February 5th, 2011, 02:44 PM | #41 | |
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Quote:
buy some larger main jets equivalent to Keihin 110 or 112s. You may need to go up or down later according to your needs, but that's a good starting point. |
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February 5th, 2011, 03:54 PM | #42 |
ninjette.org member
Name: Aaron
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main jets
Do I need to drill anything for installing bigger Keihin 110+ main jets?
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February 5th, 2011, 03:56 PM | #43 |
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kkim, what are you using for the crankcase breather with that k&n setup?
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February 5th, 2011, 03:57 PM | #44 |
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February 5th, 2011, 04:00 PM | #45 |
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February 5th, 2011, 07:04 PM | #46 |
Moroccan Gold Imports
Name: RJ
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I bought a $9.99 breather filter at O'Reilly's (universal). It didn't quite fit the crankcase hold, so I dremeled it out and it fit fine.
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February 5th, 2011, 07:20 PM | #47 |
ninjette.org member
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Sorry I just realized where I read about drilling -- that was from the dynojet kit which says to drill out the fuel mixture screw plugs so you can set the underlying screws at 3 turns outs.
So I am a little confused -- it looks like there are 4 parts involved with the "main" jet: (1) the "needle" (2) the "needle jet" (small brass cylinder part that just slips over needle) (3) the "needle jet holder" (sits on top of the needle jet and screws in to carb) (4) the "main jet" (screws into needle jet holder) Looking at the dynojet kit, for each carb, it has one needle and several main jets (94, 96, 98, 100). I.e, it supplies parts (1) and (4) above only [not parts (3) and (4)]. Well, that and some small clips and washers. So my question is this: if I want to "build my own jet kit", does that mean I just need to buy a "needle" and "main jet" [parts (1) and (4) above] Or do I also need to buy parts (2) and (3). If so, why does dynojet not supply them. Judging from what supplied in the dynojet kit, it seems like the OEM parts (2) and (3) can be re-used for different size needles and main jets? But the dynojet kit came with one needle which can work with the 4 different main jets they supply (94-100). Why didn't it come with 4 needles instead of just one? Or why didn;t it just reuse the OEM needle? Basically, if I pick up 110, 112 and 115 Keihin "main jets", do I need to buy a needle (or needles) as well? What about the "needle jet" [part (2) above] and "needle jet holder" [part (3) above]? Apologies for my confusion. Last futzed with by afbarr; February 5th, 2011 at 07:23 PM. Reason: clarifying |
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February 5th, 2011, 07:46 PM | #48 |
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what you are paying for in a jet kit are the proprietary needles that they supply. They are not OEM type needles and companies source their needles according to how they want the bike to run. The pilots and main jets you get can be purchased from any place that sells Keihin jets.
have you read these on rejetting your bike? http://faq.ninja250.org/wiki/I_want_...uretor_jetting you'll find the needles that come with our bikes are lean from the factory (in addition to being different left and right). selecting your own needles would require a lot of guess work/R&D which the jet kit companies have already done for you in selecting their needles. |
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February 5th, 2011, 07:48 PM | #49 |
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Shimming w/ washers would be cheaper than buying new needles/jet kits no?
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February 5th, 2011, 07:49 PM | #50 |
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yes, but not as accurate or nearly as adjustable.
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February 5th, 2011, 07:54 PM | #51 |
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Sandpaper + micrometer
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February 5th, 2011, 08:09 PM | #52 |
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February 5th, 2011, 08:54 PM | #53 | |
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Name: Aaron
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Quote:
I need to learn more about carbs... I'll check out the site you recommended. |
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February 5th, 2011, 09:21 PM | #54 |
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if you have removed the airbox and are using pods/open filter, yes you will. look at Factory pro and the kit they have for bikes w/o an airbox. use the jets sizes they supply and cross reference the Dynojet sizes for jets you should purchase for use.
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February 6th, 2011, 12:11 AM | #55 |
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I've only found conversion charts for Keihin <--> Dynojet <--> Mikuni. I have not seen a FactoryPro comparison against any of the above. I guess I could pick up the Keihin equivalent of Dynojet 102 and up (since I already have Dynojet 100).
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February 6th, 2011, 12:12 AM | #56 |
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I already made the mistake of making this assumption. FP size codes = Keihin size codes. Source = FP.
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February 6th, 2011, 12:48 AM | #57 |
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February 6th, 2011, 10:01 AM | #58 |
ninjette.org member
Name: Aaron
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Well, I could just not install the Dynojet stage 2 kit (that was given to me) and instead just pick up some 110 and 112 Keihin main jets from jetsrus. If so, would I just use the stock needle and main jet holder that came with the cvk30 from the factory?
Or does using the Dynajet or FactoryPro needle with the Dynojet or FactoryPro main jets really make that big of a difference compared to equivalent main jet sizes from Keihin? Is the "big deal" about the Dynojet kit the fact you get a proprietary needle with grooves that makes it easy to "shim" up or down with an e-clip? |
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February 6th, 2011, 10:38 AM | #59 |
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The big deal about any aftermarket jet kit is the selection (taper) of the needles they provide/select, which control the fuel flow to improve (richen) midrange performance, which a stock bike lacks.
yes, you can use the proper/equivalent Keihin main jets w/ your DJ needles. |
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February 6th, 2011, 02:20 PM | #60 | |
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Quote:
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February 6th, 2011, 03:06 PM | #61 |
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from what we've experienced, those should cover the range you'll need to properly jet the mains.
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February 6th, 2011, 03:29 PM | #62 | |
ninjette.org member
Name: Aaron
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I also ordered the uni 104 filter for the crankcase breather vent. The block off plate arrived on Friday! and I installed it yesterday. I think half of the reason I'm doing all this is to just simplify the morass of tubing underneath the tank! let alone try to improve performance a little. |
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February 6th, 2011, 03:33 PM | #63 |
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Aaron,
I can assure you, once you get the engine tuned properly, the money invested to do so will seem inconsequential. Yes, it may cost a few bucks to get to that point, but the knowledge and understanding you gain of what those little pieces do inside the carbs and how they improve the engine output is priceless. |
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February 6th, 2011, 04:54 PM | #64 |
Fighting Texas Aggie '05
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That does look alot cleaner
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February 8th, 2011, 09:18 PM | #65 | |
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Name: Aaron
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Quote:
I assume you want the tip of the needle to be as far away from the main jet as possible? When I installed the dynojet needle I think I did the opposite (I didn't think about this until today). I put the e-clip at the first notch at the top of the needle (the bluntest end of the needle opposite the main jet side). I also stacked the two washers on top of the needle assembly/diaphram (inside the white plastic spring cup). Was I supposed to place the eclip as far down the needle (toward the pointy end) as possible? This makes sense to me but I just want to verify with the more carburetor tuning savvy folk here Do I use the washers at all when doing this? Last futzed with by afbarr; February 8th, 2011 at 09:20 PM. Reason: typo |
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February 8th, 2011, 09:43 PM | #66 |
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http://faq.ninja250.org/wiki/How_to_...e_your_jetting
once you select the proper main, start with the e-clip in the middle position on the needle, then work from there. FP needles next to stock needles... e-clip on FP needle on the 3rd clip position w/ washers stacked above it. |
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February 8th, 2011, 09:51 PM | #67 |
ninjette.org member
Name: Aaron
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Ahh... so you sandwich the washers between the e-clips? That makes sense now I will move the eclip to the third notch and place the washers on top and then put the second eclip on top of them. Do the washers act as spacers or as weight? I will read the link you sent. I also order the Haynes Fuel Systems book and that should arrive soon
Thanks for your help! |
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February 8th, 2011, 09:52 PM | #68 |
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Deleted due to redundancy.... Kelly said it better.
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February 8th, 2011, 10:21 PM | #69 |
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The washers above the e-clip are supposed to act as weights on the needle to keep it from vibrating and shifting up and down while the bike is running. Dunno how true that is, but that is what the aftermarket jet kit makers recommend so I went with it as per their directions.
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February 8th, 2011, 10:51 PM | #70 | |
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I have never really done this. Could it be possible that fixing that might solve my phantom surge?
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February 8th, 2011, 10:53 PM | #71 |
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February 9th, 2011, 12:42 AM | #72 |
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I just checked... I might have missed it, but I didn't see it. I have known it is done, but since I have never been fully satisfied with my tunning, haven't locked the needle down. Think I might just spring for a dyno run....
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February 9th, 2011, 01:18 AM | #73 |
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Bob, I just looked at the installation instructions on FP website and can't find any reference of installing washers above the clip. I did find the washer comment in the Dynojet instructions, so that's where I must have picked up the tip.
http://www.dynojet.com/pdf/2193.pdf BTW, FP needs to work on their website... it sucks. Interesting tidbit from FP website... says that they no longer sell jet kits to people in California due to emissions. http://www.factorypro.com/Prod_Pages/indexmake.html |
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February 9th, 2011, 02:00 AM | #74 | |
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The whole CA issue is merely a "wink, wink" thing. They are after all located in CA, and are busy supplying jet kits for all our TRACK and OFF ROAD bikes (ask me how I know).
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September 14th, 2011, 02:16 PM | #75 |
ninjette.org member
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anyone worked with Little Red Ninjette before? found the same plate for a few bucks cheaper.
http://shop.littleredninjette.com/Sl...SSBlockOff.htm does this hurt engine life or anything? |
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September 14th, 2011, 02:57 PM | #76 | |
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Never heard of LittleRedNinjette though, looks like a nice small shop. I'd check the total + shipping cost though. Might save w/ the bigger company on total cost.
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September 14th, 2011, 04:10 PM | #77 |
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Looks like a good collection of stuff. One thing that makes me uneasy, however, is that there seems to be no way to contact them, and no indication as to their location.
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September 14th, 2011, 04:23 PM | #78 |
ninjette.org member
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September 14th, 2011, 04:35 PM | #79 |
ninjette.org certified postwhore
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This is the sole reason I won't give them my business; might as well go with Shinto in that case... (refering to a giant bucket of worms).
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September 14th, 2011, 04:47 PM | #80 |
cuz
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can you still dyno w/out it? like get a perfect reading.
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