Anybody tried using dial a jet ?

[Buckaroo Banzai]

I was wondering if anyone has used dial a jet on the the dr650. A friend of mine said a bunch of 4 wheelers use it and they love it.

It might come in handy if it actually works like it said it does.

I just bought a new dr650 and I'm going to rejet it, I just don't know if I'll try the dial a jet.

[Colorado Ron]

Talking about these?

http://users.metro2000.net/~cdc/magn...%20a%20jet.htm

[GodSilla]

That dial-a-jet is some seriously weird shit.
Your friend might have good intentions, but a properly set up carby won't give you any trouble, whereas I suspec the DAJ will give you grief at some stage, if not forever.
Feel free to try it though and let us all know if it was worth it.

[Buckaroo Banzai]

Originally Posted by GodSilla

That dial-a-jet is some seriously weird shit.
Your friend might have good intentions, but a properly set up carby won't give you any trouble, whereas I suspec the DAJ will give you grief at some stage, if not forever.
Feel free to try it though and let us all know if it was worth it.

I'm going to go the route and just rejet. Althought, if you ride in higher altitudes the dial a jet will compensate for the altitude change whereas a manual jet change will not work for you.

I was just wondering if anyone had tried it yet on a dr650se and what the results were.

One of the places we ride is the Cherohala Skyway which is over 5,000 feet high. The dial a jet might be worth having in that situation

[fullmonte]

Originally Posted by Buckaroo Banzai

One of the places we ride is the Cherohala Skyway which is over 5,000 feet high. The dial a jet might be worth having in that situation

You can be the guinea pig. BTW, my jetted DR does just fine on the Skyway, or Fire Road 81 for that matter.

[BenS.]

I always thought Dial-a-jet was a crutch for people who didn't know crap about carb tuning

[Max Kool]

Why mess with jets outside the carb, when you have a perfect place inside the carb for them? Mikuni did the work for you. If you want to compensate for higher altitudes simply blank off half the opening of the snorkel you have previously pulled out of the top of the airbox.

[Spode]

Originally Posted by BenS.

I always thought Dial-a-jet was a crutch for people who didn't know crap about carb tuning

+1

[LILBIT]

Originally Posted by BenS.

I always thought Dial-a-jet was a crutch for people who didn't know crap about carb tuning

The idea is being able to tune for temps and altitude changes without touching the needle or brass. Face facts-some bikes are such a PITA to get to the carb road side changes are a bad idea. If mounted in a good spot it can be reached with a screw driver. I've only spoke to one person who has tried it. He claimed the adjustment level was limited. More ultra fine tuning than he was after. On a two stroke with a picky rider it might be worth while. I've considered it but got by making half clip needle changes.

[potatoho]

Four strokes respond well to better atomization. The dial-a-jet is a bit awkward to install, and I did try it on my four stroke but I did the airboot mount which did not have enough signal. That was on my KTM LC4, so on your DR650 likewise you would probably not have good effect with an airboot mount. It's too far from the bore.

There are some aftermarket emulsifier tubes. One I tried on an HSR42 carburetor, is called the yost power tube (yostperformance). That thing worked very well to improve the throttle response. Too bad he only makes them for a few models.

[Ghoti]

Originally Posted by BenS.

I always thought Dial-a-jet was a crutch for people who didn't know crap about carb tuning

There's an article in I think Dirt Rider, not sure if that's the one, about an engine builder who swears by them. He had built a KTM300 and a 525 for a 24 hour race. Sorry I'm so vague, I'll have to look when I get home.

[ChrisC]

Originally Posted by Max Kool

Why mess with jets outside the carb, when you have a perfect place inside the carb for them? Mikuni did the work for you. If you want to compensate for higher altitudes simply blank off half the opening of the snorkel you have previously pulled out of the top of the airbox.

So a reduction in airflow into the airbox leans the mixture at altitude exactly how?

[onaXR]

Originally Posted by ChrisC

So a reduction in airflow into the airbox leans the mixture at altitude exactly how?

Busted.

[Max Kool]

Eeehh I guess I meant opening it up even a little more (higher altitude, less oxygen, richer mixture, yes you're right fellows).

[kdxkawboy]

A four stroke with a CV carb is about the best of all worlds. For competition, or real serious dirt work the CV carb has some problems in the fact the slide will bounce up and down a bit in the rough terrain. But the CV carb provides a bit of natural compensation for changes in altitude.

Most my life I've lived at a coupld 100 feet shy of 5000'. Living in Nevada thats the base level of most the valley floors so I'm usually riding at higher elevations. I've jetted my CV carbed KLR for 6000'. DOn't notice any real problems until I start getting up above 12,000' and she runs like a bat out of hell down at sea level with minimal changes to the throttle.