Author Topic: Danielle CB550K Build - Toyon Moto Club #5 (Read 89869 times)

Jimcg · « **Reply #600 on:** April 02, 2021, 12:38:07 AM »

Quote from: Blackfin5 on March 31, 2021, 01:31:14 PM

Actually quite well. Great turn in. Holds the line. Feels very nimble. The rear shocks are 365mm, but still has a 95mm trail with the Cognito 35mm offset tree. But I haven't pushed it hard yet. If there issues, I think I can shorten the shocks or go back to the 13.35 in. IKons. Then trail will be 101mm. But it looks more raked than it is.

About the 365 shocks, do you have problems with the chain rubbing the upper side of the swingarm with those?

Beautiful bike by the way! 👍

/Jim

Blackfin5 · « **Reply #601 on:** April 02, 2021, 07:14:52 AM »

Hi Jim. Thank you.
It's very close, but it isn't the stock swingarm so I don't know if it would otherwise. It's a box arm by Denis Curtis. I have about 3/4" of chain slack. It's a 520 chain. I will post a pic of where the chain is in relation to the swingarm when on the side stand.

Blackfin5 · « **Reply #602 on:** April 02, 2021, 07:22:32 AM »

You can see it's close on the counter sprocket side and there has been some contact on the ends of the white protective plate. Note - In checking the stock swingarm on my orange 550, the CMR arm has a taller profile, hence slightly less chain clearance.

Blackfin5 · « **Reply #603 on:** April 02, 2021, 10:13:52 PM »

Well... spent late afternoon and this evening de-racking the CR26s. The unpredictable idle, the stumbling on acel and popping on decel has not resolved despite adding a hefty dose of Seafoam to the fuel. I hate tearing apart and cleaning carbs but hate the hesitation, sputtering and lack of throttle response even more. The jets weren't as bad as I thought, but the #3 pilot was fully clogged. After letting all of the jets soak in clear solvent, a lot of residue was in the wash cup..the solvent turned murky, so I guess they need cleaning. Some residue was in the bowls as well...not perfectly clean fuel. After reinstall, it leaked a lot of fuel. Loose line and a couple bowl drain plug screw caps not tightened all the way. Started quite readily and idled evenly at 1100 after warm up just like I remember. Can't wait to go on a tear in the morning to see if all is good again. Cheers.

Godffery · « **Reply #604 on:** April 03, 2021, 07:23:54 AM »

"idled evenly at 1100"
Now That is impressive! I'll be interested to here your final settings after the road test.

Blackfin5 · « **Reply #605 on:** April 03, 2021, 11:11:14 AM »

Jeff , what ever the baseline numbers were that you emailed me way back when for the CR26s, I think I only went up one size for the pilots. I believe the jets are 45/115 or120...but not sure.. it's a pretty robust motor.

Blackfin5 · « **Reply #606 on:** April 03, 2021, 11:51:17 AM »

After the carb cleaning, I had a very disappointing test ride. Although it idles very well, which I attribute to now having clean pilot jets, the stumbling, bogging and hesitation is actually worse. Then it "catches" unexpectedly and takes off like a rocket, but only for a few seconds before bogging down again. It is almost like one or two cylinders suddenly jump to life, then cut out again. Back at the shop, all headers were hot, but the #2 and #3 not as hot as #1 and #4.

I pulled the plugs, and not too bad - nothing that causes me concern. I also checked the Dyna 2000 to make sure I was on the correct advance curve program setting, which is No. 4. So, now I am really stumped and frustrated. I will pull the ignition cover to check the Dyna 2000 timing marks next.

Suggestions?

Cheers.

Godffery · « **Reply #607 on:** April 03, 2021, 01:12:04 PM »

Hmmm, I recall hearing You say it was running good last year? Right?
If so, then I'm guessing all the settings should not need to be changed, and that only leaves something that could have been damaged in the tip-over or other changes that have been done since then?

Blackfin5 · « **Reply #608 on:** April 03, 2021, 01:26:58 PM »

Correct, it was running awesome. Could not have been more pleased.

MRieck · « **Reply #609 on:** April 03, 2021, 01:54:54 PM »

Kevin....were you using ethanol fuel when you stored it?

Blackfin5 · « **Reply #610 on:** April 03, 2021, 05:24:47 PM »

Mike, definitely. It's CA. I was buying racing fuel at 5 gallons at a time, but it became a hassle. And it seems the Dyna 2000 is working properly. It sure seems like a fuel delivery issue, but I cleaned the crap out of the jets yesterday.

Blackfin5 · « **Reply #611 on:** April 03, 2021, 07:02:20 PM »

Side note - after I laid the bike down, I drained the fuel and flushed it out before my body guy pulled out the dent and had it repainted. The fuel in the tank is fresh, but ethanol fuel was in the float bowls while sitting. I would think though that amount of fuel would have evaporated leaving behind an ethanol residue.

I'm going to draw some tank fuel out in a clear jar to see if any particles come out. Maybe the carbs got re-gunked on start up. I'm planning on de-racking the carbs again to try to figure what is going on.

Blackfin5 · « **Reply #612 on:** April 04, 2021, 08:08:03 AM »

The fuel from the tank and bowls is pretty clean.
Happy Easter

Blackfin5 · « **Reply #613 on:** April 04, 2021, 10:10:07 AM »

Well, I didn't de-rack the CR26s. Just removed bowls and jets for an inspection first. As it turns out, I really buggered up the previous cleaning. It is almost too embarrassing to post. I should be lashed on Easter Sunday. But first, I was wrong on the pilots. They are 55s and the mains are 115s.

Blackfin5 · « **Reply #614 on:** April 04, 2021, 10:19:39 AM »

So, first, the excuse and back story. The gravel driveway I washed out on is pretty bumpy and a 1/2 mile long. So I think it happened on the way to the main highway, 78 East. In addition, over the years I have learned to screw in jets barely more than finger tight and it was late when putting everything back together. This is the second time with bikes I have had a jet work loose and fall into the bowl.

I found the pilot jet sitting at the bottom of bowl #3. Yes, embarrassing, but relieved to find the problem. But wait, then I removed bowl #2, and found that the jet had broken off where the threads start. I remember it being slightly bent and I bent in back into shape ... I knew that is a big non-no, but with no spare and wanting to go for a rip the next morning, I screwed it back up. I was expecting it to be a total b**** to get the threaded part out, but with a small awl up the center it screwed out very easily.

I already ordered 4 new 55 pilots so I have spares; and 4 new 120 mains. I have wanted to try a size larger to compare anyway. It had to have happened on the gravel driveway before reaching the highway because when started it up it idled perfectly, and crawling along the gravel, it seemed great. But when on the pavement, chug, chug vroom, chug, chug. I will report back with good news hopefully after the new pilots are installed and tested.

Happy Easter.

Blackfin5 · « **Reply #615 on:** April 08, 2021, 07:42:29 PM »

Arrived. Good things do come in small packages.

RAFster122s · « **Reply #616 on:** April 08, 2021, 10:04:06 PM »

Hope your new jets do the trick. You get them from JetsRUs?

David

Blackfin5 · « **Reply #617 on:** April 09, 2021, 07:19:50 AM »

Jets R Us, yes. And in a few extra sizes. Stayed up late to install and tidy everything up. On opening the petcock, there was a small leak at fuel inlet on carbs due to jostling about. Will sort out in a bit and fire her up. Fingers crossed.

Blackfin5 · « **Reply #618 on:** April 09, 2021, 11:25:58 AM »

Fired up on about 4th attempt. I may have given too much fuel with CR choke circuit. Went with 60 pilot jets. I always thought the 55s were a bit lean at their top end as needles kick in. We will see. Going for a rip up the mountain in about an hour. With the 60s, she seems happier at a 1300 to 1400 idle after warm up.

Blackfin5 · « **Reply #619 on:** April 09, 2021, 01:23:37 PM »

Well, overall I'm pleased. Runs stll a wee bit rough until she powers above about 5500 rpm. I can't tell the difference between the 55 pilots and the 60s. It seems that similar 550 engine builds with CR26s use 65 pilots, but I live at 3200 ft elevation, so 60s may be better. I really need to dyno her, but that will likely be near sea level. 95% of my riding is above 2000 ft.

Blackfin5 · « **Reply #620 on:** April 11, 2021, 08:27:40 AM »

After a couple long rides yesterday, all I can report is the bike handles exceptionally well. I am giddy with delight. The jetting is a little off compared to last year. A bit rich. I tried opening the air screws 1/2 to 1 turn, which seems to help lower end response, and now taking off the bowls to drop the mains from 115 to 105 first, then depending on how it responds, back to 110 after looking at the plugs. Leaving the needle alone for now which is a Y8 at clip #3.

Blackfin5 · « **Reply #621 on:** April 11, 2021, 11:32:21 AM »

Boy, am I bad at jetting. Felt rich. Turned out air screws, and she ran worse. Then turned in 1/2 turn more than where I had them to start. Ran better but not perfect. Pulled plugs. They all look slightly lean.

Blackfin5 · « **Reply #622 on:** April 12, 2021, 09:54:12 AM »

Closer.....

Blackfin5 · « **Reply #623 on:** April 19, 2021, 01:52:41 PM »

All sorted . . . I think. It's based on plug chops at various throttle positions and butt dyno.

As a frame of reference, this 550's engine has JE 592cc pistons, lightened and balanced APE crank, Carrillo balanced rods, a MRieck Stage III head with +1mm valves, and a Web 358b cam grind, and CR 26 smoothbore carbs.

What I ended up with:

Main jets - 110
Pilot jets - 65
Needles - Y8 on 4th (middle) clip.
Air jets - 220
Starter jets - 35
Slides - 2.0
Air Screw - 1.5 turn out
Idles at 1300 to 1400 very well
No vacuum leaks

She idled better with 55 pilots at 1100-1200, but off idle as you roll on to 1/4 throttle, she runs better with 65 pilots. Go figure.

I'm very happy. Pulls evenly throughout the range.

News:

Author Topic: Danielle CB550K Build - Toyon Moto Club #5 (Read 89869 times)