Re-jet issues - Page 4

**J-Adix** · 08-15-2010, 06:10 PM

Here's another update. Yesterday I put in a #48/#148 combo and I am now a little on the rich side, which I don't mind. I'd rather be rich than lean. The bike runs great and running rich makes it sound throaty and bad-ass. I'm glad I'm on the rich side of things because now I know that a #45 slow jet is definitely the one. I'm still waiting for a #150 main jet; the place that Mountian Motorsports orders thier parts from keeps sending them the wrong ones, which is slowing down the whole process. Once I get the 150 main jet I'll try doing a #45/#150 combo and that should nail it. The #45/#148 was nearly perfect and made the bike run great, but IMO it was a little on the lean side, or (good to lean), and I'd prefer to be (good to rich). I'll be in San Fransisco for the last week of this month so I'm hoping I can get the part before I leave.

**cagie** · 08-15-2010, 08:44 PM

so, refresh my memory; you said shorty exhaust... are these open through on stock head pipes, new head pipes, baffled, open baffled?? need to know for comparisons.

**J-Adix** · 08-16-2010, 06:37 PM

Yeah I have the 12'' EMGO Shortys on there, which I put on the stock head pipes. I think you could describe them as being open baffled. They are definitely designed to allow for maximum air flow, but they do have some recessed baffles along the inner walls. However nothing that would restrict, or reduce air flow. I probably have very little back pressure due to these muffler's diameter and length, but they are small which keeps with the Bobber look, and they sound pretty nice too. For me it was a toss up between using the EMGO 12" shortys, or the Cocktail Shakers. I really like the look and sound of the shakers, but ultimately I decided to go with the shortys due to the Bobber philosophy of less is more.

**goody** · 09-12-2010, 05:49 PM

any ideas on needing this for a 450, i wanted louder pipes, and not knowing anything about a carb besides it doin the fuel thing. would i need new jets if so where do i start to look?

**goody** · 09-12-2010, 05:53 PM

and BTW i have some weird puff puff sounds duuring your time of ideal and decelration times you mentiond, could this be jetting issues, it sounds like its coming from the carb.?? any help please. it mkaes me nervous

**e.419** · 09-13-2010, 03:16 PM

Quote:

Originally Posted by J-Adix

Yeah I have the 12'' EMGO Shortys on there, which I put on the stock head pipes. I think you could describe them as being open baffled. They are definitely designed to allow for maximum air flow, but they do have some recessed baffles along the inner walls. However nothing that would restrict, or reduce air flow. I probably have very little back pressure due to these muffler's diameter and length, but they are small which keeps with the Bobber look, and they sound pretty nice too. .

I have the 12" Shorty's on as well, rode with them on for a while then decided to take the recessed baffles out just to see... you wouldn't think it but those baffles do stifle the air a bit... not a huge amount but you can definatly tell the difrence in sound between them out and in.

**jfollmer** · 09-19-2010, 11:26 PM

I just cleaned my carb on my stock 85 rebel 250 and the bike is running lean. It used to be running Really rich(50mpg was good) and the plugs were always black and smelled of fuel and it used to have a top speed of gps 80+ and i was barely getting 60mph (stock pilot screw honda setting) and now I have it gps'd at 77.3mph after some tuning. I also have the pilot screw out over 4 turns where Honda says the stock position is 2.75.
I was thinking I would experiment with some new jets and noticed you guys were talking about main jets from 130 to 150. Isn't the stock jet a 110 from what I read, so that would be multiple steps above what I have instead of a few as posted above? I have no mods on the bike and I am actually gonna get it dynoed on Oct 1. I was wondering if I should keep turning the pilot screw out if its still lean or consider re-jetting? Maybe a #40/#120 or so instead or should I go with something higher? I am considering changing the air filter to a pod and if i can find inexpensive pipes then I will add them too. Thanks, I am new to the art of carbs so I am trying to learn and not destroy hahaha

**flitecontrol** · 09-20-2010, 12:07 AM

Usually, rejetting is only needed when going to a non stock air filter. Not sure why it's running so lean. Maybe the better wrenches will chime in soon.

**jfollmer** · 09-20-2010, 12:49 AM

also is the slow jet an N424-21 or N424-22? This re-jetting was an after thought so I could not remember the position of the threads when I pulled the jet out to clean it. Thanks again.

**bB2NER** · 09-20-2010, 09:45 AM

I wouldn't mess with the jetting till after you know the carb if fully clean. Sounds to me like something is still plugged. Having the idle screw out so far is partially masking the problem.

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