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2001 Yamaha Banshee (Re) Build thread


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Don't know if many people up here on the forum do build threads, but I thought it'd be cool to do one as it will also help me track my progress as well as get some input from some guys who probably know what they're doing a lot better then I.

 

Lets get started... Okay, so here's the story behind why I'm even here in the first place: Over spring break of this year, the guys and I drove down to Sandlake Oregon to ride for the day. To make a long story short, warm day, engine was running real hot and good, until it wasn't. About 10 minutes into my ride, I notice right where the exhaust exits the block, the pipes were smoking like a dick. I shut it off, looked around to see if I had a fuel or coolant leak dripping down on the pipes because the quad had sat for almost a year. Anyways, I come to notice the petcock shutoff valve was only a 1/4 pointed towards "on". Okay I thought, the CPI pipes sit a fingernail's length away so the vibration flicked it shut... no big deal right? Well, little did I know the damage was already done. Being the original valve, this cheap wiggly POS fuel switch just toasted my engine and ran me about $3,000. Ran it out way too lean and scored the cylinder wall. Over the next 45 minutes - an hour I noticed the engine losing power, so much to where my brother's stock 450r was pulling away. Needless to say, I figured I was screwed and decided to beat that thing like a rented mule while I could. My brother and I swapped for 10 minutes and decided to head back to the truck and take a break. Well, on the way back, I look over my shoulder and guess who isn't anywhere to be found? I knew right then, haha. Skip ahead, I go get a rope and the RZR in the group drags her back to the trailer and it gets put away safe. If there's any good to come out of this, it's that my brother was on it at the time so I have someone to blame! The day goes on, and more stuff breaks, and we go home. There she sat in the trailer in April, now fast forward to July. Now that I'm on summer break, I have some time on my hands. Started a couple days ago and as of yesterday I have it stripped down pretty much to bare frame with the exception of the tires and shocks to hold it up. Being only 17, this thread might not be the quickest growing but every time something comes along or parts arrive, I'll be sure to get them on and update this as much as possible. I work swiftly but have other crap to pay for.

 

I've updated my FB with all my progress, but to save time I'm sure you guys have a good idea of what I found. Chunks of metal and a stuck piston is what i found. I'll update this thread more very soon, and I would like to upload some pictures but I'm having trouble because the files are all too large. If anyone had any pointers around that problem that would be cool, Thanks! I'm excited to finally build a very fast, cool looking Banshee.

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Thanks for the welcoming everyone. Thanks for the pointers, I'll post them up now. Anyways, didn't play with it too much the past couple days as it's just a matter of waiting on parts at this point.

 

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- Here is what it looked like the day it blew up. This was shortly after I noticed it losing it's power so i figured I'd get that shot, Lol. Okay I'll shut up and get to the good stuff.

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- Just Starting to tear it down, basics are off. Can already see it looks way better (IMHO) without those beat up stock plastics. Like the Matte Black look already.

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- Only pictures I have of the carnage so far. When I pulled the plugs, (camera perspective) the right plug was very loose, as you can see above that dried shit out real good. Cylinder wall is very scored and little chunks of piston are M.I.A. Made my own little maraca out of the exhaust pipe.

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- Pretty much how it sets now except the accessories are removed and I put it on the dirt tires. I'm going a-wall with this thing, hopefully I can do it. More updates to come soon guys!

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Sorry for the late response. Didn't get on here much yesterday night or today. Thanks JTmachining!

The right cylinder blew up, yeah. Scored the wall and ran it lean. Molten metal at that point.

In response to BlueBanshee98's question, I'm trying to get some money together for the engine, as that's obviously the biggest financial speed bump. My dad has talked about helping me. In the process of selling my car so that should help too. I'm sure the 421cc Cheetah kit by Cascade Innovations will run about $3,000 and I'm going to try to use as many parts off the old engine as I can. I have V-force 3 reeds, some good air filters, and some other little stuff to help out with performance although I'm unfamiliar with what comes in the kit. I don't have time to build another engine nor the space ATM so I'll have to order an assembled one. If it comes with all the parts I'll sell the old one as is, the way i pulled it. Bought the quad from my friend for $4,000 the way you saw it above, and I'm sure another $3-$4k is going to go into it. Going to try and make some of it back by selling my 2004 Banshee and any parts off of this one.I'm sure through the internet and resources I could have a running, redone 350cc engine back in the bike by next week for a couple hundred, but I want to change it up and if I decide to go out again this year I'll just ride the 450. I'll get on here tomorrow. Goodnight dudes.

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Slow going recently, just sitting around waiting to be put back together. Torn between rebuilding my bad engine with a Cheetah kit, or just buying a built one to save time. My friend knows a guy who builds them up so I may just go that route.

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  • 8 months later...

I feel so lazy! Anyways, the Banshee is done! Planned to work on it through the midst of Winter but got into a motorcycle accident and broke 8 bones. Pretty slow goin' Winter with the recovery. After I heeled and got back to work, I was able to find the time to get it done. Ended up buying an engine and adding my touch to it. Runs great, and coming back with a new look! Hitting the dunes for Spring break so we will cross our fingers. Without further a do...

 

- 370cc (bored .80)

- Welded crank

- VForce 4's

- Billet cases

- CPI pipes (off my old engine)

- Cool head

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 17554359_1933114450290633_85748624529121

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