:: Yamaha Virago XV Forums That Rock!!! General Help Running problem (SOLVED)

#1:  Running problem (SOLVED) Author: tyerkey Post Posted: Wed Aug 25, 2010 8:33 am


Here's what I have going on. I recently rebuilt the top end of my 1981 VX920R. I have been debugging the thing. I have had a miss at 2400 rpms that I thought retorquing the front cylinder had fixed. However, on the way to work I realized the problem had simply changed. It idles perfectly. It will accelerate gently but not if I twist on too much throttle she misses for a few seconds and picks up. It seems the longer I keep the throttle twisted, the more likely a miss. It feels like it is running out of gas. No, the tank is full. It sometimes backfires just before it picks up again. A significant bump will also cause the problem.

To me, it sounds like a float level issue. I think the compression leak masked part of this problem until I fixed that issue.

Does anyone have any suggestions?

#2:   Author: mark75 Post Posted: Wed Aug 25, 2010 8:54 am

carbs securely seated in manifolds / vacuum leak?

#3:  Re: Running problem Author: tyerkey Post Posted: Wed Aug 25, 2010 9:17 am

The carbs are seated well. There are no current vacuum leaks as of last night. I have been over that stuff repeatedly but will check again of course...

#4:   Author: coalstoves Post Posted: Wed Aug 25, 2010 2:56 pm

First check the battery and charging system, the TCI and coils need everybit of the 14v spec calls for .
Using the spec from any service manual I would verify the resistance readings of the ignition related components and I will just assume you already have installed NEW AP63 plugs and have them properly gapped . Next if all the readings check out I would perform the spark gap test . Then into the carbs for a clean and rebuild .Verify the petcock operation also.

#5:   Author: tyerkey Post Posted: Thu Aug 26, 2010 9:23 am

Problem Solved. I tightened the carb boot clamps even though they seemed tight enough. She runs perfectly. It is amazing how much small changes effect big improvements or decreases in performance on this bike.

#6:   Author: totallyredvirago Post Posted: Thu Aug 26, 2010 9:47 am

go to the top of this post. click edit and under your title type in (SOLVED)... congratulations......dan

#7:   Author: coalstoves Post Posted: Thu Aug 26, 2010 5:16 pm

Nothing beats a good visual inspection,, It has amazed me the things that can come loose or silently an slowly just crap out. General Help Running problem (SOLVED)

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