|
|
Post by lordverminaard on Aug 24, 2023 9:40:53 GMT -5
Very nice work! What modeling package do you use? The Free version of Fusion right now. I don't love it, however I am not really sure what to expect since I've never had any design education or experience doing this. I also gave Onshape a trial but I felt like it was worse. I might try it again now that I have a handful of hours on Fusion and understand more. |
|
|
|
Post by lordverminaard on Aug 24, 2023 10:09:15 GMT -5
A little preview, while I had a half hour before dinner last night.  Bolts up fine, and my jet adjustments seemed good, as it start and ran and idled nice right away. The only additional modifications needed were to the cable tube and adjustment knob. The 90-degree cap and tube from the stock Bajaj carburetor fit on the PZ carburetor just fine, but the cable adjustment and threaded portion on the tube were too long, so I cut the tube threaded section by about half, and also cut the brass adjustment collar about half as well. I made a quick adapter out of another cable adjuster I had laying around so that if I go back to the stock carburetor it will fit fine. I should have left the boot off so you could see what was done but it's nothing special. Initial ride shows it's still a little lean at 1/4 throttle, with the next larger pilot jet in it, it would not idle quite right and was very rich at idle, I didn't bother to tune the fuel screw or anything last night so I might be able to tune it out. I also will probably put the stock intake boot and air filter back in, the cone filter is very noisy and not in a good way, lol. That also might be enough to richen up the bottom end. A quick video, it never hot-started this easy on the stock carburetor. Also, I don't have the choke cable hooked up, I'll need to fab a little bracket to hold it since the lever is on the opposite side on the stock carburetor. I have never used the choke on the stock carburetor, so I'm not gonna worry about it right now. I also need new mounting hardware as these bolts (that came with the PZ carburetor) are a little short so I'll fabricate that up when I replace them. More to come soon! |
|
|
|
Post by chadbullet on Jun 14, 2024 8:55:51 GMT -5
Currently looking at a Legend, and I'm wondering if this carb swap yielded any better performance for you after getting it dialed in...
|
|
|
|
Post by lordverminaard on Jul 8, 2024 12:14:14 GMT -5
Currently looking at a Legend, and I'm wondering if this carb swap yielded any better performance for you after getting it dialed in... I ended up going back to the stock carburetor. I had a couple flat spots and bogs at certain throttle positions that I could never really tune out effectively. It would run really well part-throttle up until about half throttle but then it would bog a bit with more than that in the mid-range, then again all the way at the top of the rpm range. There is a PZ22 version of this carb as well and I have a feeling it would probably be more appropriately sized for this engine. But I am devising an EFI conversion for it now instead of messing with carbs anymore. But I think the 26 was just too big for it. Brendan |
|
|
|
Post by lordverminaard on Jul 8, 2024 13:03:52 GMT -5
Well I guess it's time for a yearly update! I've been busy as hell- work, side jobs, and a new side hustle- maintaining two YouTube Channels- one for my music endeavors (I also have played bass for Pauly Shore on two of his Virtual band videos so far...what???) and another gaming channel that for whatever reason is growing steadily and providing a bit of income. What a bizarre thing at this stage of my life but hey I will take it! Only done a few minor things to the Chetak since last year- as mentioned in my previous post I went back to the stock carb, I have a PZ22 carb on the way since they are so cheap I may as well give it a shot and see if it makes any difference. I also bought a cheap exhaust kit for a 125cc pit bike that I will cut up to make a new exhaust since it has the same header flange. For the slightly more distant future I am scheming up an EFI solution because if I can, I will- lol! The front drum was warped, and apparently was a common problem on these with some of them being machined out of round. I bought a replacement drum, and took the time to paint it up nice and then do the same to the rear one and after getting it all back together it still shakes under braking. FAIL! I dunno if I got a new old stock drum or if the replacement was also machined incorrectly. I have called all over Columbus and can't find a single person in a city of 905,000 people someone that can machine this drum true. So gonna live with it for now even though it's the thing about this bike that bothers me the most right now. I am working on figuring out how to install the beaded floorboard treatment like a PX but I was able to remove the center piece and attach a PX style center trim which improved the look quite a bit.  I also fixed that little dent on the cowl.  Someone in the Bajaj FB group showed how they attached the spare tire under the left side cowl without a bunch of modifications, I was originally told you needed a Vespa Cosa battery bracket, which would involve drilling new holes and using rivnuts in the body to attach it and then a different sized battery and all this nonsense. The Bajaj bracket has the holes there already but they use one of them as a wire feed for the starter solenoid, so a bit of re-arrangement and some bolts and washers and it fits a treat this way!  So of course I will loose the little compartment in the cowl- which was easy enough to remove. But it wouldn't close with the stock key latch mechanism, and I didn't want to hack it up so I 3D printed a little plug/lock so now the door can't open.    Nice! This is something that I have wanted to do for a long time, not that I was worried about not having a spare but it just looked weird not having anything sticking out from under the left side cowl. Next up, new grips. My Vans grips turned into a sticky goo by the end of riding season last year, only lasted 3 months.... which is bizarre because I have never seen the motorcycle versions of those grips doing that. I have a set of grips from Ergon coming that should be really cool and hopefully they will last longer than 3 months. They are German made so hopefully they will be a little more robust. Speaking of German made, there is a local guy that has two Zundapp Bella scooters, absolutely beautiful machines that look like they came out of Italy but are actually German. They are engineered like German machines as well but it amazes me that they look the way that they do.  Anyway, that's all for now! Brendan |
|
|
|
Post by aeroxbud on Jul 9, 2024 3:54:52 GMT -5
It seems there is always some to do on a scooter.
Have seen a few of those Zundapp scooters here.cool looking, and don't go for a lot of money.
Must be a lot rarer in the States than here.
|
|
