Dynojet Vs. OEM jets

[croach1]

When I rejetted my bike the jet kit I ordered did not have the dynojet 134 and 138 jets I wanted. I went to the dealer and they insisted the jet sizes from one brand to another was the same so they sold me OEM 135 and 137.5 jets. My understanding now is that the sizes are not even close to the same. Evidently these would be closer to dynojet 144 and 146.

I guess my question is, should I go ahead and get the Dynojet 134 and 138 in the bike? I have had some bluing issues on my pipes, would changing these make that better or worse?

[navillustoo]

Croach1,
I can't say better or worse, RIGHT would be the operative word here! If you need a Stage3 kit, the Dynojet 134 & 138 are the only jets that will get you there. Even if you were to measure the diameter of the hole through the jets and got jets of equal size, you still may not have the right jetting. The Dynojet jets are measured and sized by flow amounts, not hole size. I'm not sure how Keihin sizes their jets, but Dynojet claims theirs are sized by flow volume.
Dynojet sells individual jets for about $2.00 a jet, check out their site:
http://www.dynojet.com/jetkits/jetassortment.php

Hope this helps!

P.S. Looking at your avatar pic, I don't know why you'd want those large jets in the first place, have you installed a TAK since the pic was taken?

Brian

[RAZOR]

could not help in the jet department man-sorry but sombody will be able to.
sound like the dealer just wanted to make a sale.

[Mr.Sinister]

Factory Pro is a great place to buy from .They have the best customer support and when I bought a kit from them it got here in 2 days . They will tell you what you need if you tell them your setup .I will post a link .

[gone28]

hey , carb boy , i have aquestion for you also .Cruiser performance has thier bootleg intakes again and wanted to get one and do the bean box mod also.Which jets and what company?
steve

[croach1]

I have the Dyno 134 and 138 now so I can install them. I just wasn't sure if this was something that would help since from what I have read the jets I have in are probably to large for my application. From what I see changing to the Dyno would actually cut back on the flow a little from what I have in now.

I have not installed a TAK but the airbox has the complete bean box mod so I have much more air flow than the stock airbox.

[Mr.Sinister]

hey , carb boy , i have aquestion for you also .Cruiser performance has thier bootleg intakes again and wanted to get one and do the bean box mod also.Which jets and what company?
steve
I don't think you can do both ?

[gone28]

hey , carb boy , i have aquestion for you also .Cruiser performance has thier bootleg intakes again and wanted to get one and do the bean box mod also.Which jets and what company?
steve

[croach1]

I talked to the guys down at Dynojet and they set me straight. I think I will yank the carbs and change out the jets again. I should know better than to get in a hurry and trust what the dealership tells me.

[navillustoo]

Croach1,
I 'm not familiar with the bean box mod, but unless it flows as much air as a Thunder Air Kit, the 134 & 138 jets will probably be too big as well. The guys on here that have a Tornado or Hurricaine TAK are running 134's & 138's. As I understand it, these flow more air than anything else available for the 750 engines. You'll know fairly quick if you're still too rich, take a plug reading and see how they look.

Brian

[navillustoo]

hey , carb boy , i have aquestion for you also .Cruiser performance has thier bootleg intakes again and wanted to get one and do the bean box mod also.Which jets and what company?
steve

gone28,
I'm not sure what you're asking me! I don't know anything about Cruiser Performance's bootleg intake, what comes with it as far as air filter configuration. How it flows compared to TAKs. The altitude where you ride, these are things I'd have to know before I could even take a guess what jetting you would need. I would have to think that any entity manufacturing performance parts, would have a recommended set-up for the product they're selling. Have you inquired what their recommended jetting is for their intake?
As far as the jet kit company goes, Dynojet has more kits available for more applications than Factory or anybody else. From what I've seen, Dynojet's kits can be had for less $$ than Factory's also. My vote is Dynojet.

Brian

[HSGear]

The airflow increase, especially without bigger pipe diameters, is probably the cause of high heat, and heat is what blues pipes. If you ran HardKrome's, you'd probably be OK.

[croach1]

The airflow increase, especially without bigger pipe diameters, is probably the cause of high heat, and heat is what blues pipes. If you ran HardKrome's, you'd probably be OK.

I would like to get some HardKrome Kickers for my bike, but that is a little more than I have to spend right now. I have the 2" Cobra drags pipes on without baffles so I should be able to move good air out the exhaust.

I changed the jets last night to the dynojets and will just have to check the plugs to see if I am running to rich. I may go ahead and order a 130 jet so I can change to 130/134 on the jet size if I am running rich. I am getting pretty good at taking all of that apart and putting it back together so from starting the job to riding the bike again only takes about an hour. I may try several jet and needle combinations to get the bike running it's best.

I have been wanting a TAK so maybe I should just change that and keep the jets I have in there.

[croach1]

I ran with the new jets last night and I am getting some poping when I decelerate. Wouldn't that mean I am running lean, or can it do that on a rich mixture also?

[llamakc]

Popping on decel means you are running lean. You fix that by adjusting the Air/Idle Mixture screw(s). I've been learning ALOT about this lately myself.

[navillustoo]

I ran with the new jets last night and I am getting some poping when I decelerate. Wouldn't that mean I am running lean, or can it do that on a rich mixture also?

Croach1,
It means the idle circuit is lean. That's not to say that the engine is running lean throughout the entire RPM range. On the contrary, if you rejetted, your engine won't be lean off-idle, just lean in the idle circuit. I don't know where you set the mixture screws, but if you followed the instruction sheet and set them at 2-1/2 turns out, you will most likely be lean at idle. Try backing the screws out 1/4 to 1/2 turn at a time, but do not exceed 3-1/2 turns out. If the popping still persists at 3-1/2 turns out, you can raise your float levels slightly to compensate. This will richen the idle mixture enough to set your screws at about 2-1/2 turns out. Regardless of where you end up with the screws, if you removed the plug covering the screws, put a glob of silicone over the screws when you finally get them adjusted to where they want to be. This will keep them from vibrating and backing out. Some have reported loosing their screws because they were backed out too far and there was nothing to keep them from falling all the way out.

Good luck!

Brian

[croach1]

Thanks for the tips. I will work with the mixture next weekend. I have my girls this weekend. I pulled the plugs and checked them and they look pretty good. No sign of a rich mixture for sure. I am getting popping but not getting backfire except very occasionally so I am guessing the mixture is fairly close. Who know's, the bike may actually be right and this is just my way of doing things on it until I can afford the next mod.

[UncleFestes]

The Dyn Jet is nothing but a hose connected to where there is fuel. when the vacuum to the ports are opened it is going to pull fuel into the intake ports can't help but do this nothing controls this except the restriction in the fuel tube.. I feel that this is a scam like the other favorite one of mine the Power commnader at only $ 300 bucks to cure your Eletronic fuel injection problems on your VTX . It can only Richen the fuel mixture by holding the injector open for a 1000 of a sec longer... They told me I needed this. I bought a empty box for $270.( thats another story) so I had to do something else. bad popping on decel... woe what is the smog device .. Oh when the engine is slowed a blade valve opens and allows air to enter the exhaust port.. fresh air raw gas causes Popping.. Removed the smog device and solved all my problems.. I was running Vance and Hines Big Shots.. Never a lean problem.
none on the Sabre either. but can and won't mess with the air box, Filter or Jets So tell me why I need bigger jets in this land of florida... best way to check your plugs is to run about
5 miles and pull the clutch and hit the kill switch at the same time.. coast to a stop and pull a plug.. If it is lean it will be white.. if there are metal droplets on it from the piston then we know it is tooooo lean..also it has been knowen to melt the ground electrode almost off.. I got to do a roll on with someone in 2nd gear with all the mods to really see how mine is running.. any takers.??