Carb tuning - too lean! Someone help

[Yamaha4life973]

I got my 06 Yamaha vector and purchased the hauck header and race pipes. Hauck sent me washers to put underneath needle and changed pilot jets to 48. Also they told me to set mixture screws to 2 turns. Also put upgraded springs in carb. It was 35 degrees out and made a few full throttle passes and sled ran.good never missed a beat but checked the ( new) plugs and they were as white as a ghost. and was suppose to go upnorth this weekend any suggestions main jets ? Hauck said previously when he sent me everything that it might need another shim.underneath needle. Can anyone help before I call them in the morning

 

[4strokeluvr111]

I wouldn't run it any more until you get it jetted right. What is Hauck claiming for HP gains?

 

[Yamaha4life973]

He told me 6-7 with the header and only with the header the race pipes 6-8. Don't know how accurate those claims are

 

[4strokeluvr111]

He told me 6-7 with the header and only with the header the race pipes 6-8. Don't know how accurate those claims are

OK...was just wondering. I'll keep my thoughts to myself on these pipes and Hauck in general.

Good luck.

 

[kviper]

No main jat changes ? All the fuel changes you made so far didn't do much at all for wide open throttle!

 

[4strokeluvr111]

No main jat changes ? All the fuel changes you made so far didn't do much at all for wide open throttle!

Typical Hauck.

 

[maxdlx]

A couple wot passes won't hardly change plug color unless they are 2 mile passes. How many miles total on new plugs.

 

[kviper]

It probably wouldn't be lean enough to hurt anything naturally aspirated any way, just wouldn't make best power.

 

[Metallicat]

It probably wouldn't be lean enough to hurt anything naturally aspirated any way, just wouldn't make best power.

I run the Excell header without any rejet. Stock jetting was recommended with mine. I also doubt you are too lean unless your main jets are obstructed or you're not flowing enough fuel for some other reason.

 

[Metallicat]

Hey, what rpm does the hauck header like to run on top end? I'm right around 9100-9200.

 

[theCATman]

The carb Vectors & Nytros were very lean outa the box. Hence great mileage & clean emissions.

I'd go up at least 2 sizes on the main. Run it for a few miles, not a few hundred feet. Like at least an hour of normal riding, with a few WOT pulls. Then read you plugs.

 

[4strokeluvr111]

The carb Vectors & Nytros were very lean outa the box. Hence great mileage & clean emissions.

Mine must have been one of the engines on the downside of the bellcurve. My plugs always are on the DARK side of brown even at 0F degrees. But I just chose to never mess with them.

 

[herndonp]

Remember when you pull WOT on the machine to hit the kill switch first then release the throttle then pull the plugs hot to check them (do not move machine after WOT run or you will get a false reading). Here is a good video on checking spark plugs properly watch it carefully.He explains what part of the plug to check for jetting ( the base not the porcelain)

Pete

 

[theCATman]

Mine must have been one of the engines on the downside of the bellcurve. My plugs always are on the DARK side of brown even at 0F degrees. But I just chose to never mess with them.

Really. My 06 Nytro was lean. I did buy it used, maybe previous owner was into the carbs??? Who knows. I never checked jet sizes, just cleaned them every fall. All I know is it was lean. Not dangerous I'm sure, but I had to babysit it till it warmed up real good & the plugs barely had color.

Once good & warm, it ran fine.

Sent from my SCH-R970 using Tapatalk

 

[Metallicat]

They seem to run lean on the low end when cold, but after watching videos and reading about how to tune and jet cv carbs on motorcycles, I learned that the engine should run like that when cold and properly jetted...at least says some people on the motorbike forums. I don't know about a lean on top end. It would take me an hour or more to pull the plugs on mine!