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Dynojet Stage 1&3 Jet Kit - 4138

  • Part #: 171909
  • Manufacturer Part #: 4138

MSRP Price: $125.95

Our Price: $113.36

You Save:
$12.59 (10%)
1 on Hand

Overview of Dynojet Stage 1&3 Jet Kit - 4138

  • Specifically for motorcycles with stock engines using stock airboxes, air filters and stock or aftermarket exhaust systems
  • Adjust to allow for the use of well-designed aftermarket exhaust systems and stock replacement air filters
  • Get better throttle response and driveability
  • Expect power increases of approximately 5 percent throughout the power range

Included Items:
(16) Main jets(4 ea. -098,102,128,132)
(4) Fuel needles
(4) Adjusting washers
(4) E-Clips
(1) Slide drill
(1) Plug drill
(1) Screw

The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.

Specs for Dynojet Stage 1&3 Jet Kit - 4138

Type Jet
Type - Carburetor Jets Main Jet
Units Kit
Weight 0.37 lbs

Specs for Dynojet Stage 1&3 Jet Kit - 4138

Type Jet
Type - Carburetor Jets Main Jet
Units Kit
Weight 0.37 lbs

Fitment for Dynojet Stage 1&3 Jet Kit - 4138

See if this part fits your ride

Part 171909 fits the following machines

Yamaha
  • 1998 Yamaha XJ600S Seca II
  • 1997 Yamaha XJ600S Seca II
  • 1996 Yamaha XJ600S Seca II
  • 1995 Yamaha XJ600S Seca II
  • 1994 Yamaha XJ600S Seca II
  • 1993 Yamaha XJ600S Seca II
  • 1992 Yamaha XJ600S Seca II
5.0 / 5.0
18 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
18
0
0
0
0
Fit
5.0 / 5
Quality
5.0 / 5
Style
5.0 / 5
Value
4.7 / 5
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Well worth it!
After installing the kit in my bike, I gained 3000 rpm on the top end. Kit is very complete, with instructions that are very good. Would recommend this to anyone.
August 5, 2010
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Well worth it!
After installing the kit in my bike, I gained 3000 rpm on the top end. Kit is very complete, with instructions that are very good. Would recommend this to anyone.
August 5, 2010
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
4 / 5
Tuning for dummies
I'm no bike mechanic. I'm fairly inept at most things, in fact. I'm pretty sure I'm wearing mismatching socks.

I will not take this space to complain about how the japanese motorcycle manufacturers used screws that were made out of butter on 70's and 80's bikes, I will use it to sing the praises of Dynojet, because they make a fantastic product. I've heard horror stories of plug chops and air correctors and weekends of trial and error to get "close" to perfect. With the Dynojet kit, based on my bikes current modifications, I was able to do all that trial and error in one shot.

My bike has improved throttle response, increased power and oh my God that sound. I DO still have a bit of fine tuning to do, but I believe it could be ridden indefinitely as it currently sits.

The one thing I would suggest, is that if you have access to one, use a drill press and some type of jig to bore out the slide lift holes as per the instructions. Doing so by hand is possible, and it's what I had to do, but you could ensure a nice, even bore with a drill press.

The kit is a bit spendy, but it saves you so much in time and frustration that it is still worth the four stars, and I will buy another one when needed.
February 3, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Jetted and ready to roll
worked good with pods and full ex system did stage 3 and did set it per instructions and started right up good throtle response. I may do 1/2 turn on the air screw but is seams very good.
May 18, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Jetted and ready to roll
worked good with pods and full ex system did stage 3 and did set it per instructions and started right up good throtle response. I may do 1/2 turn on the air screw but is seams very good.
May 18, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
4 / 5
Tuning for dummies
I'm no bike mechanic. I'm fairly inept at most things, in fact. I'm pretty sure I'm wearing mismatching socks.

I will not take this space to complain about how the japanese motorcycle manufacturers used screws that were made out of butter on 70's and 80's bikes, I will use it to sing the praises of Dynojet, because they make a fantastic product. I've heard horror stories of plug chops and air correctors and weekends of trial and error to get "close" to perfect. With the Dynojet kit, based on my bikes current modifications, I was able to do all that trial and error in one shot.

My bike has improved throttle response, increased power and oh my God that sound. I DO still have a bit of fine tuning to do, but I believe it could be ridden indefinitely as it currently sits.

The one thing I would suggest, is that if you have access to one, use a drill press and some type of jig to bore out the slide lift holes as per the instructions. Doing so by hand is possible, and it's what I had to do, but you could ensure a nice, even bore with a drill press.

The kit is a bit spendy, but it saves you so much in time and frustration that it is still worth the four stars, and I will buy another one when needed.
February 3, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Acceleration
I am very pleased with the performance of my bike now that I have the stage 3 kit installed. It runs different and took some getting used to, but I'm happy with the outcome
April 20, 2010
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Best jet kit
Very good jet kit really easy to instaill got my buddie to get one too
July 1, 2011
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Made the bike run as it was supposed to, fast!
With a K&N filter (removed the filter box cover also), opened up aftermarket pipes, and this jet kit I made a real hot rod out of my Vulcan 500. Throttle response was also dramatically improved. You don't have to remove the carbs from the engine to do jet work on the EN500. The size of jets you use depends on your elevation. You also need to put in bigger pilot jets from the Harley catalog. I put in #42 pilot jets, #130 mains. Place your needle clip at the bottom groove to prevent surging when cruising. My elevation is 1000 ft. Do it right and you'll have a new bike.
October 9, 2009
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Supersonic
I would recommend Dynojet over other jet brands as this is not the first kit we have messed with. Bike runs much smoother now and has a noticeable power increase across most of the RPM range. Max rpm also increased by about 500. Don't drill out the slides unless you have to though. I used this kit on a 1983 Yamaha Midnight Maxim 750cc.
April 8, 2012

Instructions and Manuals for Dynojet Stage 1&3 Jet Kit - 4138

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