Was getting 20mpg... will update you on this next tank

[Chad in Michigan]

i'd really like to know what jets/jet kit was used. even with my setup using 115 mains and 45 pilots, 43 tooth rear and 15 tooth front, i don't think my mileage was that bad doing 80+ on the freeway, ever. I think the lowest i've seen is 28 or so, and that is with racing at lights, high speed driving on the freeways. hope you get it fixed.

[DavidJRoberts]

i'd really like to know what jets/jet kit was used. even with my setup using 115 mains and 45 pilots, 43 tooth rear and 15 tooth front, i don't think my mileage was that bad doing 80+ on the freeway, ever. I think the lowest i've seen is 28 or so, and that is with racing at lights, high speed driving on the freeways. hope you get it fixed.

Thanks. Just waiting on my mechanics response so we can find this info out. The jet kit was a cobra stage 1 (made by dynojet) but I don't know what size jets he used until he emails back.

I also gave him some of the info that's been posted here. The links to the pages with other magna owners settins and so on.

Will keep you updated.

[roboto65]

Hoot lets just say that the shims are about half the distance to the next clip so yes provides a little adjustment. And yes they are set for there needles the Cobra jets are tapered alot more than stock for sure...

[TLRam1]

If you hear nothing by tomorrow you can give Cobra a call to see what was in the kit, this is assuming what was in the kit was put in, really be good to hear from the mechanic if he checked what sizes and settings were installed. If your guy reads some of the info on this site he might be able to figure out what to do.

[DavidJRoberts]

If you hear nothing by tomorrow you can give Cobra a call to see what was in the kit, this is assuming what was in the kit was put in, really be good to hear from the mechanic if he checked what sizes and settings were installed. If your guy reads some of the info on this site he might be able to figure out what to do.

Haven't heard back yet, it can take a couple days sometimes. I just looked up the sheet that came inside the kit (as a pdf from their site). It comes with 100, 104 and 108 main jets. Instructions say "If you are running an aftermarket exhaust or slip-on with a high flowing baffle, use the DJ108 main jets." So I presume he used the 108's.

It also says "Place E-clip in groove #3 from the top". So perhaps it was placed on another groove or it needs to be.

I can learn quickly but I don't want to pretend I know what I'm talking about! It seems like my worries are this area so hopefully I can get this right.

If you want to see the sheet that comes with the kit for your own reading pleasure, I got it from here: http://www.dynojet.com/jetkits/motorcycle/honda.aspx#700-900 (the cobra kit is made by dynojet - it's the exact same kit with private labeling).

[Charles S Otwell]

Just out of curiousity what gear ratio (front and rear sprocket size)or you running. You may actually have a couple of areas working against you, not just carbs.

[DavidJRoberts]

Just out of curiousity what gear ratio (front and rear sprocket size)or you running. You may actually have a couple of areas working against you, not just carbs.

Hum, I imagine the stock gears are in there. The previous owner just went to work and back on it which he said was only 5 miles and it was one of a few bikes that he had. He didn't seem like the tinkering type as he had the local dealership just take care of it. All the accessories were added by the first owner so maybe he changed them but check my speed/rpms below:

If I'm going 70 I'm around 5k rpm, at 80 I'm maybe just under 6k rpm. This is off memory so I could be off a little.

I do have soft saddlebags on there (saddlemen large teardrop) but I don't carry nearly anything and a slipstreamer stealth windscreen which I figured would streamline me just a tad at least (it's not very tall - just enough to limit body buffeting).

[hootmon]

Stock will get you a little over 60 at 4 grand.. with one tooth down in front or 3 more in the back will get you about 55 at 4 grand.
The number of teeth is stamped on the sprockets, but sometimes on the back side.. 16/40 is stock..

[TLRam1]

5K at 70 MPH is correct.

Forgot what I was going to write....

[TLRam1]

108's would not cause this by themselves w/o the needle being rich. Greg had this kit and may be he can shed some light what position his needle was in........in fact I believe there is a thread regarding such. 

[Lurkin]

From past posts on the Dynojet kit on the Magna (here and elsewhere), not many have successfully used and tuned this kit properly.  As mentioned, Greg has, but he's always the "outlier" 

That being said, and if I recall correctly, the DJ jets are a different type and jet sizes don't correspond to the stockers, so they can't be compared.  Between that and the needle taper difference, there is little in common with tuning the DJ kit vs. the stock shim/jetting.  Also, if I recall correctly (notice the trend here, validate everything I say...), the standard DJ kit install instructions are incorrect in where the clip should be placed, causing it to run rich if installed like they say.  I believe that the clip is supposed to be in the second slot.

Also note that the DJ kit requires drilling of the slides and cannot easily be reversed if the kit cannot be tuned correctly.  I.e., new carbs or at least a donor set to take the stock slides back from.

I'm not necessarily helpful, but hopefully you can get some info from it.

Rod...

[Jerry G Turner]

When I rejetted my Shadow I used a dyno jet stage 1 kit followed the instructions when completed it ran great got lousy gas mileage about 20 mpg I took it back apart went to the next lower jet size and moved the clip down it increased the mpgs by more than 10 mpg.

[DavidJRoberts]

When I rejetted my Shadow I used a dyno jet stage 1 kit followed the instructions when completed it ran great got lousy gas mileage about 20 mpg I took it back apart went to the next lower jet size and moved the clip down it increased the mpgs by more than 10 mpg.

That's what I'm looking for! Cool, I'll pass this one along to my mechanic.

Cheers everyone, I'll give my mechanic a call today and see if I can get him to go back in there and do these things. This has been very helpful.

[Jim8208]

I've got this same setup on my bike and my mileage is decent. I don't keep up with the exact mpg. I hit reserve (depending on how the throttle is utilized) around 100 miles, give or take. Averaging 75-80 mph on the freeway I've hit reserve as low as 86 miles. Even on the interstate I'm still getting roughly 31 mpg. I can live with that at that speed. You should be getting much better mileage with the dynojet kit than you are. I'd be interested also in hearing what your mech has to say about it. Good luck.

[hootmon]

I asked this question before and I don't know if it matters at all, but is this a California Emission modified bike, and will that make ANY difference in any of the settings???