High elevation jetting on a Mod 450R

[benroels]

Bought an 06 450ER from a guy on here from MN. So far, not super impressed with the "wrenching skills" since just about every bolt I have taken off has been loose or just finger tight. It's ok, I'll just go through it. So...

Question is, it is suppose to be a "470" with a new crank. I am familiar with 04/05's, but not the 06 on. Minnesota is close to sea level elevation (0-1000ft) and I live at 7300 feet and ride @(6-9000ft). I called "Sun" from Denver and they said to run a 112. So I bought one. Pulled the main and it was a 185. Does not seem right to me.

Any suggestions where to start with the main?

Oh, and I pulled the 185 jet and the whole long thing came out, tried to put it back in and its stripped.

BTW- it ran just Ok in MN when my buddy rode it/test rode it. Not perfect. It "bogged/coughed" at 3/4 throttle in every gear. When I got it, I noticed both the boots on each side were not installed correctly, not even close.

Thanks,
Ben

PS-Supertrapp exhaust and I think Stage 2 cam. So many damn variables!

[DnB_racing]

when you say the whole long thing came out are you saying that there are two pieces to the jet? if so its a dynojet and you want to get rid of that style anyway, use keihn jets!

a 112 even at that elevation is too lean, his 185 was too rich(bogging and coughing @3/4 throttle) the size he should have had is about 168 (+/- 5). Depending on your pilot jet and clip setting you might want to start at around 160-165 on your main, no less than 42 pilot, clip 3rd down on needle

[Baileygunns]

You can't just "get rid" the dyno jet... If the air bleed is plugged the jet size you just gave him isn't going to work...

You can still use stock jets is the air bleed is plugged but you would run a smaller jet than normal. The plug that comes with DJ kits richen up the mixture...

No mater what you have in ther the 185 is to rich. I agree with that.

[DnB_racing]

Originally posted by Baileygunns
You can't just "get rid" the dyno jet... If the air bleed is plugged the jet size you just gave him isn't going to work...

You can still use stock jets is the air bleed is plugged but you would run a smaller jet than normal. The plug that comes with DJ kits richen up the mixture...

No mater what you have in ther the 185 is to rich. I agree with that.

?? air bleed? are you talking about leek jet? I dont think all the dyno has the leak plug do they? why not get ride of the two part dyno jet if its stripped anyway? he should replace the needle with NCVQ but the dyno needle will work with keihn not the best but it does work.

on a fresh carb with no ac/p mods the sizes I gave are a good place to start! were do you think he should start?

[Baileygunns]

Air bleed and leak jet are 2 different things... The DJ kit comes with a little brass plug that blocks an air passage... If you look into the carb from the air box side, on the left side of the horn there is a little hole. The plug blocks that.

The DJ needle is fine and I have heard of good results using it. (never used coupled with stock jets myself) and you can put stock jets back in even if you have the air bleed plugged but you would have to convert the DJ jets sizes into Kiehin sizes to figure out where to be... And you wont need as large of a kiehin jet as you would with out the plug.

For an unmolested carb you gave good info... But that's not what it sounds like he has.

If I can find a pic of the plug I'll post it...

[Baileygunns]

Here is a conversion chart for the jets....

Width------Keihin # -- DynoJets # -- Mikuni #

0,0540---- 140--------- 130--------- 121,9
0,0550---- 142,5------- 132--------- 123,8
0,0560---- 145--------- 134--------- 125,6
0,0570---- 147,5------- 136--------- 127,5
0,0580---- 150--------- 138--------- 129,4
0,0590---- 152,5------- 140--------- 131,3
0,0600---- 155--------- 142--------- 133,1
0,0610---- 157,5------- 144--------- 135,0
0,0620---- 160--------- 146--------- 136,9
0,0630---- 162,5------- 148--------- 138,8
0,0640---- 165--------- 150--------- 140,6
0,0650---- 167,5------- 152--------- 142,5
0,0660---- 170--------- 154--------- 144,4
0,0670---- 172,5------- 156--------- 146,3
0,0680---- 175--------- 158--------- 148,1
0,0690---- 177,5------- 160--------- 150,0
0,0700---- 180--------- 162--------- 151,9
0,0710---- 182,5------- 164--------- 153,8
0,0720---- 185--------- 166--------- 155,6
0,0730---- 187,5------- 168--------- 157,5
0,0740---- 190--------- 170--------- 159,4
0,0750---- 192,5------- 172--------- 161,3
0,0760---- 195--------- 174--------- 163,1
0,0770---- 197,5------- 176--------- 165,0
0,0780---- 200--------- 178--------- 166,9
0,0790---- 202,5------- 180--------- 168,8
0,0800---- 205--------- 182--------- 170,6
0,0810---- 207,5------- 184--------- 172,5
0,0820---- 210--------- 186--------- 174,4
0,0830---- 212,5------- 188--------- 176,3
0,0840---- 215--------- 190--------- 178,1
0,0850---- 217,5------- 192--------- 180,0
0,0860---- 220--------- 194--------- 181,9

[Scro]

I've never understood the concept of plugging the air bleed. What advantages does it give?

[Baileygunns]

I know this isn't a picture of a FCR carb but it's the same thing... That green arrow is pointing to a plug that is blocking an air passage... By doing that you richen up the fuel mixture. DJ runs smaller jets with that plug in. They also use a different number system and you can see from that chart...

http://img87.imageshack.us/img87/1920/98989203.png

There really isn't a need to run that plug unless you are unable to get large enough jets in you carb... MAJOR motor work would call for that... No idea why DJ does it... I do know it makes for a pain in the *** to dial in you jetting on the 450R.

[DnB_racing]

is this something that is 04-05 carb related or is it also +06 fcr the things ive seen have been 04/05

[Baileygunns]

Like I said... I know the pic isnt a FCR carb (whats on the 06+) but it is the brass plug is the same thing in the FCR as the old carb.

[DnB_racing]

im not sure if the +06 DJ kits have the plug When I first got my 06 I put the DJ kit and there wasn't any plugs with my kit. His might not have it, If it does it should be easy for him to see and adjust accordingly or remove and go HRC

[Baileygunns]

For sure... Just something to be aware of..

[benroels]

The top of the carb says CR. On the side where the choke is, it has two pull knobs, one black and one red right above it. Ive only had 04 and 05ss, so this is a little new to me.

So, get rid of the dynojet, if thats what it is and just put the main jet in right....

Any suggestions as to what size...160 to start...

[DnB_racing]

two knobs sound like an edlbroke?or another aftermarket carb. are you sure that the quads an 06?

[DnB_racing]

does it look like this if so its not stock and could be a few different carbs check for all marking


make sure your TPS wires are hooked up I think they have different connectors. I think it might be ESR

[benroels]

Originally posted by DnB_racing
does it look like this if so its not stock and could be a few different carbs check for all marking


make sure your TPS wires are hooked up I think they have different connectors. I think it might be ESR

It is an 06. Yep, that looks just like it. The carb does say Keihin on the side though

Edited to add.....THANK YOU

[DnB_racing]

ya thats a keihn aftermarket possibly 39mm or 41mm you have to find out what size that will afect jet sizes, you have to measure how big the bore is on the engine side of the carb