LS3 Machine

Yeah T5s like 27.5 jets... I kinda assumed that's what he already has..... so if you don't already have 27.5s, try them. If you still have problems, you can try one size smaller and one size bigger.

Pick up some 290 and 280 jets as well... we gave you a starting point. Floats are checked with the bottom part (bowls) removed..... Im pretty sure the procedure is in the manual. Its easy to do.

So what ever happened here? Did you rebuild yet?

Hes not ported, 300 should be good for him.

25/300 Check out the jetting forum. Also make sure you do the following: 1. Make sure carbs are clean 2. Check Float height 3. set air screws 1.5 turns out 4. Sync carbs

Well the main sounds a size or 2 too big, there is a good chance that the pilots are a size or 3 too big. It seems that people are so paranoid that the jet these things too big all the time.

A tune up can be anything from just new spark plugs, to new plugs, and adjusting, cleaning, and re-jetting the carbs. Don't worry, Banshees are easy to work on, and you might as well learn to work on your own stuff now. Its way cheaper that way, and Ive come to trust my own work more than some motorcycle shop (not counting racing shops that specialize, like the forum vendors here). You get a great feeling of satisfaction after yopu dio the research, readuing, and work yourself. We will help you through the process. Im new and Ive alreadyy done lots of upgrades and carb re-jetting, etc. with no problems. Just make sure you buy the cleanest, closest to stock (aftermarket pipes are a good option) Banshee that you can afford. Don't but a POS, it will cost you more money and headaches in the long run. Good Luck and keep us posted. PS- You will luv the Banshee... they are awesome bikes!

Whats ever happened with this bike?

So if you are near idle and try to accelerate away smoothly, it hesitates, then goes? If it is this, Im going to guess maybe partial clogged pilot jet... if it is a mid range bog, Im going to say needle clip position. If you have T5s, and not much else on the bike, it prob has the toomey perfect jet kit, which is very good jetting setup. Testing in first or second gear is not good, as the gearing helps out too much with the acceleration. Best to test in 4th or 5th from low RPM. We need accurate and detailed description of what the bike is doing... what RPM range/throttle position... etc...

If your budget allows... I would say the newer the better (even though they have nit changed much over the years). Of course the cleaner and in best overall condition would be great. Maybe close to stock, with just bolt ons would be good. Bring a compression gauge to test the overall engine health out. It seems to be a buyer's market with a crappy economy, and the fact the 4 strokes are now way more popular. Find one from a forum member would probably be a good idea as well. I guess it all depends on your budget and goals with the bike. Do you plan on rebuilding it into a monster? Or just a fun play bike? The early ones had J arm front suspension, which is hard to get aftermarket support for.

U unscrew the big cap on the top of the carbs, and pull out the entire assembly. Then the needle should be hanging there. Push it up out the top I believe (I haven't messed with stock carbs in a while). Its not that hard to take apart, it's getting it back together that is the fun part. You have to hold your tounge just right to get it back together. Just make sure you do one at a time. The pilot jets are responsible for the first 1/4 throttle, but the transition immediately above that range is the needle. I agree with the air mixture screw comment.

Is the hesitation in the mid range? If it is it is probably the needle (assuming everything is in good working order).

My LSR A Arms worked good. Contact LSR and see what they say.

Super easy. Take top cap off carb, pull out slide and needle will be in the slide. Pop the needle up, and use a needle nose to remove the tiny e clip. Move the clip one notch up, as you have a rich stumble. Reassemble and repeat on other carb. Move only one notch at a time between test rides.

So you have a sticky slide It sounds like? Clean and wd 40 the carb, and u should be good. Also make sure your air screws are set the same amount, and recheck your sync after reassembly.

What he said. Welcome to BHQ. Very nice banshee! I would also ask...... I wonder why it was rebuilt already? It could be one of 2 reasons: the guy that owned it jetted too lean, and blew it up... Or.... He was just power hungry, and got new pistons while he was getting it ported. I tend to think he might have just been power hungry.... But I recommend you throw in some new spark plugs, ride it a bit, and check the plugs to see if it's lean, rich, or just right. Anyways... Welcome, and enjoy!

Welcome again.... Looks like a nice shee! I think that is laker plastic? I'm no expert. You are definitely doing the right thing changing to fresh premium gas, best mix is around 40:1, and making sure the carbs are clean. I would get new spark plugs, and check out the condition of the carb boots and the crosstube between the carbs. Basically make sure all the carb plumbing is in good shape. Looks like in has v force reeds as well. I think the 280/27.5 setup is what toomey sends with their perfect jet kit, and it's pretty darn close to where you need to be. I also recommend you do a compression test. sync the carbs, and yes there are delete caps is a good idea as well. Fast racing sells a sync tool, as well as any other parts you may need. Good luck and keep us posted.

Welcome to BHQ! Tell us about your new Banshee, and post up some pics! Is it running good? Post up your questions.

The bike is now 6 years old. That means it's been ridden for 6 or 7 years. Definitely sounds like the one side is not doing so well. I would consider coming up with a minor rebuild budget. What I would do if i was in your shoes: Budget around 400 bucks: Get new pistons, have the cylinders bored by a forum vendor that will sell you the pistons, get new carb boots (they are 7 years old), upgrade to pod filters, clean and rejet the carbs, new plugs, and sync. (check the reed condition while you are in there, as they may need replacing) Around 700 bucks: Add Cylinder port job from the forum vendor. 1000 bucks: Add Cool Head and domes. Does our bike have stock exhaust? Good Luck and keep us posted!

I agree, great vendor, they hooked me up too!

The A Arms look a lot like my LSR A Arms, but the LSRs have big labels. They look like they might be +2 +1, which is the most popular upgrade size, but no way to tell from the pics for sure. If you got a good price on the Banshee, that is sweet! The Elkas made my Banshee ride so smooth!

I enjoy working on my Banshee almost as much as I enjoy riding it. But my situation is different, I don't work on peoples cars or bikes for a living. I recommend that you do a top end rebuild and get the cylinders ported (by a forum vendor) while it is taken apart. Get new carb boots, plugs, check the jetting, sync the carbs, and be done with it. Then all you have to do is ride it and minor maintenance. Just suck it up enough to get it running perfect, and be done with it. Yeah Im sure you get tired of turning wrenches.... but just think... This is YOUR BABY! A properly running Banshee is sooooooo frickin fun, you will be happy you listened to me, and you will probably keep the bike forever. People that get older Banshees and never get them running just right, and end up selling them are REALLY missing out on what a fun bike it is. The Banshee probably has better aftermarket support than any ATV in the world, and can be made to suit any type of riding or racing you care to do... plus you can embarrass the 4 stroke crowd with your old school (lack of) technology. So just suck it up a little bit... and you will be glad you did.

If you ordered your parts from a US Shop, and told them to set you up for 98 Octane, they set you up for a US based Octane of 98. The European Octane Rating of 98 is about the US Octane Rating of 91 or 92. I know this for a fact, Im not guessing. I have lived for years on both sides of the pond. If this is what happened, it is 100% the reason you have the bad damage to your pistons. You will need to rebuild, and when you rebuild the engiine, if you use parts from a US shop, tell them 92 Octane (unless you are wealthy and just like rebuilding engines). Research Octane Number (RON)The most common type of octane rating is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane. (USA uses RON divided by MON - Tim) Motor Octane Number (MON)There is another type of octane rating, called Motor Octane Number (MON), or the aviation lean octane rating, which is a better measure of how the fuel behaves when under load, as it is determined at 900 rpm engine speed, instead of the 600 rpm for RON.[2][3] MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern gasoline will be about 8 to 10 points lower than the RON, however there is no direct link between RON and MON. Normally, fuel specifications require both a minimum RON and a minimum MON. Anti-Knock Index (AKI)In most countries, including Australia and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States and some other countries, like Brazil, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

Oops. Thanks. When I had my bottom end too lean (pilot jets), it made a popping sound when rolling on the throttle at the beginning of 1st gear. It might be better if you zip tied the camera on the bike, but IDK if it would pick up too much wind noise that way.

V8hunter were you on a Diamond Star Forum?