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General Category >> Rubber Side Down! >> Need Help With Mods, Rejet, Spacer, Mixture Screw
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Message started by Jesse Cremeans on 02/15/06 at 17:26:36

Title: Need Help With Mods, Rejet, Spacer, Mixture Screw
Post by Jesse Cremeans on 02/15/06 at 17:26:36

Ok. Here is how i stand now. I have just purchased a HD sportster muffler, and am going to purchase a pod k&n rc-1250 like the one Greg has on his green savage.

Now i need to do the work to the carb. but my knowledge of carbs is very limited. I am positive i can handle the white spacer mod, but the mixture screw and the rejetting parts are still a bit fuzzy. im thinking i want to rejet to 155, but have no clue where to start? i beleive i purchase a new jet? im just going off what i could read in posts and such so if anyone can point me in the right direction for the mixture screw mod, and the rejetting part that would help a lot, in the mean time im going to install the airfilter, muffler and do the white spacer mod.

Thanks
Jesse

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Dynobob on 02/15/06 at 18:45:41

The white spacer is the hardest part of a complete rejet. To reinstall those tiny little screws that hold the white spacer in, tape the screws to your phillips screwdriver with a bit of electrical tape. This will save you a ton of headaches.

To do the mixture screw you just drill through the cap over the screw, thread a sheetmetal screw into the hole, and pull the plug. Be very careful while drilling. Use light pressure and stop frequently. It is very easy to drill through the plug and hit the mixture screw.

The main jet is super easy. Pull off the float bowl (the bottom of the carb), unscrew the old jet, and screw in the new. Be careful not to disturb or bend the float. Go to your local dealer and order a large, round Mikuni jet from Parts Unlimited or try to get one from a Harley dealer.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Reelthing on 02/15/06 at 20:12:56

hang on there - if you have a '87 it came with a 155

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 05:47:14

Reelthing wrote:

hang on there - if you have a '87 it came with a 155

And (some of) the European carbs use smaller jets.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 06:30:54

hmm alright so what next.. if i have an 87 with a 155..? im going to do the white spacer mod today hopefully.. bit chilly out but im going to pul the carb out if i can get around to it... how about the pilot jet?

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 06:43:31

Jesse Cremeans wrote:

You shouldn't change the pilot jet unless you have to back out the idle mixture screw more than three turns (from all the way in). Pull your main jet and see what it is so you know for sure. It'll be stamped into it.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 06:53:34

alright thanks guys, ill let you know what my pilot jet is and ill do the white spacer mod.. im still a little confused on the mixture screw mod though..

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Reelthing on 02/16/06 at 07:08:26

in addition you may not need the spacer mod if your needle has the 3 groves - then you can just move the cring clip/keeper

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 07:10:32

hmm when i get it apart ill take pictures so you guys can see what i have and need to do?

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Reelthing on 02/16/06 at 07:19:44

In a nutshell the adjustments are going to be the easy part - getting that '87 carb apart without strip'n the screws is going to be the hard part - and by all means replace the screws with stainless allen heads if you can them at the hardware store

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 07:24:51

Reelthing wrote:

Yup. I got them at Ace Hardware. Please read the Carb Specs. thread in the Tech section ahead of time so you'll know what to expect. There are really a lot of previous threads that go in depth on this but they'll require using the search tool. There are two or three good reference posts in the Tech section though.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 08:11:15

ive taken the carb apart twice before and buying new alen head screws sounds like a great idea right about now.. ive gotten the air box out so i can put the k&n in, and i took my header off so i can paint it flat black since its chrome days ended long ago.. one question i have is.. what are the two black hoses connecting directly to the BOTTOM of the airbox, i know the one on the top front is the crankcase breather hose i beileve? but those two on the bottom i am not sure what they are.. also on the exhaust side of the bike coming right along next to the brake cable there is a cable that then turns and runs up behind the airbox. part of this cable is twisted, well the black plastic goes in a spiral fasshion and there is a tiny metal spring connecting one part of the cable to the other. well the spring has long since rusted out and is not connected anymore.. ive also discovered the bike is stuck on PRI. so when i ran the bike last fall that cable was broken and the bike was on PRI the whole time.. what effect would these have on its performance?

thanks guys, ill check the search option and browse the tech, for some info

Can't thank you guys enough,
jesse

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Reelthing on 02/16/06 at 08:53:21

The hoses out the bottom of the air box are just oil drain lines - that breather line causes oil to collect in the airbox - the spring on the exhaust side connects to the stop light switch for the rear brake

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 08:57:39

The hose on the bottom of the airbox is a drain in the event that oil backs up through the breather hose. You should remove the plug and drain it every now and then to keep from having any buildup in the airbox.

I believe the other hose is your battery vent and doesn't actually come from the airbox.

The cable you mentioned I don't have a real mental picture of and I'd have to look at the bike later to figure it out, I guess. It may go to the brake light.

Being stuck on PRI is alway allowing fuel to flow to the carb and will flood it when it's not running. That's something you'll need to address. If you can't get it unstuck, you'll probably need to replace the petc0ck. Either that or put an inline on-off valve between it and your carb. If you do that, you have to remember to shut it off every time you shut down the engine. I'd recommend replacing the petc0ck if you aren't able to fix it so that you'll be able to take advantage of the reserve capacity.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 09:37:53

yea im going to replace the petc0ck i have a new one coming in the mail soon.. everything is apart now, fenders off tank off battery and battery housing out, airbox out, side rails off etc. just a frame, engine, tires, belt, wires and all the electrical stuff up front is still on. i think you guys are right about the break light part. Im going to see if the hardware store has a small spring like that.. if not maybe ill butcher an old vcr.. they usually have some springs that size.

how easy is it to get new fuel lines? both coming from the petc)ck need to be replaced.. they are cracked and leak at the connections.

Now its time to crack open the carb and see what i can do in there. ..

Oh yea, you were right about the oil drain, when i removed the airbox, sure enough oil drained out of those lines and a bit out of the bottom of the airbox. Also the carb was flooded, and i found this out after removing it i flipped it over to look at it and got a nice flood of gas down my leg haha..

thanks again guys

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 10:19:46

Well, you only have one. The other is the vacuum line. However, I think they're both actually the same stuff. Anyway, just take the old ones to a dealer or an auto parts store and ask for some fuel line. Show 'em the originals to get the right size. Get about 18" of it so you have some spare and, while you're there, get an inline fuel filter to go with it. They're cheap extra protection and the clear ones let you see if you have fuel flow.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 10:37:09

good idea on the fuel filter,

so now i need.. allen head screws for the carb, inline fuel filter and fuel line, and some elbow grease to get the bike pretty again. haha

thanks again
jesse

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by bentwheel on 02/16/06 at 11:32:45

I want to reiterate what Reelthing said. The 1986 to 1988 are different from the rest of the Savage lineup and are jetted correctly from the factory. They do not require further meddling to cure a too lean mixture. Never shave the white spacer on these early models. Leave the white spacer intact and adjust the low speed to mid range mixture by moving the clip on the jet needle into one of three grooves. Only the early year Savage's have this feature. The middle position is standard from the factory and is actually right on. I moved the clip lower to rich-en my mixture and found the engine ran too rich. I also lost 30kms per tankful, so I put it back into the second groove. My biggest complaint is the gas tank is too small, so I was quite annoyed by the lost kms. Another difference regarding the early years is, I believe, the exhaust is more free flowing. I am not 100% sure on this but at the very least, just by the nature of these old ones being 20 years old the muffler becomes less restrictive. If you are going to change to a HD muffler I would not necessarily rejet. Just run it with the new muffler and do a plug check to test for rich/lean correctness. If it looks lean, make an adjustment with the jet needle by moving the clip down. That may be all you need to do. If not, well then you can experiment with different main jets. People forget that the very early Savages were properly set up when new. I call them the hot rod Savage.

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Jesse Cremeans on 02/16/06 at 13:15:29

you guys just saved me alot of tinkering with my carb. I was not aware that the early savages were set up correct. makes my life a lot easier. Im still going to go ahead with the Hd sportster and the kn pod filter and ill see how she runs with everything set up..

thanks agian,
jesse

Title: Re: Need Help With Mods, Rejet, Spacer, Mixture Sc
Post by Savage_Rob on 02/16/06 at 13:36:19

That's true, assuming the carb is the normal one found on an '87. If it were me, I'd look at the needle and the main jet. If the needle has 3 notches and the main jet is a 155, I'd leave well enough alone and just adjust the idle mixture. If they're not, then it's time to decide what to do next. If the bike is an '87 and the anti-tamper plug is still in place over the idle-mixture screw, it's probably the stock '87 carb. I'd just want to verify personally before possibly leaning it further with airflow changes.