Forum Donations
Search
VTF Google Search
 Click Here

89 XV750 running hot on #2

  • Advertisement

Post a reply

89 XV750 running hot on #2

PostAuthor: twin66 » Wed Aug 08, 2018 10:43 pm

Edit: whoops, it's an 1983, not 89




Hello, so I have the bike running fairly good, but fuel mileage seems low. I was getting low 30's doing about 65mph consistently. My commute is 24 miles/day, highway except for a mile and a half through town to work (still 30mph).

Plug looked decent, but choke would just kill the engine, and would run worse when cold in the mornings.
I had the dynojet kit installed, and decided to try it stock, so I installed the original jets (122) and needles, and lowered floats to proper position, they were slightly high, to the point the mouth of the carb was wet with fuel when I pulled them.

So now, runs good, but definitely hotter. After home from work today, front cylinder was 305F right by the spark plug, rear was 280-285. Check for intake leaks, all good. Ambient temp was about 86F.

Was debating about keeping these jets, and just swapping in the needles from the dynojet kit.

Thoughts? Seems hot to me, but I'm still learning bikes.

Thanks, Craig
Last edited by twin66 on Thu Aug 09, 2018 8:22 am, edited 1 time in total.

twin66
Junior Membership
Junior Membership
 
Posts: 23
Images: 0
Joined: Sun Aug 21, 2016 6:02 pm
Location: Alberta, Canada Flag
Bike year & model: 1983 XV500K Virago
1983 XV750 Virago
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: bstig60 » Thu Aug 09, 2018 8:14 am

Pull the plugs and check the color of them. You would seem to be running lean on the front cylinder. If the plug tip is white, turn the pilot screw out 1/2 turn counterclockwise and see if that makes a difference.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province and Country. It is easier to help you if we know where you are.

SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

Image
User avatar
bstig60
Mod
Mod
 
Posts: 12814
Images: 38
Joined: Sun Jun 08, 2008 6:16 pm
Location: Sharpes, Florida Flag
Bike year & model: 1999 Yamaha Virago XV1100LC Cruiser,
1982 Yamaha Seca XJ750RJ w/factory touring package
2003 Honda Goldwing GL1800 Touring
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: twin66 » Thu Aug 09, 2018 11:15 am

Here is the spark plug. Doesn't look much different than before when it was running rich. With a cold engine and above 80 ambient, the choke makes it worse, and barely idles at 800rpm and keeps trying to die unless I hold the throttle open, until it warms up.

I did readjust the pilot screws last night, but didn't have a chance to drive it and check it again.
You do not have the required permissions to view the files attached to this post.

twin66
Junior Membership
Junior Membership
 
Posts: 23
Images: 0
Joined: Sun Aug 21, 2016 6:02 pm
Location: Alberta, Canada Flag
Bike year & model: 1983 XV500K Virago
1983 XV750 Virago
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: bstig60 » Thu Aug 09, 2018 2:28 pm

That plug is burning lean. Lean means HOT! Idle should be adjusted at 1000-1200 RPM.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province and Country. It is easier to help you if we know where you are.

SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

Image
User avatar
bstig60
Mod
Mod
 
Posts: 12814
Images: 38
Joined: Sun Jun 08, 2008 6:16 pm
Location: Sharpes, Florida Flag
Bike year & model: 1999 Yamaha Virago XV1100LC Cruiser,
1982 Yamaha Seca XJ750RJ w/factory touring package
2003 Honda Goldwing GL1800 Touring
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: twin66 » Thu Aug 09, 2018 10:46 pm

When it's warmed up, it idles at 1050 or so. It's only when its cold it idles about 800, even with the choke on. I can't seem to get it higher.

twin66
Junior Membership
Junior Membership
 
Posts: 23
Images: 0
Joined: Sun Aug 21, 2016 6:02 pm
Location: Alberta, Canada Flag
Bike year & model: 1983 XV500K Virago
1983 XV750 Virago
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: bstig60 » Fri Aug 10, 2018 7:27 am

That's kind of normal, my 1100 does the same thing and so does my Seca....
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

Please take the time to edit your profile to show your location. City, State/Province and Country. It is easier to help you if we know where you are.

SERVICE MANUAL DOWNLOAD LINK
http://viragotechforum.com/viewtopic.php?f=220&t=31501#p279545

Image
User avatar
bstig60
Mod
Mod
 
Posts: 12814
Images: 38
Joined: Sun Jun 08, 2008 6:16 pm
Location: Sharpes, Florida Flag
Bike year & model: 1999 Yamaha Virago XV1100LC Cruiser,
1982 Yamaha Seca XJ750RJ w/factory touring package
2003 Honda Goldwing GL1800 Touring
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: twinnut67 » Mon Oct 01, 2018 4:54 pm

twin66 wrote:When it's warmed up, it idles at 1050 or so. It's only when its cold it idles about 800, even with the choke on. I can't seem to get it higher.

What is the altitude where you live.

twinnut67
Junior Membership
Junior Membership
 
Posts: 21
Joined: Wed Sep 16, 2015 9:44 am
Location: Nokomis, Fl Flag
Bike year & model: 1981 xv750 virago
Sex: Male

Re: 89 XV750 running hot on #2

PostAuthor: twin66 » Mon Oct 01, 2018 10:33 pm

twinnut67 wrote:What is the altitude where you live.


It's appr. 670m/2200ft

twin66
Junior Membership
Junior Membership
 
Posts: 23
Images: 0
Joined: Sun Aug 21, 2016 6:02 pm
Location: Alberta, Canada Flag
Bike year & model: 1983 XV500K Virago
1983 XV750 Virago
Sex: Male



Post a reply


  • Advertisement

Return to Yamaha Virago XV750

Who is online

Registered users: 15-daraujo, Exabot [Bot], Google [Bot], gswatson, rantingsmith