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General Category >> Rubber Side Down! >> is a rejet necessary?
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Message started by Chip 2010 on 03/22/18 at 06:45:22

Title: is a rejet necessary?
Post by Chip 2010 on 03/22/18 at 06:45:22

I haven't done any mods to the carb, but I did get rid of the airbox and snorkel so I could move/hide the battery. I replaced the original filter with the RYCA cone filter and silicone elbow. There's a bit less surface area on the RYCA filter but air passes through it easily. I've started and run the bike a few times with no noticeable change other than the backfire on shut off has softened to about half the noise level that it was originally. So IS the rejetting really needed? Carb work is something that I've rarely attempted and I'm a little apprehensive about it.

Title: Re: is a rejet necessary?
Post by Dave on 03/22/18 at 07:27:23

You are the only one that can answer that question....not all bikes run the same and require the same jetting - and the elevation where you ride has as much effect on the jetting as changes to the intake/exhaust do.

If the bike idles well, accelerates smoothly at moderate throttle settings and doesn't have any surging - you might be just fine.

(It wouldn't hurt for you to let us know what elevation you live and ride at.)

Title: Re: is a rejet necessary?
Post by Chip 2010 on 03/22/18 at 08:12:03

presently I'm at about 1000 feet. I'll be headed out for another slightly longer test ride in a little while.

Title: Re: is a rejet necessary?
Post by Chip 2010 on 03/22/18 at 08:28:28

this is what she looks like at present. Well, almost. I tried a cone filter from Dennis Kirk that was supposed to fit but didn't. This was just before I switched to the Ryca filter and elbow.

Title: Re: is a rejet necessary?
Post by Gary_in_NJ on 03/22/18 at 09:21:53

We jet for throttle response. If you have smooth, linear response throughout the entire throttle usage (rolling on the throttle from idle to wide open throttle and letting rev out while in 2nd or 3rd gear) then you're good. If the bike falls on its face during this process, or if you have surging at part throttle, then you need to rejet.

Title: Re: is a rejet necessary?
Post by Chip 2010 on 03/22/18 at 10:34:09

The bike has always surged a little when cold. That hasn't changed. I did notice two or three little pops on deceleration (one soft pop two or three separate times), but that would occasionally happen when she was bone stock too. Most of my ride was stoplight to stoplight first through third. I did take her out and open her up through 5th and up to 60 on the speedo. Felt good, and sounded much better than normal. Not sure why the stock muffler sounded more rumbly and less squeaky, but it had a noticeable bigger bike sound.

Title: Re: is a rejet necessary?
Post by Dave on 03/23/18 at 04:02:40

06787B7B7D4B0 wrote:

The bike has always surged a little when cold.

That is normal for a bike with a carb......there is always a short time when the choke makes the mixture too rich - and it is a bit lean with the choke turned off.

Deceleration pops are also normal.....when you close the throttle the mixture goes lean....and you can get pops/burbles/blats. Don't close the throttle completely and you can make the noise go away.