upjet?
Thread Starter
Member
Squid
Joined: Oct 2012
Posts: 82
From: Chicago
upjet?
I got a 98 Superhawk wirh 6000 miles all stock. I am putting on Two Brothers Vale M2 exhaust on today and purchased a dynojet stage 2 kit.
I called a dealer to set up an appointment for jetting the carbs. They told me to return the jet kit because it will need upjetting, not rejetting. Can anyone shed light on this and tell me if this process would be advised or not?
Thanks!
I called a dealer to set up an appointment for jetting the carbs. They told me to return the jet kit because it will need upjetting, not rejetting. Can anyone shed light on this and tell me if this process would be advised or not?
Thanks!
Senior Member
MotoGP
Joined: Jul 2010
Posts: 3,871
From: Phoenix, AZ
Yeah I know all about that. Up jetting is a common practice in which one decides to switch dealers because the first one spits out gibberish.
In all actuality, though, you may want to go through some of the "carb setup" threads on here before you throw a bunch of money into your bike. I'm pretty sure that what your dealer is talking about is using bigger main jets, which the Dynojet kit includes anyway. Your bike will be fine until you figure out exactly what to do. There is no rush, as aftermarket slip-ons have relatively little effect on your jetting. You won't damage anything and it won't run terribly. Once you do a little bit of planning, you can tune them in properly.
In all actuality, though, you may want to go through some of the "carb setup" threads on here before you throw a bunch of money into your bike. I'm pretty sure that what your dealer is talking about is using bigger main jets, which the Dynojet kit includes anyway. Your bike will be fine until you figure out exactly what to do. There is no rush, as aftermarket slip-ons have relatively little effect on your jetting. You won't damage anything and it won't run terribly. Once you do a little bit of planning, you can tune them in properly.
Administrator
MotoGP
Joined: Apr 2006
Posts: 4,402
From: Kempner, TX
What he said ^^^^
And please find a new shop to take it to... that one is either screwing with you or ignorantly providing you nonsense for information.
“Upjetting”
, sure, let’s do that. (ok I suppose a third possibility is “upjetting” is a local term and the shop means well, and knows what it is talking about.. but ya have to wonder. They did get the send the DJ kit back part right though….LOL..)
And please find a new shop to take it to... that one is either screwing with you or ignorantly providing you nonsense for information.
“Upjetting”
, sure, let’s do that. (ok I suppose a third possibility is “upjetting” is a local term and the shop means well, and knows what it is talking about.. but ya have to wonder. They did get the send the DJ kit back part right though….LOL..)
Administrator
MotoGP
Joined: Apr 2006
Posts: 4,402
From: Kempner, TX
The DJ kit requires you to drill the slide, regardless of "stage" and I just spent an hour fixing a drilled slide.... Some may get good results with the DJ kit, but I never did after several Dyno tuning sessions
Senior Member
Superstock
Joined: May 2012
Posts: 397
From: UK
I'm not talking about the slide hole and I have never had good results with these bike by drilling an extra slide hole.
The OP mentioned stage 2 not 1. IIRC I think stage 2 Dynokits require making the main air jet at the top of the carb larger. The same air jet that flo commanders connect to.
(:-})
The OP mentioned stage 2 not 1. IIRC I think stage 2 Dynokits require making the main air jet at the top of the carb larger. The same air jet that flo commanders connect to.
(:-})
Administrator
MotoGP
Joined: Apr 2006
Posts: 4,402
From: Kempner, TX
I'm not talking about the slide hole and I have never had good results with these bike by drilling an extra slide hole.
The OP mentioned stage 2 not 1. IIRC I think stage 2 Dynokits require making the main air jet at the top of the carb larger. The same air jet that flo commanders connect to.
(:-})
The OP mentioned stage 2 not 1. IIRC I think stage 2 Dynokits require making the main air jet at the top of the carb larger. The same air jet that flo commanders connect to.
(:-})
http://www.dynojet.com/pdf/1185.pdf
...and it talks about "stage 1"
(a term I hate as it has no standard and not consistant) but there is no listing on Djs catalog of a "Stage 2" kit for the VTR Dynojet Jet Kits - Offering Motorcycle Jet Kits & ATV Jet Kits
Thread Starter
Member
Squid
Joined: Oct 2012
Posts: 82
From: Chicago
almost all good
Thanks guys! I had never heard this term "upjet" and is sounded suspect. The bike runs smooth through the rpms with the Two Brothers exhaust. The only issue is a little backfire when I let off the throttle. So it probably just needs a little adjustment. I will read the treads on that as suggested.
Thanks for the speedy responses. Oh and, appointment cancelled.
Thanks for the speedy responses. Oh and, appointment cancelled.
Senior Member
MotoGP
Joined: Jul 2010
Posts: 3,871
From: Phoenix, AZ
Popping on deceleration is fairly common on these bikes, and can be alleviated by removing the Emiisions PAIR, balancing the carbs, and many have found switching to a size 48 pilot jet (the backfire being slightly lean from the stock size 45 jets) helps.
You'll find this in reading I'm sure!
You'll find this in reading I'm sure!
