bowhunter4265 wrote:
Having a white bike, I see carbon from my pipes on the rear fender

I think your bike is telling you it wants to be black and go faster
Steven

I dont see anywhere I posted that it couldnt happen. Just that it happens more often when rejetted or lugging the bike. We all know from post here, and yours is one of them, that it does happen. I also noted he said it was real. Just not as common as "I" indicated. My views on SVS are based on what I have read here. I have not experienced it, nor do I want to. I had never even heard of it until I found this board. I have no doubt that you are having problems. I hope and encourage you to stay after Yamaha until you get a resolution. I had to replace three fuel senders on a Ford I had before Ford finally acknowledged the problem and reimbursed me for the first two I had paid for. Problems happen and you should do everything you can to get them to stand behind it. My post is to the subject of SVS Phobia, and Yes I do think that maybe we all fear it because we read about it so much here. Knowledge is a good thing, but I still dont think every bike is getting it. It was not an attack on you or a doubt that you are having problems.

Javawave has a point about the SVS phobia. Flashback can tell you I've voiced my concerns about it to him and I've NEVER had any indication that I'm getting it.

The horror stories other posters have related about it have me wondering every time I get a cough from the engine or a backfire of some sort. Although, hearing a HD Fatboy backfire every 5 min. on a charity ride eased my fears a bit about backfiring.

I too know that the problem exists simply from the anecdotal evidence recounted here. So this is no specter in that machine, it's real for sure. I don't understand why dealers and reps continue to insist that it's user error (for lack of a better term). It does also bother me that a modern engine can't recover from an oil level that's a bit high at times without the condition causing debilitating results.

All that aside I'll continue to look forward to every revolution of the engine and mile ride in the saddle. Yeah, I'll keep up with the MMO even though I think I shouldn't HAVE to add it just to get some peace of mind about my bike.

My .02 here, Wish I was riding right now!!!!

M7

smhowse wrote:
bowhunter4265 wrote:
Having a white bike, I see carbon from my pipes on the rear fender

I think your bike is telling you it wants to be black and go faster
Steven

Yah black looks fast, but white is so non threatening, til it passes you

ok getting off topic...

SVS or Carbon build up that causes the valve to stick, many options...
brand of gasoline (additives - alcohol, ethanol, etc.)
Jetting, Pilot, Accel blipping, is it rich at one end and lean on the other or just rich on all circuits
Lugging - taking it easy or run it up through the RPM's and blow out the carbon

I think if you drive easy and the jetting is set on the lean side and you do not blip the accel pump
probably will not have any problems,if thats how you like to ride.
I run my bike fairly steady and firm, when the settings were rich from what DynoJet recommends (used the 190DJ - leaner and DJ Pilot - richer)I had no problems running all the highway 80mph that I drive, but could tell that it was running on the rich side, so I kept leaning off the pilot til I was back to the stock pilot and DJ180(fuel eco stayed about the same haven't got enough tanks on the 180 to be totally happy with it yet weather got colder and warm up was longer)so averaged the same over 40 less than 50 mpg

Lite decel backfires usually indicate that settings are close to perfect by some carb guys...

SVS..........................Does it exist? That part we have established. I HAD it, and got rid of it. I've worked on cars for 20 years, and on bikes for 15, so I know the difference between a little rough running and trouble.

It took me 3 thousand miles (and a lot of embarrassing morning trips to work, then lunch, then home) to shake it, but I did.

I too, was thoroughly disgusted with the bike for a while, as here I am on like my 2nd payment and Boom.....what the .......

To rid yourself of it, it takes time and PATIENCE. Esp. the latter. Some of our regulars here are in the middle of an uphill battle with it, like Law. Law, since your scoot is Bone stock, stick to your guns with Yamaha. But many (read: most) who deal with it have made modifications to their bikes, and that is why it is easier to help those, as MANY have taken the road before them.

In conclusion, yes there is a phobia, to some extent. Bottom line, ride your bikes, and stop worrying about the maybes, and if and when you need some assistance, you have the very knowledgeable resources here at the Clinic. BB

The idea of a central 'repository' for SVS threads is a good idea but I'm not quite sure the best way to approach it.

I don't think it deserves it's own Forum but it may be a good idea to write up a sticky on the information we currently have.

Please remember that people initially come here for help. What you generally see is a disproportionate number of negative threads so it's difficult to tell how widespread a specific problem is, and how much of the problem is caused by the owner 'tinkering' vs a real defect. I would, however, encourage anyone with a stock bike that is not running well to pursue the issue with Yamaha until it is resolved to their satisfaction.

Doc

I have read a lot of the threads on SVS and I think You will find that most of the problems associated with SVS are due to rich mixture and not oil leaking past the valve seals and down the valve stem. If it were it would smoke some or would use oil. I don't believe that is the case here Yamaha Is well known for building nearly bullet proof heads in the industry. I don't know why people are so afraid to run an engine on the lean side. Rich mixtures cause an unbelievable amount of problems. such as oil contamination carbon build up all over the internal combustion area, all down the exhaust route including the exhaust valve. I personally run mine on the lean side and have had no problems what so ever. I pulled the plugs after about 4 months and a few thousand miles and the center porcelain was still white and looked almost new. I get between 45 and 59 mile to the gallon and don't use the enricher except long enough to keep it running on cold mornings. Granted I ride a 1600 but that shouldn't make that much difference in rich and lean mixtures. Optimum mixture is 12.9 to 13.1 to 1 thats air to fuel so you can't run 10 or 11 and not expect to make carbon. JMHO

Mark7 wrote:
Javawave has a point about the SVS phobia. Flashback can tell you I've voiced my concerns about it to him and I've NEVER had any indication that I'm getting it.

The horror stories other posters have related about it have me wondering every time I get a cough from the engine or a backfire of some sort. Although, hearing a HD Fatboy backfire every 5 min. on a charity ride eased my fears a bit about backfiring.

I too know that the problem exists simply from the anecdotal evidence recounted here. So this is no specter in that machine, it's real for sure. I don't understand why dealers and reps continue to insist that it's user error (for lack of a better term). It does also bother me that a modern engine can't recover from an oil level that's a bit high at times without the condition causing debilitating results.

All that aside I'll continue to look forward to every revolution of the engine and mile ride in the saddle. Yeah, I'll keep up with the MMO even though I think I shouldn't HAVE to add it just to get some peace of mind about my bike.

My .02 here, Wish I was riding right now!!!!

M7 This saturday might be a good one...

Bruce, check mail......

So I bought my 06 Midnight Silverado a year and a half ago. It always misfired occasionally when blipping the accelerator, but I really thought I had trouble after my first oil change. I managed to overfill it by about a quart (confused by the shop manual) and drove it for about 100 miles before I realized my error. For the next 1000 miles it clattered so loud at times that I thought I ruined a lifter or had SVS or some other dreaded disease. At the time everything was stock. Last fall I proceeded to put on a BAK, rejetted the carb to relatively lean settings, and installed a new set of V&Hs. I've put on another 500 miles since these changes and now have no complaints - I don't notice the noise anymore and the bike runs great

I guess my point is that I think this bike comes stock with fairly rich carb settings and a noisey valve train. If you really have troubles with your motor, you obviously need to get it fixed. Otherwise, the best fix is to lean out the carb, get louder pipes and use ear plugs ... and avoid overfilling when you change the oil. ~SG