the throttle assembly. just take the cover off the throttle assembly.

matt33 · 06-19-2008, 08:12 PM

Quote:

found this over on yfz tech.

Where the rubber o ring is i put a small zip tie instead because there was still play in the little lever when i punched the throttle real qiuck with the rubber ring ( it would streatch). I am running a 45 pilot and 35 leak jet with the ac pump screw turned OUT i think half a turn or alittle more. The bog is totaly gone. The way it runs now is friggin amazing with no bog.[/b]

THANKS ALOT. WORKS GREAT. WENT WTH A 162-MAIN, 48-PILOT, AND A 35-LEAK. A GOOD MATCH WITH THE HMF. RUNS AWSOME!!!

helmet · 06-20-2008, 03:00 AM

whats ur elevation?

matt33 · 06-24-2008, 05:49 PM

Quote:

whats ur elevation?[/b]

sorry took so long. 1800 ft.

chadkrash · 07-13-2008, 03:04 PM

the bog is caused by improper tuning. Or maybe a low-quality exhaust. (this includes Nmotion) simple really.....

**Stix2007** · 07-13-2008, 03:08 PM

Quote:

the bog is caused by improper tuning. Or maybe a low-quality exhaust. (this includes Nmotion) simple really.....[/b]

idk thnk you can blame it on the exhaust, people have the bog with every exhaust. THe bog is present with the bike in full stock form

crooks · 07-13-2008, 03:35 PM

Quote:

the bog is caused by improper tuning. Or maybe a low-quality exhaust. (this includes Nmotion) simple really.....[/b]

What are some high quality exhausts?

**Stix2007** · 07-13-2008, 03:40 PM

Quote:

What are some high quality exhausts?

[/b]

lmfao, nearly everyone on here would love to get their hands on an nmotion especially if they werent so loud. Guess quality doesnt matter to any of these people.

chadkrash · 07-13-2008, 05:41 PM

I dont wanna argue with anyone on here, thats not what i was aiming for. Eveeryone on here wants an Nmotion, but everyone on here seems to have "the bog" problem also, so whats that tell you??? I dont have a problem with bog, but i did with my Nmotion even after having the carb apart like 20 times trying to tune the darn thing. HMF has been the most user friendly exhaust i have ever owned. It took 3 trys, and my tuning is perfect. I dont have the issue with the bog. I also know TC is a great exhaust. Sparks are junk (however they make good power), Nmotion are junk (also-make great power but bad tuning) thats my personal experience. You have to look at things other than power. If you want an Nmotion so bad, then dont complain when the bike has a bog.

chadkrash · 07-13-2008, 05:44 PM

Also in stock form, the YFZ is tuned TERRIBLY WRONG. So of course its going to bog. Once you take the airbox lid off, its kinda close but still a little off. You dont need any fancy carb bolt ons for proper tuning (or to eliminate bogging). It just takes time and patience. Once again, i dont have ANY BOGGING WHATSOEVER

**Stix2007** · 07-13-2008, 05:49 PM

Quote:

I dont wanna argue with anyone on here, thats not what i was aiming for. Eveeryone on here wants an Nmotion, but everyone on here seems to have "the bog" problem also, so whats that tell you??? I dont have a problem with bog, but i did with my Nmotion even after having the carb apart like 20 times trying to tune the darn thing. HMF has been the most user friendly exhaust i have ever owned. It took 3 trys, and my tuning is perfect. I dont have the issue with the bog. I also know TC is a great exhaust. Sparks are junk (however they make good power), Nmotion are junk (also-make great power but bad tuning) thats my personal experience. You have to look at things other than power. If you want an Nmotion so bad, then dont complain when the bike has a bog.[/b]

You are right about the tuning on the nmotion pipes i have heard that form several people. I'm just saying the bog is not a result of the exhaust being poorly made. The nmotion and some other pipes require leaner jets than most pipes in some peoples experience which is probably why they are more difficult to tune because people dont knw where to start. I had the bog with my stock pipe, stock jetting, then with baffle out stock jetting, baffle out rejet, and i had it with my venom and rejetting

I did the carb mod with the ziptie and adjust my idle up just a tad higher and now i have removed 95% of the bog. The other small part im sure i can get rid of with a change in leak jet.

If the bog was the result of an exhaust then why would the R&D pump with adjustable leak jet cure the problem?

The jetting from the factory is just not correct from what ive read and studied.

Im not trying to argue about this either so this is my last post on the subject

sorry for even starting anything

bigjosh37 · 07-13-2008, 05:52 PM

The bog is when you stab the throttle, the accelerater pump has to catch up to the throttle because they're connect with an o-ring, which gives it that second or two of hesistaition before it catches up.
Thats the only culprit to the bottom end bog. There is no such thing on my Honda. and on my brother's YFZ it is terrible. Simple fix really.

Chadkrash what the hell are you talking about, at least understand the dynamics before you go to false claiming.

Sparks a bad exhaust, I guess that explains the intense popularity. I have ownde one and it was a very nice unit that was simple to tune. I would like further explanation of why its a bad exhaust.

06-09-2008, 10:40 PM	#2 (permalink)
joseph who? Senior Member Join Date: Sep 2006 Location: Tifton MF'ing Ga. Posts: 522	found this over on yfz tech. Where the rubber o ring is i put a small zip tie instead because there was still play in the little lever when i punched the throttle real qiuck with the rubber ring ( it would streatch). I am running a 45 pilot and 35 leak jet with the ac pump screw turned OUT i think half a turn or alittle more. The bog is totaly gone. The way it runs now is friggin amazing with no bog. __________________ E-Mail: skidmark@mchsi.com http://www.facebook.com/#!/youbetterfreakinbelieveit

06-11-2008, 12:46 PM	#4 (permalink)
350oshin Senior Member Join Date: Mar 2008 Posts: 153	or you can buy the R and D power pump which has a adjustible leak jet and a upgraded stiffer spring so you dont need to do the o-ring mod.....mines completely gone also but i have also gain alot in throttle response __________________ -HMF ironman, cam mod, RandD powershot(the best mod ever!!!!),GYTR intake 170 main,45p ,2 1/4 fuel screw, leakjet #50 -Pro Armor fat peg nerf, pro armor kill switch with baldwin adaptor

06-17-2008, 11:31 PM	#6 (permalink)
helmet Senior Member Join Date: Apr 2008 Location: detroit, michigan Posts: 330	dang i never saw this thread before, and just used a zip tie to begin with. just for the fact that o-rings are rubber, and stretch, so i just zip tied it. good stuff man. my bogs gone too. between that, rejetting, more air flow in to create more vacuum in the cab, and the leak jet. my bog is pretty much gone. __________________ 05 yfz450 se spark arrestor removed w/ lid on zip-tied accelerator pump linkage

06-18-2008, 01:57 PM	#7 (permalink)
norcalrider Senior Member Join Date: Dec 2006 Location: Oakdale, Ca (Nor Cal) Posts: 3,105	I agree with 350....I bought one and I LOVE it! It pulls harder and faster! __________________ 2007 Fox/Laeger YFZ Sponsors: FourTech Industries<<<Hit them up for awesome customized clothes,Precision, RK Racing Chains, SixSixOne, GoPro, Steel Optics Nor Cal ATV Site

06-19-2008, 02:44 PM	#9 (permalink)
helmet Senior Member Join Date: Apr 2008 Location: detroit, michigan Posts: 330	you dont have to remove the carb to mess with the accelerator pump linkage. its in the throttle assembly. just take the cover off the throttle assembly. __________________ 05 yfz450 se spark arrestor removed w/ lid on zip-tied accelerator pump linkage

06-09-2008, 05:07 PM	#1 (permalink)
matt33 Junior Member Join Date: Jun 2008 Posts: 5	CAN ANYBODY TELL ME ANYTHING ABOUT THIS F2-RACING POWERBACK SYSTEM? DOES IT ELIMINATE THE BOG PROBLEM TOTALLY? ANY INFO WOULD BE GREATLY APPRECIATED.

06-17-2008, 06:19 PM	#5 (permalink)
FAB450$ Senior Member Join Date: Oct 2007 Location: NW chicago burbs Posts: 172	what side of the carb is it on and under what ?

06-19-2008, 10:46 AM	#8 (permalink)
yfz528 Senior Member Join Date: May 2006 Posts: 200	what side of the carb is that located on. i dont think i am going to remove the carb from the bike to try this out.

06-20-2008, 03:00 AM	#11 (permalink)
helmet Senior Member Join Date: Apr 2008 Location: detroit, michigan Posts: 330	whats ur elevation? __________________ 05 yfz450 se spark arrestor removed w/ lid on zip-tied accelerator pump linkage

07-13-2008, 03:04 PM	#13 (permalink)
chadkrash Senior Member Join Date: Apr 2007 Posts: 875	the bog is caused by improper tuning. Or maybe a low-quality exhaust. (this includes Nmotion) simple really..... __________________ Atva Open B and 4-stroke B #382

07-13-2008, 05:41 PM	#17 (permalink)
chadkrash Senior Member Join Date: Apr 2007 Posts: 875	I dont wanna argue with anyone on here, thats not what i was aiming for. Eveeryone on here wants an Nmotion, but everyone on here seems to have "the bog" problem also, so whats that tell you??? I dont have a problem with bog, but i did with my Nmotion even after having the carb apart like 20 times trying to tune the darn thing. HMF has been the most user friendly exhaust i have ever owned. It took 3 trys, and my tuning is perfect. I dont have the issue with the bog. I also know TC is a great exhaust. Sparks are junk (however they make good power), Nmotion are junk (also-make great power but bad tuning) thats my personal experience. You have to look at things other than power. If you want an Nmotion so bad, then dont complain when the bike has a bog. __________________ Atva Open B and 4-stroke B #382

07-13-2008, 05:44 PM	#18 (permalink)
chadkrash Senior Member Join Date: Apr 2007 Posts: 875	Also in stock form, the YFZ is tuned TERRIBLY WRONG. So of course its going to bog. Once you take the airbox lid off, its kinda close but still a little off. You dont need any fancy carb bolt ons for proper tuning (or to eliminate bogging). It just takes time and patience. Once again, i dont have ANY BOGGING WHATSOEVER __________________ Atva Open B and 4-stroke B #382

07-13-2008, 05:52 PM	#20 (permalink)
bigjosh37 Banned Join Date: Feb 2005 Location: pine level, alabama Posts: 1,321	The bog is when you stab the throttle, the accelerater pump has to catch up to the throttle because they're connect with an o-ring, which gives it that second or two of hesistaition before it catches up. Thats the only culprit to the bottom end bog. There is no such thing on my Honda. and on my brother's YFZ it is terrible. Simple fix really. Chadkrash what the hell are you talking about, at least understand the dynamics before you go to false claiming. Sparks a bad exhaust, I guess that explains the intense popularity. I have ownde one and it was a very nice unit that was simple to tune. I would like further explanation of why its a bad exhaust.

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