Not only my first etc etc! - Exhaust Fabrication Done! Pics!

Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

Tim said:
No - I'm talking about a timing light, not a circuit testing light. It is a strobe light that connects to your battery for power, an inductive lead clamps onto your sparkplug wire, and it lights the strobe when the ignition fires, while the bike is running.

You point the light at your rotor/stator and you can see the mark on the rotor every time it fires, due to the strobe. So you see exactly where it is firing while running. And because you have a mechanical advance on the ignition, the point in the stroke at which the ignition fires actually changes (advances) as RPM increases. You want to see that happening when you rev the engine.

If it's showing up after the Advance mark on the stator, or wherever the manual says it should be firing, you rotate the points plate in one direction to further advance the ignition. If its showing up ahead of the mark, you rotate the plate the other way, changing the point at which the points make/break contact.

This is done on a VW Beetle, but it's the best vid I could find showing how the timing mark (in this case a mark on a pulley) shows up under the strobe.

http://www.youtube.com/watch?v=rDXDV0ZO280

ooooh, now I understand. Yes, I will have to get one of those!
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

You can also get tricky and advance the ignition beyond stock specs to give it a tad more go. 2 degrees is generally quite safe, and you can experiment from there if you really want to take it further.

My Chrysler Valiant, for instance, was running an abysmal 7 degrees advance when I was tuning it after fitting a high performance coil and dizzy. I overshot first time and ended up at 15' BTDC at idle! Sounded wicked but was overkill. I scaled it back down to a safer 12' BTDC at idle. This is still more than stock, but only by 2'. Goes better than it ever did.

As with any modification, make sure the engine responds well and isn't running too lean/rich/whatever before you take it on any considerable run.

Cheers - boingk
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

That's one thing I haven't sorted out yet - how to measure the actual degrees of the advance. I bought a simple timing light that doesn't have the advance doohickey on it.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

man that is wicked! nice work, have you checked ot ensure you have the right jetting in there, or your float is not geting stuck, have you bench synced the carbs?
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

she is caughing out of the carb 99% of the time that is jetting... what do your plug look like? i would be your running way to fat with no baffles and V stacks.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

JRK5892 said:
she is caughing out of the carb 99% of the time that is jetting... what do your plug look like? i would be your running way to fat with no baffles and V stacks.

plugs were wet with gas, which is the opposite of what I expected. And ya, Im definitley thinking I have to rejet, but Id really like to sort out my exhaust before I really get into tuning.

JRK5892 said:
man that is wicked! nice work, have you checked ot ensure you have the right jetting in there, or your float is not geting stuck, have you bench synced the carbs?

Im not even completely sure what bench syncing is, so no, heh. And the floats seem to be doing just fine, they maybe be a tiny bit high as theres a very very very small amount of gas in the overflow lines.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

So after charging overnight, I got the bike to run pretty easily today, but still couldnt get an idle. After changing the gap on the plugs, playing with the idle speed/mixture screws, having started the bike several times, it now doesnt want to start. So I seem to have other problems, but the charging system, or some of the connections coming from it are almost surely bad.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

so I took my carbs apart after reading that most rebuild kits come with random jets and not the standard 105/68/35. I didnt even pay attention to what sizes they were when I put them in.. and the rumors were right, I had 115/72/38 from the kits. So now I have to hunt down the proper jet sizes. I went by the big motorcycle dealer near me today and they didnt have any and told me that the best they could do is order rebuild kits for me. But I dont really want to pay for them to order these kits, then have them turn out to be the wrong jet sizes again.. also I only need 3 jets, not a full rebuild kit (30$ a piece.)

Another thing that I noticed is that I completely spaced out and didnt use new gaskets or gasket sealent on the carb boots, so Im pretty sure the reason I had such problems with the bike running was from air leaking in, and this would also explain why I had to turn the mixture screw out like 3 1/2 turns just to get it to run. So Ill use some of my yamabond on the boots and put the new gaskets on, and try again. The results should be better, and Ill also try to hunt down some proper jets and then I should be able to get her running consistently.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

So the carb boot gaskets seem to have been the culprit. After putting the new gaskets in there with some yamabond on both sides, the bike starts really easily. The bike idles quite nicely at around 1200rpm, but I still am getting this problem where the rpms will suddenly race to ~3200 and stick there, or they will stick there after I rev the motor. The left cyl is getting fouled by a little oil which I think is making its way in through the plug hole from the external leak since the bike is leaning to the left on the kickstand. The right cyl has a bit of carbon deposits on the plug, so its running a bit rich. But none of that explains the rpms suddenly sticking at 3200. Maybe the slides are getting stuck?
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

I'm realy digging this build. I think this bike would look nice with brushed aluminum hoops, black spokes, and a set of black pinstipes on the tins. 8) Hope you get the tuning problems whipped and get to ride her soon.
 
Re: Not only my first etc etc! [SHE RUNS!!!! VIDEO!!]

Just took my first ride on the bike. Since I still need to locktite some nuts and bolts and Im missing a cotter pin or two, I just went down the alley, then around the block and back into the garage. Sorry I havent been updating at all lately, but I havent had access to a camera and since I'm done with fabrication nothing much exciting has been happening. Hopefully I can get a riding vid up by the end of the week.

The bike isnt running perfectly, so now I have to tune. At start up the bike hates the choke, so it would seem that its running on the richer side, but underload the bike bogs down and backfires, which would seem like its running lean. Not really sure what to make of this. I am running stock jetting with open exhaust and open carbs (gotta figure out a way to get my velocity stacks to stay on the carbs, the hardware they came with dont help one bit, and I may just switch to pods anyways just for reliability.)
 
Re: Not only my first etc etc! [First ride!!!]

wow, I haven't updated this thread in over 6 months!!

I've just been a bit busy and did not have a camera. I rode the bike all through the fall and got it to run pretty reliably. I haven't had much time/money to put into the bike, but I have a couple of things left to "finish" the bike. I need to address the wheels and tires, figure out the exhaust (open pipes are fun for a bit, but in the end they are pretty obnoxious on a street bike), possibly remake the seat in aluminum and get it upholstered, fix the petcock (running cheap fuel shutoff valves from the two cross over tubes currently), and figure out some sort of mirrors/turn signals.

anyways, here are some long overdue pictures that I snapped in the garage last night.


DSC01242.jpg


DSC01234.jpg


DSC01243.jpg

rear brake linkage.. forgot who used this on their build, but I really like this setup as opposed to the bent rod over the swing arm method.

DSC01231.jpg


DSC01235.jpg
 
Re: Not only my first etc etc! [Finally Updated 1/11/11]

Very nice bud!!!!! man can not belive this is the first i have seen that sucker!!! hope we can ride a bit in the spring
 
Re: Not only my first etc etc! [Finally Updated 1/11/11]

Thanks guys. And ya Joe, we will def go for a ride when the mercury starts to rise again.

** added a pic of the rear brake linkage to the above post.
 
Re: Not only my first etc etc! [Finally Updated 1/11/11]

Man, I really was supposed to be born in California. I get pretty much nothing done on either of my bikes all winter, despite having a semi heated garage. But now that things are thawing here in Chicago I've suddenly got a ton of stuff going on with the cb350!

Just ordered a pair of Ikon 7610s for the rear. Almost went with 7614s, the aluminum bodied fully adjustable ones, but it just seems like even more overkill than the 7610s already are. The 7610's seem like a pretty good shock though, and they are rebuildable unlike the progressives and hagons which are in the price range just below these Ikons.

Also finally rebuilt my petcock last night. I had been running some cheapo plastic shut off valves from the crossover tubes to each carb, glad thats over with.

Oh and I ordered some bridgestone BT45s. I was going to go with Avons, but then some people convinced me to get BT45s, then after ordering some other people told me to go with Avons... so I'm really not sure which I should have gone with, but the BT45s are ordered (one actually arrived already), so I'm gonna give them a try.

I also have a little project going on that I'll save as a surprise when its done. I'm really excited about it, just hope it turns out as good as it is in my head.
 
Re: Not only my first etc etc! - Spring Thaw

So heres the little project. Found a SS merge collector and shorty reverse megaphone that on paper looked like they'd fit right on to make my open CL pipes into a sleek 2-1 scrambler exhaust. After a little frustration and a few cuts (both on the hearders and on my hands) I got it on there. As it sits now, it is like a millimeter from the shocks, so I will probably wait until I get my Ikons in the mail before I decide how to fix it.

One option to give it some room is to cut the headers further forward and move the merge collector forward on the headers about 14cm from where it sits now. This would put the merge collector on a part of the headers where they are slightly kinked out (then they tuck back in where the merge is now.) And honestly I'm kinda feeling that the system is a bit long as is anyways. What do you guys think?

21.jpg


2.jpg
 
Re: Not only my first etc etc! - Spring Thaw

cut 4 in out of the middle bud. way to long for that little scoot you going to do anything with your wheels? for some reason in all yur pics they just look unfinished with how clean the rest of it is.
 
Re: Not only my first etc etc! - Spring Thaw

Ya, I agree, too long. Its not WAY too long, and at some angles it looks good, so I figured I'd get a second opinion. After all, once I cut it, there's no going back.

I do have plans for the wheels, but they will probably have to wait until next year. Shouldered aluminum rims + custom spoke kits from Buchanan's are not cheap. Right now, the tentative plans for next year are wheels/front end swap. Not completely sure which swap I'll do, but these flimsy 33mm forks have to be upgraded. In the meantime, the new modern tires will make the wheels look a lot better and more inline with the flow of the rest of the bike.
 
Re: Not only my first etc etc! - Spring Thaw

i would say to paint or powder the stock wheels in black woudl really make a huge dif!
 
Back
Top Bottom