Hey guys, I'm going to be taking my bike up to Denver to do some riding while I visit family. Normally I ride at or below sea level, and that is what I'm tuned for now. Any recomendations for how many turns out on the metering rod I should try? I know it will take some tweaking, but maybe just an estimate of how many turns. I'm going to try HPR too, but I figured I'd try you all first. Thanks for any recomendations.

FH

 

Depends on the needle you are using. We run a hpr 1-5 at around 2inches out if I am not mistaken. Somewhere between a 20-60 pj aswell. Good luck.

 

it has been said manya times on the forums that no tuning is necesary for going up in altitude on a lectron. I've often wondered if that is really true, but no experience here to comment on.

fyi - humidity makes just as much difference as altitude, and so does temperature. it is possible for even a jetted carb such as a mikuni to need no changing for altitude, if the temp and humidity are different enough to offset it. I have ran into this many times. if its hotter, the carb gets richer, cooler and she goes lean; if its more humid the carb goes richer, less humid and it goes lean; up in altitude and it richens, down in alt and she leans. if I go from sea level to 5K this would be about 3 main jet sizes for my carb, but if the humidity went from 80% in indiana to 20% in utah in that same elevation change this is about two jets the other way, and providing temp was the same I would only be dropping 1 main jet size.

 

HT, that all makes good sense... so I guess I'll be taking a couple sets of plugs and start by messing around until I find something that feels nice.

Viper, I am also running a 1-5... I'll measure to see where I'm am now, and try your measurement... what is your altitude BTW?

 

Its a lectron......enough said.


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I didn't read any of the other responses except the informative one right before mine because I am really short on time today, but here is what I would do....

Start it up when you get there and see how it does. My guess is you will settle on somewhere between a half turn and a full turn out.....remember you can do 1/4 turns with these metering rods.

I am hoping you have the dual powerjet setup with one of them being adjustable. Put a small one in the fixed powerjet like a 10 or 15 if it isn't that way already and plan on using your adjustable to dial in. Close the adjustable off completely then run it up to the top end. Stop and open it a half turn or so, try it again keep doing this until it feels right.

If you start with a half turn on the metering rod and the bike runs the best with a 10 powerjet and the adjustable closed off, you might try to lean the metering rod another 1/2 or quarter turn..........then see if motor wants the adjustable powerjet opened up a little. As long as you don't get a lean bog on the bottom end you will run faster being able to run a little more fuel through the powerjets on the top end.

My $0.02

Good Luck! [img]i/expressions/face-icon-small-smile.gif[/img]

 

Holly, with that needle do exactly what nut said, and you will get her close. The dunes here start at the 4600' level and go to just over 5100'. So you will be close.

 

Here you go Holly. First off, your current tuning state is critical. If you are spot on now, you may not need anything at all.

If you are one way or the other, you may need a bit of a turn on the current needle you have in place.

I run a 4/1 now and used the same set up at Pismo. I actually turned the idle up a bit when I got there. That small change was all that was needed however I did play with the needle a bit. I acutally went a scratch leaner with the needle (out from the slide) but there was no real seat of the pants difference. I'm sure that I could have been even closer with a little dyno tuning but it was pretty much on.

I live at 2200 - 2300 and am at Dumont (sea level) and Coral Pink (6000) regularly. Nothing has to change for me. If you need a change at all, it's probably because your are just that much off (a squinch) where you are at now.

My .02, good luck.

 

As long as I have been reading these forums there has been a question about whether you need to adjust the Lectron at different elevations.

The fact is, there is more than one issue to consider. Not the least of which is the catagory that a rider falls in. Are you a total motor head that has to have everything dialed spot on with no margin for error? Or on the other extreme, do you want your carburator to act like fuel injection because you don't know how to tune one, you don't want to know how to tune one.....you just want it to work when you want to use it.

Most of us fall somewhere in between........

My comment reflected how I do things and it really bugs me to leave even a little horsepower on the table. It will bug me until I fix it, lol.

The Lectron is a good choice for a lot of people because you can be quite a ways off in either direction and the motor will run smoothly. It is deceiving and makes it difficult to tell if you are sacrificing power or not. Most carbs will let you know in no uncertain terms which way you are off and that they are not going to run right until you get them dialed in. Once dialed, they work really good for carburation.

The Lectron has gotten the reputation for being flexible because a rider with little tuning experience and a Lectron can go from sealevel to 5000' with a buddy who has a Mikuni. The guy with Mikuni starts his bike up and it starts ok but it feels a tad sluggish on take off then it blubbers when you get into the throttle because the Main jet is too big. The pilot and the needle are closer so it is really wide open that is bad. The guy who has the Lectron notices a little power loss but chalks it up to elevation and motors off because there is no blubbering and dramatic power loss.

Now that is not to say the Lectron is optimally tuned at this point. It is not. It is rich to but it hides it better. Since I am nitpicky about this sort of thing with my bike, I will know that the Lectron can be leaned a bit and it will clean up and yield a bit more performance so I go ahead and take the time and tune it a bit.

If you are a tuning fanatic read Jed's and my response. If you are just there to ride and have fun, read what Bigdaddy has to say and you will be much happier and it will work remarkably well. Both view points are true but they are each talking to different types of people.

Hopefully this sheds a little light on the question as to whether the Lectrons do or don't require tuning with significant elevation changes.

Ron

 

Awesome, thanks guys... I may be a touch lean right now so there may not be too much to do except a little dial in.... Anyway, I appreciate the suggestions.

On a side note its great to see you back Big Daddy. Don't let the riff raff get you down.

Holly