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  #121  
Old 20th July 2020
wedge's Avatar
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Let me know how this comes out. If it is still lacking, you can go bigger on the main until the roll off puts you flat on your face, then you will know the upper limit and can back up to what works best.

What is that carb? I want to look it up and get a better idea what we have here.
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  #122  
Old 24th July 2020
Hornsmith Hornsmith is offline
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The carb is a c40. It's a blast carb, and the stock difference is that it doesn't have an accelerator pump and it has an auto choke. I got a kit to eliminate the auto choke and replace it with a normal sportster choke, and I put an accelerator pump on it. I did that by putting on a sportster float bowl and drilled a hole where the pump nozzle protrudes into the carb. I also added the linkage for the pump of course.

The carb itself is essentially just a cv40. The jets and slide and diaphragm are all the same type.

The engine has been modified with a Andrews B50 Cams, an NRHS 515 kit, a new exhaust system that I made, and an intake that is basically a velocity stack with big filter clamped around it.

I put in a 180 jet today, and tested a 170 and a 175 a few days ago. The 180 did not improve over the 170 or 175.
With the 170 jet, it had a surge of power when rolling off the throttle.
The 175 and 180 don't do this, but neither of them improved the top speed. However, they don't misfire as much when accelerating. Or maybe I've just become better at modulating the throttle to avoid that.
With the 180 jet, it makes a loud bang a second or two after I shut off the bike. I presume this is too rich :P

When going downhill, the bike has no problem getting over 60, but that makes sense, what with gravity and all. The low top speed might be related to the fact that all the freeways around where I live are fairly steep uphill, but I don't think the bike should be having this much trouble.
Also, it's possible that I am shifting earlier than would be ideal. Not by a lot, but I could try to string out the lower gears more. Even so, I would think 4th and 5th gear would be ideal for 50 mph.
I'm gonna put the 175 in and check that out again. Also I'm gonna put a larger front sprocket in. It would help with the chain tension because the idler sprocket I put on doesn't have a huge amount of travel. If it doesn't work out I can easily change back, so I'm not too worried about that.
Also I'm wondering if my exhaust is too restrictive. It's definitely possible, but it would be pretty annoying to cut it open and reduce the chambers obstruction. I can see how that might be the culprit. I welded some v shaped baffles into the pipe to muffle it, and they might be causing a loss of power at high rpms where the air is flowing real fast.
Anywho, lots for me to think about.
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  #123  
Old 24th July 2020
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rokytnji rokytnji is offline
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Yeah. Might need to re-think gearing a bit since a custom geometry is being introduced.

Raised. lowered. Lengthend. etc......

Apples and orange comparison. My Husky SM 610 super moto thumper with a six speed.
Handles Texas freeway speeds OK. From 75 MPH to 80 MPH. Uphill pulls like a tractor.
After reading about all the fun certain members here had on roaming the countryside on dirt.

It just made sense to me to just get a bike already set up for something I had no clue about. Instead of converting one of my street bikes to dirt.

Yeah. Something is off. You move too slow. Wedge should have the carb know how. I only put kit's in mine when they wear out.
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  #124  
Old 25th July 2020
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Yes, I agree, the 175 will do it.

Also I agree, you need to correct any possible restriction in that exhaust. Try pulling out the stuff you welded in and see how it acts with nothing in the way at all. Single cylinder 4 stroke bikes used to run really well with a hand made megaphone. The old 100cc (bored out 90's) and 125cc Honda's used to get one of those in early motocross.
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  #125  
Old 28th July 2020
Hornsmith Hornsmith is offline
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I just put in a 175, cut out my baffles, changed to a different air filter, and put on a 22 tooth front sprocket. Around town, it seems faster. Significantly.

I put on a different air filter because the big car filter I had on was close to my leg and I don't want to knock my carb around and make it leak or something.
I added the 22 tooth sprocket because the chain slack was unmanageable and there wasn't enough adjustment in the system. The new sprocket allowed my to loosen the idler while changing the geometry enough to keep it tighter throughout the swingarms movement. It is overall tighter and has more room to adjust the idler for chain stretch down the road.

The 22 tooth sprocket may also give me better mileage.

It would have better acceleration with the smaller sprocket, but the changes to exhaust seem to have really improved it. Even with the bigger front sprocket it's significantly faster around town. I really felt the pull, which was quite nice. I didn't go on the highway today, but I will test that soon.

However, it is really loud. Waaay too loud. I don't want to get pulled over for volume. I bought a quiet baffle that I should be able to put in it. I'll see how that works out.
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  #126  
Old 29th July 2020
Hornsmith Hornsmith is offline
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I just went for another ride, this time with a 170 jet.
No noticeable difference from the 175.
Additionally I did a test at full throttle going about 40 mph. No misfiring anymore. I think it was my homemade baffles causing the trouble. Also, mercy upon all unshielded ears. Hehe
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  #127  
Old 6th August 2020
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Quote:
Originally Posted by Hornsmith View Post
Additionally I've started welding a wee bit. I'm very much a beginner, and don't have a welding machine, but I've been using old spare motorcycle batteries wired together. Three wired up makes my than enough to use stick welding rods, and I've extended the kickstand so it can touch the ground.
The setup splatters a lot of metal though, and I can only run the batteries for a few minutes before they start to get low. Then I charge them for an hour or so and continue. Not efficient, but hey, that's what I got. I'm gonna try some thinner sticks and only two batteries and see how that goes.
I think you passed up a great opportunity for a "sua sponte" photo of how to get something done without following the usual, recommended, expensive approach. I'd love to see that pic show up in the Instagram feed.
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  #128  
Old 6th August 2020
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apotheon apotheon is offline
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Quote:
Originally Posted by Hornsmith View Post
I just went for another ride, this time with a 170 jet.
No noticeable difference from the 175.
Additionally I did a test at full throttle going about 40 mph. No misfiring anymore. I think it was my homemade baffles causing the trouble. Also, mercy upon all unshielded ears. Hehe
This thread has been a heckuva ride. Yes, I read the whole thing. I'm impressed with your ingenuity and dedication. I hope to aspire to eventually achieve half of that.

Keep up the good work.
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  #129  
Old 7th August 2020
Hornsmith Hornsmith is offline
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Haha yeah it's been a crazy time working on this thing. The battery welding was a long while ago. My crappy stick welding machine was a major upgrade, though I also have a lot more experience now. It would be interesting to try battery welding again and see how I do these days.

Also some notes on muffler design. I've tried the bike with a baffle insert and with it straight piped. The baffle makes it a bit quieter, but still louder than I really want. Also, it has significantly less power with the insert than without. I'm gonna try my hand at making another chambered muffler, but this time with more focus on keeping it free flowing.
I'll upload some pics when I've got something to show.
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  #130  
Old 12th August 2020
Hornsmith Hornsmith is offline
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I've tried my hand at making a muffler to no avail. My welder and my skills are not enough :P
I've bought a muffler that will fit into the header that I made and it should work nicely.
Additionally, I've learned a great deal amount my bike. One of my problems is my style of riding. On my Honda, I can easily tell how high the revs are, what with it having a tachometer and an exhaust that makes the revs easy to hear. Some more testing with the blast has led me to conclude that I have been shifting too early to optimize power. It's hard to acknowledge my own failure but awe well, such is life.
More experience with Evo style engines would have been very helpful I think XD
I really ought to invest in a sportster. But that's for another time.
I'm gonna wait for the new muffler to arrive and update y'all then.

As a side note, I'm thinking about going back to the stock cams. I believe my Andrews B50 cams have the power a bit higher in the revs, while the stock ones would be better for my style of riding. I'm not giving up on them quite yet though. We'll see how it goes with the new muffler.
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