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Post by lunatuck on May 21, 2021 6:00:09 GMT -5
What main jet are you running ? The fuel screw if you tighten it down is cutting off fuel making the mixture leaner and would raise your idle . Does it sound different When running? Compression Test would tell us if you were down on power so it wont help with this issue . The Leak down test will narrow down if it is a air leak and where it is with some soapy water sprayed around just like we did to find leaks in bike tires . Running a 98 main, 42 pilot now. I’m looking into getting the leak tester parts. Only issue is my intake doesn’t have a clamp style. Its bolt on. The 42 pilot sounds better when running then the 45 did. The 98 jet is almost indiscernible from the 96 and 94. |
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Post by Zino on May 21, 2021 8:22:08 GMT -5
I have the same carb .
42 pilot sounds close I like a 38-40 .
the 98 main sounds big compared to me running a 82 to 84 unless you run a open filter .
Have you checked if your exhaust is sealed up tight ?
When its running if you take a wet rag and plug the exhaust it should kill quick.
The seams around the carb connections are easy to track down .
The cylinderhead gasket and base gasket are other areas that leak.
There is one seal on the crankshaft that you can reach behind the starter plate easy enough .
The hardest area to check is seal behind the stator .
You need a flywheel puller .
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Post by lunatuck on May 21, 2021 8:33:43 GMT -5
I have the same carb . 42 pilot sounds close I like a 38-40 . the 98 main sounds big compared to me running a 82 to 84 unless you run a open filter . Have you checked if your exhaust is sealed up tight ? When its running if you take a wet rag and plug the exhaust it should kill quick. The seams around the carb connections are easy to track down . The cylinderhead gasket and base gasket are other areas that leak. There is one seal on the crankshaft that you can reach behind the starter plate easy enough . The hardest area to check is seal behind the stator . You need a flywheel puller . Yeah. I think it's a leak. I started it this morning and it was idling low and smoking. Plus, the whole fact that I'm increasing the main jet as it gets warmer makes no sense.
I did check the exhaust.
I ordered most of the parts for the leak down test. I had noticed that the flywheel fan is making a different noise, so I'm thinking it could be coming from there.
Today, I'm going to take the whole head apart and see if it's anything obvious. Otherwise, I should have the parts for the leak test some time next week. Maybe I need to order the flywheel puller. I have a basic one, but not sure if it'll work well. It's kind of rusty and ugly.
Bad timing for the scooter to be out of service. So nice out! But at least I can expect to get some better performance when all is said and done.
Just fired off the parts canon. Have everything I should need coming. I wish I had one of those nice rolling tool boxes, but they're so pricey! I think I'll buy one for my birthday in June.
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Post by lunatuck on May 21, 2021 18:37:05 GMT -5
Took a bunch of stuff apart, but the head and base gaskets look fine. The two issues I see are the exhaust gasket looked bad and had a slight leak that built up oil. Also, there is a slight bit of oil under the spark plug temp sensor. I’m hoping that a new exhaust gasket and possible new spark plug with the squish ring will prevent the hanging idle. I’m also going to try to realign the exhaust bracket holes because they may be putting odd tension on the exhaust preventing it from sealing.
Hoping to try and pressure test tomorrow if the parts all show up to see if I’m on the right track.
Hmm. I’m also noticing a clicking when I rotate the flywheel back and forth. As if theres play somewhere. Not sure if thats normal.
Also, it may just be the flywheel fan, but it has a slight wobble. Guess I need to remove the flywheel to see if it’s the crankshaft.
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Post by lunatuck on May 22, 2021 7:39:47 GMT -5
I removed the flywheel fan and ran it for a few seconds. The sound is greatly reduced and there doesn’t appear to be an wobble in the flywheel itself. Whew!
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Post by lunatuck on May 22, 2021 10:21:17 GMT -5
Hmm. Wondering about my Malossi Dellorto carb. It has an elbow for the throttle cable. I don’t believe I instaled the boot because it seemed like you use the elbow or the boot/strait piece. Maybe it’s my carb leaking air.
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Post by aeroxbud on May 22, 2021 18:22:44 GMT -5
Took a bunch of stuff apart, but the head and base gaskets look fine. The two issues I see are the exhaust gasket looked bad and had a slight leak that built up oil. Also, there is a slight bit of oil under the spark plug temp sensor. I’m hoping that a new exhaust gasket and possible new spark plug with the squish ring will prevent the hanging idle. I’m also going to try to realign the exhaust bracket holes because they may be putting odd tension on the exhaust preventing it from sealing. Hoping to try and pressure test tomorrow if the parts all show up to see if I’m on the right track. Hmm. I’m also noticing a clicking when I rotate the flywheel back and forth. As if theres play somewhere. Not sure if thats normal. Also, it may just be the flywheel fan, but it has a slight wobble. Guess I need to remove the flywheel to see if it’s the crankshaft. That clicking is probably the starter clutch. Would be easy enough to check. |
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Post by geoffh on May 23, 2021 8:31:52 GMT -5
Carbs don't,t leak air my dellorto PHVA has an open to fresh air port,so you can cross that off the list.
Geoff
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Post by lunatuck on May 23, 2021 10:59:34 GMT -5
I thought I had it fixed. This morning I took apart the carb. I put it back together and noticed a difference in the idle rpm. It was idling at about 2000 RPM instead of 2600-3500RPM. So I took it apart and put it back together a bunch of times and sometimes it would idle higher, sometimes lower. Then I noticed the cable barb was in the wrong hole like it could easily pop out. I put it into the correct hole and reassembled it and the idle was back to my normal 1600RPM. The hanging idle also mostly cleared up. It just had a slight hang that was more like a tuning hang, not a 20s long hang. So I decided to move the needle clip down one step and I couldn't reproduce the hanging idle from revving it. It seemed like a perfect idle and snappy throttle response in my garage. I knew the only way to truly test it would be to take a ride, so I decided to bring it to work about 2 miles away. About halfway to work I realized I forgot my keys, so I turned around and went back. I got my keys and continued on. About halfway to work again, the idle hung a little bit; but not nearly as bad as it did before. Now, the main jet is very rich and I could feel it. So it's possible I'm just richening out any air leak, but I thought with all of the stuff I had done there was a good chance I fixed it. So far I've... -Re-attatched exhaust with better seal.(There was a leak at the exhaust, but no more) -Honda bonded the air box boot to give it a better seal. -Inspected every seal and gasket with the exception of the flywheel side.(puller showing up today) -Got the carb cable issue sorted out. The slot holding the cable in the slide and the plastic piece was rotated in a way that put an odd twist in the carb slide. -Checked all carb>intake gaskets. -Tightened the spark plug and temp sensor with a better wrench for a better seal.
Tomorrow the pressure gauge shows up, so I can finally test it all properly, but it's a lot better then it was. Even the temps seemed 20F lower then usual. I'm not sure if the exhaust leak itself could've caused this. I do have a new exhaust gasket showing up. I'm also wondering if the acorn nuts are possibly bottomed out. I want to try new non-acorn nuts. So I plan to finally pressure test it tomorrow. I am tempted to drop the main jet and drop the needle clip once again. If the exhaust leak was the culprit, then it'll need to be re-tuned with the leak fixed. I should know a lot more tomorrow. |
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Post by lunatuck on May 24, 2021 12:16:52 GMT -5
Got my parts and sprayed everywhere looking for leaks... Check out where I found a leak... youtu.be/RI0bwQr0feUIt seems there is a pinhole leak on my actual intake. Not between any interfacing surfaces. I can’t imagine this is common, but glad I found it. Over 20m it lost 1/2 a psi. Hoping thats all. Wonder if I can jb weld it from the outside. |
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Post by lunatuck on May 24, 2021 12:53:47 GMT -5
It also looks like my reeds are showing a little daylight through, but spinning them around doesn’t seem to help. It’s as if the stop is bending the inside in and forcing the outside out. ibb.co/DfHPwS0ibb.co/ggCHVgyEdit: I was able to get the reeds to seat by spinning them around and switching sides. I think that was actually my biggest issue. I ordered a new intake and hope it’ll show up quickly. For now, I’m going to see if some gasket maker will patch the hole. Its so small! I can’t even see it, but it bubbles. Must’ve been a bad casting. |
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Post by lunatuck on May 24, 2021 14:12:02 GMT -5
And my ugly, but effective pressure tester...  |
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Post by lunatuck on May 24, 2021 16:13:18 GMT -5
Hanging idle gone!
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Post by lunatuck on May 29, 2021 10:28:52 GMT -5
Next plan is to find a way to get my WOT rpms up to 9250rpm. Before I installed the stronger contra spring, I was in that range and getting a bit more to end mph. I gave it up to get better hill climbing. Now my hill climbing is screaming, but I want to find a happy medium. I ordered a Malossi white contra spring which should be sightly stronger then stock. All I need is 1g lighter rollers. I'm at 6g now. I think I'm on the right path, because I noticed the NCY springs are taller then stock. I'm thinking that means it may be stronger then a 1k contra spring that would be the same height as stock. Gotta do some trial and error.
I also finally found an 8 mile road that is almost perfectly flat. It's about 20 minutes away by car, so I'm hoping to get the scooter over there so I can finally do a flat top speed run. I had to use Google Earth to look for candidate roads and realized that my only hope for finding flat roads is finding a large river and following the shoreline. I'm excited to finally be able to do a top speed run longer then 1/4 mile because my new gear up kit needs some space to gain speed. I actually saw no speed gain on my normal jetting run because it's too short. So I think I'm about to break my (gps confirmed) speed record by 5-6mph. At least that's what my math tells me. Based on speedometer offset, I'm sure I've gone 55mph+, but I don't count it until I get a recorded GPS video.
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Post by Zino on May 29, 2021 13:51:46 GMT -5
Sounds like you found your fix .
That exhaust leak combined with the intake leak may have just been enough to cause the biggest problems.
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