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Message started by cheapnewb24 on 12/24/15 at 19:33:06

Title: Did the white spacer mod...Wow
Post by cheapnewb24 on 12/24/15 at 19:33:06

I did the white spacer mod today. It turned out to be a Christmas gift to myself. I considered using 4 washers since 4 of them were smaller than the spacer, but I settled for three. Perhaps it was best I did. Maybe it's all in my head, but I get the feeling that it just runs better! It idled a little weird for a while, but when warm, I adjusted the idle mix, and I think it ran the best it ever has. SMOOTH. Don't get me wrong, on a good trip, the thing would get nice and smooth even running lean, but now it acts like a fuel injected car :o. SMOOTH--RESPONSIVE She's got some balls now! Seriously, goose her hard off the line, and she'll go sideways with ya' now :o. Maybe it's just differences in road conditions/driver input? Smooth, damp asphalt? Maybe its just all in my head?

Has anyone else noticed this kind of effect from just doing the spacer mod?

I noticed that using the enrichment knob when warm before the mod speeded up shortly before bogging on idle. The same is true or more true now. However, I did experiment and find that, though it ran rich at idle with the knob pulled, I got an increase in power with some throttle. I believe this means that the idle mixture is approximately correct, but the needle jet is still a little lean? Or, perhaps, since maximum power is produced by running a little rich, that... Hmmm...

Any ideas?

The thing still backfires, by the way.  :P Maybe a little less, especially when the engine is not fully warm. But it seems like when it does make noise, it is often moderately loud backfiring rather than gentle noises. :-?

I ride between at least 1000-2000 feet elevation, typically. My house is around 1500. I live in hillbilly coal miner country, so I am liable to experience pretty wide elevation swings. In fact, I can't step foot onto asphalt without an elevation change :P. For cryin' out loud, hiking across our own property is an elevation change! ;D Got plenty of acreage, if we could do much with it :P. Skin the turf, and watch your dirt wash away with the next rain :(. It's the curse of the mountains, I guess.

Title: Re: Did the white spacer mod...Wow
Post by cheapnewb24 on 12/24/15 at 19:37:19

The cool thing is that I got 3 packages of parts/accessories for my bike today in the mail as I came back from my test drive. Merry Christmas to myself :D. It was kinda tricky holding that stuff in my lap as I rode up that wet dirt road. The crazy thing is that I ride through the potholes full of dirty water in order to avoid the mud ::). Sliding in the mud seems worse that the puddles. :D

Title: Re: Did the white spacer mod...Wow
Post by Art Webb on 12/24/15 at 20:22:11

good you seem to have gotten the good out of the white spacer mod, I'll leave answering the questions to those who know the bike better than I

Title: Re: Did the white spacer mod...Wow
Post by cheapnewb24 on 12/25/15 at 05:46:19

Also, I had suspected that the white spacer mod would help reveal an insufficient main jet (I believe it's 145). Maybe a little. When I hold full throttle for a second or two and let off, the engine sounds more strained under full throttle, but, by seat of the pants, the extra throttle doesn't increase acceleration much compared to a little less. You might say it's getting enough fuel not to show obvious problems, but I am thinking that increasing to 147.5 will make it sound/feel better and give a bit more acceleration at full throttle. Rejetting might get it closer to stoichiometric, but if there's any time the engine could afford to run slightly rich, full throttle is it.

I noticed that the engine seems to cruise at slightly lower rpms before lugging or feeling strained. Has this been the case with anyone else? Some seem to suggest it in other posts, though I'm not sure how clearly the idea has actually been stated.

Does anyone have thoughts on any of these matters? :-?

Title: Re: Did the white spacer mod...Wow
Post by Art Webb on 12/25/15 at 09:07:38

If, at WOT, you back throttle a tiny bit and the bike goes FASTER you have too small a main jet
you will feel this as a throttle drop surge, where the first few degrees of 'backing off' actually gives a tad more power
factory jetted Rebels are notorious for this

Title: Re: Did the white spacer mod...Wow
Post by Kris01 on 12/25/15 at 12:28:50


252E232736282331247472460 wrote:
I noticed that the engine seems to cruise at slightly lower rpms before lugging or feeling strained.


Absolutely. When jetted properly the engine runs properly. Amazing!  :D

Title: Re: Did the white spacer mod...Wow
Post by Kris01 on 12/25/15 at 12:30:07


23303635272020420 wrote:
factory jetted Rebels are notorious for this


And Savage/S40s!

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