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Message started by orrin7 on 01/09/06 at 17:49:53

Title: jetting
Post by orrin7 on 01/09/06 at 17:49:53

just put a 152.5 in my 2005 s40. my question is the jet is a smaller outside dia. than the stock but seems to seal up on the brass washer behind it and bike seems to run fine. i was wondering if anyone else has run into that situation.

put a sporty muffler , 152.5 jet (came with 145) idle mixture out two turns . and this made my bike totally different . more power , better response , no backfiring. cool sound , i love it.

Title: Re: jetting
Post by Reelthing on 01/09/06 at 17:55:26

The small ones will work ok - the large rounds seem to fit a bit better - just don't forget the washer! (did that once)

does wake um up a bit for sure

Title: Re: jetting
Post by cigaro on 01/09/06 at 19:11:29

So, if I buy the carb jet for my 04, should I get the 152 or the 155, or is it going to matter that much? And will the thin brass washers work as well as the shaved white spacer? And do any of the other jets need replacing at the same time, too? I've got the HD sportster muffler already, but haven't put it on yet...what I'm looking for is sort of the definitive specs to order or track down, to get the parts together and have ready when the time is right....

Title: Re: jetting
Post by pgolden on 01/09/06 at 19:25:16

The 152.5 main worked perfectly for my bike. The washers they are talking about are under the jet. The white spacer is under the long needle when you remove the diaphram slide. You can make the white spacer thinner by placing it on a strip of emory cloth, taking your index finger and work the spacer back and forth. I trimmed mine to 1/2 it's original thickness. I didn't change any jet other than the main jet.

Title: Re: jetting
Post by Reelthing on 01/09/06 at 19:34:55

Most likely the 152.5 or maybe 150 depending on where you live - altitude and such - you can cut the white spacer down by about half or use a couple of washers instead of the white spacer that amount to 1/2 it's thickness - but you may need spin the washers down a little to get a good fit - might as well just sand down the spacer. You do not need to change the pilot jet unless your out over 2 turns close to 3 turns on the mixture screw. Normally these bikes are happy at 1 3/4 - 2 turns out

Be sure and read over the carb spec doc in the tech section - while you have carb open it's a good idea to replace the soft stock machine screws on the bowl and the diaphram cover with stainless allen head - be really careful with the screws in the bottom of the slide - they're small but use a good/new phillps #1 on them with heavy presure or they'll likely strip out

Title: Re: jetting
Post by Steve530 on 01/09/06 at 20:17:20

Has anyone tried using a Phillips socket on ratchet handle to get these screws out? You can get a lot of doen force and a lot ot torque on the screws with those.

Steve

Title: Re: jetting
Post by Jim_R on 01/09/06 at 20:36:48

All I can say is be careful. They are made of monkey tin metal and strip out super easy. I would get replacement screws but I hate allen wrenches. I remember the 1st time I did it and I saw my screw start to strip and thought of how bad it would be if it did fully.

Good luck.

Ohh and if u are messing with the jets try replacing the air filter with a k&n replacement or a pod filter.

Title: Re: jetting
Post by BS37066 on 01/09/06 at 20:36:52

I haven't tried a phillips on a socket, although I have one.

I have stripped one of the carb screws using an impact driver. That shouldn't have happened. The screws are butter soft and they must be over-torquing them at the factory.

Impact driver definitely are better than ratchet handles, for this particular application.

Luckily, the screws aren't flush. You can still wrap a pair of pliers around them. :o

Title: Re: jetting
Post by vroom1776 on 01/10/06 at 07:34:45

Buy both jets as they are cheap and do a plug chop.

Title: Re: jetting
Post by Steve530 on 01/10/06 at 16:15:22

I've had an impact driver for years, but never found it useful. Maybe mine never worked right.

Steve

Title: Re: jetting
Post by lancer on 01/11/06 at 00:05:41

Steve530 wrote:

I've had an impact driver for years, but never found it useful. Maybe mine never worked right.

Steve

I use mine frequently, especially on the flange mounting screw/bolts...until I changed them recently to hex-head bolts. That sure makes for an easier change!

Title: Re: jetting
Post by Savage_Rob on 01/11/06 at 07:34:19

lancer wrote:

I use mine frequently, especially on the flange mounting screw/bolts...until I changed them recently to hex-head bolts. That sure makes for an easier change!

Yeah, I put allens in when I mounted the Amal.

Title: Re: jetting
Post by dubb-1b on 01/12/06 at 09:56:33

another option to the white spacer. go to ace hardware and they hjave a white "spacer" in the washer section that is exactley half the thickness and costs 10 cents or so. and you can keep the original for whatever reason.

Title: Re: jetting
Post by Savage_Rob on 01/12/06 at 10:47:17

dubb-1b wrote:

Just make sure gasoline won't dissolve it.