Brad's Ultra Part 14. Carb Synching and more. Polaris Ultra Vintage Mod Snowmobile.
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- Опубликовано: 13 сен 2024
- Another step forward on Brad's Ultra! Lonnie Teaches us about carb synching. We do some other stuff too.
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I have 6 triples: 3 XLT's, 1 Ultra and two 800XCR's. Love the practical ( and knowledgeable) approach to syncing the carbs.
Also, really good beermanship!
On a Bing....1/4 inch drill under the slide, screw in the idle stop screw until it just contacts the slide. Adjust the top to take the slack out of the cable. Repeat for each carb. Done. Now you have a starting point from which further adjustments are made. A permanent marker vertical line on the idle stop screws from which reference is made to equal slide height above the carb throat.
I gotta sync my carbs thank you 🤘🤘
Hey boys, just want to say good work I love your videos. An old racer that I knew years ago told me take a straight edge and laid across the top of each carburetor with the Caps off to make sure they're perfectly level it says it makes a big difference I've always done it that way don't know if it does or not that's what I do. keep the videos coming
Great tip Glenn! Only takes a few seconds to do so we'll do it.
Hey guys! Love the videos! I finally subscribed to your channel👍
I’m a Polaris triple freak as well! I drag race vintage Polaris sleds up here in Saskatchewan Canada
Just wanted to say how much I’ve enjoyed your channel👍
Great idea on marking the idle adjustment screws👌 I’ve always had decent luck with using a 9/64 drill bit laying in the bottom of the carb throat and adjusting the slides until they come in contact with the drill bit
Keep up the good work guys!!!
Thanks for subscribing and welcome to the channel! The marks can be real handy for idle adjustments on the trails.
John, I usually tie my throttle cable down to approximately where it lands on the airbox. I have used zip ties and a broomstick or something to hold it in the ballpark. I found that the accentuated “s” curve that it makes when tying it down to the airbox afterwards will lift the slides a few thousandths. Every bit counts to keep away the famous triple bog
Right on! Brad is going to run pods or K&N on this, so I think it's pretty close. Might do a zip tie around the steering stem to get it closer. Thanks Spencer!
gday from down under im a new sub we dont have snow or sleds but you got me with the beer and dogs and triples i have a bsa rocket 3 cheers keep up the good work now chug
Awesome. Thanks for the sub. My first bike was a BSA B25, little one lunger. It was my daily transportation for a couple years when I was younger and lived in a warmer place. Cheers!
"I need beer." "Me too please" lol
You ever use the drill bit method? I usually start with a drill bit behind throttle so its slightly open. Then I use different size #drills until the bit just fits into slide with a slight drag but not enough to lift it. Then use the same drill bit on the others until the all feel the same. Basically feeler guage method.
I know a lot of people do that, but I think the machined surface of the carb is the most certain starting point. If it works for you, then by all means use a drill bit.
@@nuttersspeedshop Great vidoes. I've been watching a number of them. Brings back the good ole days for me. Snowchecked new a 95 XCR 600 monoblock and a 96 XCR 600 Monoblock. Both were great sleds for me. AFter that pretty much been on twins. I would be over to watch if closer and drink a beer.
Thanks for the carb sync part. This was a very good description. I wouldn't mind the carb rebuild part and maybe a little jetting info. You might have some of that in your other vids just havent found it yet. Cheers.
I might do a video on reading plugs, but as far as telling someone which jet size to use -- that is mega risky. Best bet is to always start rich and read your plugs as you work your way down to a nice cocoa color.
I usually do a carb sync by feel and it seems to work for me, nothing wrong with what your doing either. I suppose the correct way would be with a vacuum guage as each cylinder will pull a different. I know on a 4 cylinder 4 stroke motorcycle that makes a huge difference on idle and off idle response.
I've done the vacuum gauges on a bike, but never a sled. You have to have it running so you already have the idle screws turned in enough to run. Then you'd have to adjust the idle screws until the vacuum was equal and then work on the pull. I suppose if you idle it up another 500rpm using the flipper and then adjust the cables to even the pull it might work really well. I'll have to try it some time.
@@nuttersspeedshop no need to change your routine unless your curious.
As of now I dont even have worry about it, I have 2 sleds at the moment, one is a single carb and one is a rack of 3 carbs with all the carbs tied together on 1 throttle shaft. That one purrs like a kitten even though its a Yamaha lol
If I buy another sled it will be a 3 cylinder Yamaha ( oh the horrors!) 4 stroke with fuel injection. I suspect the throttle bodies will need a sync once and a while such as after a valve adjustment but otherwise should be fine.
Thanks Dan. It is an interesting suggestion. You may see more about it in the future.
Iron sharpens iron! I watch the video, read the comments, hope to God I'm smarter now than I was a few minutes ago! One of these days (soon) I'm going to have to try my hand at syncing carbs. I'll start with two and see how it goes! lol! Anyway, I really enjoyed the detail of your process and I know it'll help me get through my first experience. Thanks again for all you share with us! And oh... about the name... If you can calculate the number of beers that have been consumed while working on this sled, you can call it "Old #(whatever the number is)"... or maybe something cornier like, "Black and Purple Barley Slurple".... or throw up your arms and just settle for "Shop Slut" since she's spending time with all you beer crackin' gents!
Thanks Kenneth! I like Shop Slut LOL.
Brad is actually drinking beer with you lol
Sometimes he does.
Only when he runs out of "coffee"...
I’ve got a 1994 xlt sks that I wouldn’t mind getting it up to show quality I’m also located in Minnesota
Just wondering if you've done a video on adjusting the air mixture screws. I'm working on an Indy 500 Classic with flat slide carbs and it's a dog out of the hole. Can't figure out what's wrong.
I seldom work on flat slides. The Polaris service manual is really good. Also check your clutching.
So what’s the plan for this baby anyways? Drag sled? Or just a fun sled to blast around on? Has Brad decided yet?
Just blast around. Maybe a radar run or two.
I do this exact same method. All three carbs are synced at idle and pull at same time but they don't appear even with top of carb when wide open. Any ideas what I'm doing wrong?
Are you starting with the cables slacked off and the idle screws turned out so that you are working from the machined surface?
are they stock carbs
Yes. We put in V force reeds but the carbs are still stock, not bored.