Full Version: Dynojet Kit Installment
What I want to try and do is not use the Jet size it tells me to use a certain size Jet, but i was wondering if i can use a bigger one than the DJ150 it tells me to use. I kinda want to try putting on another one that came with the Kit like a DJ165 or something, i just don't know what that would affect the Quad, so what i'm asking from you guys is to tell me if it's safe to do what i'm thinking or if i should just keep it as is. here is the website for the instructions to what i did just in case you don't know what i'm talking about: http://www.dynojet.com/pdf/Q312.pdf
You can put in a larger size. I don't think dynojet jet sizes correspond to keihn jets meaning a dynojet 165 won't be the same as a keihn 165. That being said, as long as you are going to a larger size than what the instructions call for, all you will do is richen up that area of the powerband. The main jet you are talking about works from 1/4 throttle to wide open. You can easily go to a 165 however you will not pick up any peformance. You will slightly decrease performance, fuel milage, and response. You won't hurt anything though.
I would not go down a jet size though unless you know what you are doing or want to learn what effects can be had and accept that you may cause significant damage to your engine.
I would not go down a jet size though unless you know what you are doing or want to learn what effects can be had and accept that you may cause significant damage to your engine.
QUOTE (Blaze91991 @ Jul 9 2010, 08:18 PM) 
What I want to try and do is not use the Jet size it tells me to use a certain size Jet, but i was wondering if i can use a bigger one than the DJ150 it tells me to use. I kinda want to try putting on another one that came with the Kit like a DJ165 or something, i just don't know what that would affect the Quad, so what i'm asking from you guys is to tell me if it's safe to do what i'm thinking or if i should just keep it as is. here is the website for the instructions to what i did just in case you don't know what i'm talking about: http://www.dynojet.com/pdf/Q312.pdf
Thank you soo much. I'm also gonna change the Front sprocket so i get more acceleration. that means less teeth on the sprocket right? just making sure.
QUOTE (Blaze91991 @ Jul 9 2010, 08:46 PM)
QUOTE (Blaze91991 @ Jul 9 2010, 08:18 PM)
What I want to try and do is not use the Jet size it tells me to use a certain size Jet, but i was wondering if i can use a bigger one than the DJ150 it tells me to use. I kinda want to try putting on another one that came with the Kit like a DJ165 or something, i just don't know what that would affect the Quad, so what i'm asking from you guys is to tell me if it's safe to do what i'm thinking or if i should just keep it as is. here is the website for the instructions to what i did just in case you don't know what i'm talking about: http://www.dynojet.com/pdf/Q312.pdf
Thank you soo much. I'm also gonna change the Front sprocket so i get more acceleration. that means less teeth on the sprocket right? just making sure.
Yes, but remember that as the front sprocket gets smaller, the chain chain rubs the top slider more. Just something to keep in mind. I'm running one tooth smaller up front on my Raptor 660 and it works well.
So would you recommend a 1 tooth decrease or a two tooth decrease? regardless of the Chain, i can adjust that , or i can use the smaller chain i have.
Dyno Jet jets, like mentioned do not correlate with Keihin mains. Keihin mains are measure in mm, so a 165 main would be 1.65mm in the hole size. Some other brands of jets are measure in flow. Richening a motor will be fine as long as it's not spuddering fat. Most 4 strokes will make more TQ like that anyways. Most of the time the conversion from DJ to Keihin mains is from 8-14 sizes bigger. So your DJ165 would roughly be a 175-178 in Keihin jets.
Always keep the front as big as possible on the sprocket. You will wear out the front sliders and can cause the chain to bind if the countershaft sprocket is to small. So you may have to go up with the rear to gear down like you would like to do.
Always keep the front as big as possible on the sprocket. You will wear out the front sliders and can cause the chain to bind if the countershaft sprocket is to small. So you may have to go up with the rear to gear down like you would like to do.
Going down a tooth on the front sprocket (Smaller) is cool but going down 2 will start eating the chain slider as mentioned above. Going down on the front will give you better acceleration while causing you to shift into second sooner and decreasing your top speed by about 5mph. If you never get into top gear or feel that you can't accelerate in top gear, going down a tooth on the front sprocket will usually get you the gearing change you need. If you need more, you would be better off going to a bigger sprocket on the rear or a combination of both sprockets. Going larger by 3 teeth on the rear = going smaller 1 tooth on the front, roughly.
What kind of quad do you have?
What kind of quad do you have?
QUOTE (Fireballsocal @ Jul 10 2010, 12:31 PM)
Going down a tooth on the front sprocket (Smaller) is cool but going down 2 will start eating the chain slider as mentioned above. Going down on the front will give you better acceleration while causing you to shift into second sooner and decreasing your top speed by about 5mph. If you never get into top gear or feel that you can't accelerate in top gear, going down a tooth on the front sprocket will usually get you the gearing change you need. If you need more, you would be better off going to a bigger sprocket on the rear or a combination of both sprockets. Going larger by 3 teeth on the rear = going smaller 1 tooth on the front, roughly.
What kind of quad do you have?
What kind of quad do you have?
I have a Suzuki LTZ 400.
You should be fine with going one smaller on the front sprocket.
QUOTE (Fireballsocal @ Jul 9 2010, 10:40 PM)
You can put in a larger size. I don't think dynojet jet sizes correspond to keihn jets meaning a dynojet 165 won't be the same as a keihn 165. That being said, as long as you are going to a larger size than what the instructions call for, all you will do is richen up that area of the powerband. The main jet you are talking about works from 1/4 throttle to wide open. You can easily go to a 165 however you will not pick up any peformance. You will slightly decrease performance, fuel milage, and response. You won't hurt anything though.
I would not go down a jet size though unless you know what you are doing or want to learn what effects can be had and accept that you may cause significant damage to your engine.
I would not go down a jet size though unless you know what you are doing or want to learn what effects can be had and accept that you may cause significant damage to your engine.
Interesting.
06 YFZ450
Baffle out, Lid Off, Pro Design Air Filter, 600ft sea level.
I just went with a Keihin jet kit, 170, 45, NCVQ on the fourth clip and 1.5 turns. It seems to be running really well.
How much different is a dyno jet compared to keihin? I have not taken the test ride yet.
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