Unbalanced the throttle bodies

Woe unto you that bought the first model year of a major remake, perhaps this section can help address any 2014 and later model Ural "imperfections". Here's a special section for folks with the latest rigs to discuss 2014 and later model-related topics such fuel injection, 3-wheel disc brakes, hydraulic steering dampers, spin-on oil filters and other anomalies that don't belong on true Russsian motorcycle ;-P We've gone from using big hammers and greasy wrenches to needing computers and Ouija boards in order to fix our rigs.
Forum rules
Please keep this section specific to issues pertaining to 2014 and later models such as fuel injection, sidecar and rear disc brakes and so forth. Ask general or non-2014 and later specific questions in the main Hammerin' & Wrenchin' section.
Post Reply
User avatar
windmill
Order of Victory
Order of Victory
Posts: 7501
Joined: Tue Feb 12, 2008 1:17 am
Location: Kent, Wa

Unbalanced the throttle bodies

Post by windmill » Tue Feb 26, 2019 10:58 am

Through experimentation and observation I've found my rig idles smoother, hunts less, and doesn't do the occasional off idle skip as often if I have the left cylinder 1 HG lower than the right. I talked to Jason Rae about it and he said it could just be a small anomaly in my OBD2 tool, the rigs system, or that my rig is just happier that way for some reason. Being such a small difference, it's not an indication anything is wrong, and its not unusual.

Unfortunately I was there working and didn't have my rig, but he offered to check it out with their more sensitive and accurate equipment to see if its actually unbalanced, or if its just reads that way.
Barry

"Take care, sir," cried Sancho. "Those over there are not giants but windmills".

2007 Patrol 100k km and counting,
2018 M70

hotflash44
Hero of the Soviet Union - 2019
Hero of the Soviet Union - 2019
Posts: 4674
Joined: Mon Mar 13, 2017 7:03 pm

Re: Unbalanced the throttle bodies

Post by hotflash44 » Tue Feb 26, 2019 11:43 am

do you have the OBD2wiz? let us know if there is a difference in instruments. :cheers:
2016 gear up asphalt grey, name Seryy Medved ,Air America CIA circa 1967/8 Vung Tau Viet Nam USS Tutuila ARG-4 (AND JUST A TOUCH OF AGENT ORANGE!)

User avatar
Tomcatfixer
Commissar
Commissar
Posts: 7144
Joined: Sat Oct 24, 2015 5:10 am
Location: Gordonsville, VA

Re: Unbalanced the throttle bodies

Post by Tomcatfixer » Tue Feb 26, 2019 12:05 pm

:lurker:
- Chad

Gordonsville, Virginia, USA

Current rides:
2015 Ural cT "Mobile Chernobyl", 2001 Ural Patrol "The Patrol", 1999 Ural Tourist "The RPOC", 1994 Honda VFR750F

Previous rides:
2007 Honda VTR1000 FireStorm (Super Hawk in U.S.)
2001 Buell Blast! - - - - - - - 2005 Yamaha FJR1300
1993 Honda CBR600F2 - -1984 Yamaha FJ1100
Two different 1986 Yamaha FZX700S Fazers

User avatar
BlueRockCrawler
Comrade General
Comrade General
Posts: 586
Joined: Fri Mar 18, 2016 4:56 am
Location: Delaware

Re: Unbalanced the throttle bodies

Post by BlueRockCrawler » Tue Feb 26, 2019 4:35 pm

Should be an inch or mm on that measurement, not trying to nitpick, but different scales. A mmHg is a lot smaller than a inHg. I unbalanced mine and they were four hundred Pascal's apart which is only a few mmHg . Perfectly balanced idled poorly and the transition just off idle was rough. I figured that one of the TB's MAP sensors were just off. Someone correct, but I seem to remember that spec is up to 6 percent difference?

Edited for terrible grammar: There should be a "me" after "Someone correct"
Last edited by BlueRockCrawler on Tue Feb 26, 2019 9:03 pm, edited 1 time in total.
2015 Ural Patrol
1993 Suzuki DR 650
2018 Suzuki DR 650
previous Honda's were
1996 750 Magna
2002 750 shadow A.C.E.
2004 919
1985 500 Magna

gobium
Order of Victory
Order of Victory
Posts: 15649
Joined: Wed Sep 07, 2011 2:06 pm

Re: Unbalanced the throttle bodies

Post by gobium » Tue Feb 26, 2019 5:18 pm

Darrell to bat phone.

User avatar
windmill
Order of Victory
Order of Victory
Posts: 7501
Joined: Tue Feb 12, 2008 1:17 am
Location: Kent, Wa

Re: Unbalanced the throttle bodies

Post by windmill » Tue Feb 26, 2019 9:23 pm

BlueRockCrawler wrote:
Tue Feb 26, 2019 4:35 pm
Should be an inch or mm on that measurement, not trying to nitpick, but different scales. A mmHg is a lot smaller than a inHg. I unbalanced mine and they were four hundred Pascal's apart which is only a few mmHg . Perfectly balanced idled poorly and the transition just off idle was rough. I figured that one of the TB's MAP sensors were just off. Someone correct, but I seem to remember that spec is up to 6 percent difference?

Edited for terrible grammar: There should be a "me" after "Someone correct"
Yeah, it's a kPa scale. At 1050 rpm idle it seems to be happiest with the right cylinder at 33 kPa, and the left at 32 kPa.

Jason Rae summed it up pretty well, "if it's running good, it's good, some bikes are just like that".
Barry

"Take care, sir," cried Sancho. "Those over there are not giants but windmills".

2007 Patrol 100k km and counting,
2018 M70

Post Reply