Nice. I had one, wish I hadn't sold it. There's not many around. Milling the head does alot & a pw fmf pipe will fit. You can also remove some of the clutch balls for a higher catch point.

 

Here's my BW80. Mods include: aluminum wheels, gull winged top clamp, heavy fork springs, tall bars w/ motion pro throttle and push button kill switch, modified airbox, eliminate oil injector, ebay pw80 pegs, fastace reservoir shock w/550 lb. spring, chain roller and chain guide, dual exhaust (why not?) cut down kick starter, taper steering bearings. A great bike for the campsite, easy to ride for kids and adults.....

Dude, that thing is cool! I like those aluminum wheels too!

 

looks dope!

 

I was wondering about the FMF pipe, did you have one on a BW80? I did the clutch ball removal but have left the motor stock other than Boyesen reeds and 1mm off the head. How much did you mill off the head? Thanks guys...

 

Fmf pipe bolts right on. 1mm I believe off the head. they're like 6 to 1 stock so it's really low. Porting is supposed to do major things on that motor too. I didn't have mine done.

 

Good news about the pipe. My only worry with boosting the power is the clutch, it has new plates and fewer weights but is still wimpy.....

 

The head is a good bit cheaper to do than the pipe. I pulled the stock end cap out & cut the spark arrestor out & put the tip back in. I also was running a pod filter with the jet to match. Like I said, wish I hadn't sold it.

 

Yeah the pipe is expensive. I did remove the little bullet shaped piece from the front of the spark arrester and re-installed it. The reeds, air cleaner mods and spark arrestor mods all helped the power. Thanks for your input "46"

 

Lot of potential. I like it

 

where did you get the wheels

 

That is really nice, I like the wheels. I have two of them myself, the one with no stickers is an '86 and has a chineese top end, I did some hillbilly porting with my dremel, air box mod and twin air filter and a 13t front sprocket, and no muffler or oil injection right now. It is a little rough looking, it was a mess when I bought it and I sanded the heck out of it and rattle canned it, but it is pretty stong. The other one is a '90, has airbox mod and spark arrestor out, runs fine but is no match for the other one. I moved the needle up one on both of them, it helped immensly as they are super rich stock. probably going to keep it closer to stock since it is really clean, the other one is my guinea pig. Going to do the head next...

 

Ive been keeping my eyes open for one of these. People either want crazy money or they are beat to nothing....and they still want crazy money haha

 

Yeah, the prices are stupid. I paid $225 for the first one, but it didn't have a seat, muffler and the top end was apart in a box. The second one was complete and just needed cleaned up, I had an add looking for parts on CL and the guy sold me the whole bike for $250. People on ebay want a fortune for most parts, except for the chineese top ends, but if you are persistent there are good deals and many of the PW parts are interchangeable. There is one on CL in Denver right now in about the same shape as my first one for $500...

 

$250 for the 90!, sweet deal. Yeah, most of these are beat or broken. Finding a good one is tough since they didn't sell alot of them. I've always said "it's not what it cost, but what it's worth". Knowing the value of anything you buy is key. If you have to pay more for a good one, you'll get your money back if you take care of it. As for the 10" front rim, it's for a Yamaha quad. It has the same hole spacing and is heavy duty. It needs some spacers between the hub and rim to get it centered between the forks but looks clean and works great. Also tubeless which is a plus. The rear rim is 8" instead of the stock 7". I found it at Chaparral with a centered 3 hole mounting flange. I had to custom cut out the mounting flange to the same dimensions as the stock hub to get it to fit. That was a pain but there is no other option I know of to get an aluminum rear wheel. Lots of tire options in 8" and it's also tubeless.

 

The wheels look awesome on there, and like you said, way more tire options. The deal I got on the '90 was great, the guy had it chained up in a parking garage in some condos in Denver, I didn't even try to talk him down. I paid almost that much for the other one in pieces. I do like having the beater, I want to try milling the head myself and get an FMF on it and see how it does, eventually I am going to use the original cylinder and put a Wiseco piston in it as well (.080" since it is really worn out), remove half of the balls in the clutch and go from there, I like to go to the dunes atv'ing and I like riding it from camp to camp.

 

you wouldn't have your old Yamaha part numbers for those wheels would ya? We have a stall with 6 fully restored bw80's. Have an annual big wheel race / party too. I would love to have a set of those wheels! Plus we are out of rear tire options, (we bought the last 3 rears the factory still had in stock last year). Thanks!

 

Just picked up a clean bw80 and ready to get this thing able to ride like a 125 with out boring...
Do we have a forum just to these little bw80s? I know the atc 70s are very popular.

 

They are basically a PW80 so engine mods would be the same. Forks are the same other than the clamps. They make heavy springs for them. I can't say enough good things about how well the Fastace reservoir shock works on this bike. The 550 lb spring for adults is perfect. The geometry of the swingarm allows the spring to work right. PWonly.com has some nice items (look under PW80) but they always seem to be out of stock. Do some searches on PW80's, there's info out there on upgrades....

 

Hey, 234Wheeler. Can I please get your contact information. Let me know how I can link with you. I want you to do the triple clamp mod for my BW80. You told me it would be $65 but I can't seem to fond a way to reach you. Please respond. Eric

 

Very cool bike! I always wanted a big BW, I think they made a 350 also, right? That would be a great candidate for one of my spare 490 motors!

But it's good to know that the 80 motor has enough power to be fun and pull around those big heavy wheels. Now I want one! That motor has a ton of potential. You could open up the exhaust port to 70% of bore and open up the transfers. If you have the tools, all it costs is time and a gasket set.

 

A few months ago I came very close to buying an 87' for $700. Been wondering if the bw is really worth the extra $$$ over the pw. I thought for that price I could easily pick up a pw80, mod it out and possibly have more fun on that.

 

I think a BW would be way more fun than a PW! I've ridden a PW80 and it sorta sucked. (sorry PW owners out there). And to be honest, I've never ridden a BW before, but I think I'd like it a lot more. Anyway, the resale value is there, so even if you spend more $$$, you can sell it for more $$$ too. I think they're getting more rare and more expensive. The value may even go up, unlike the PW's which are just getting beat to death haha.

 

Yes, they made a BW350. Used one's in good shape are expensive. Raising the exhaust port on the BW80 and milling the head give significant gains. The only weak link is the auto clutch. If the manual clutch from another model Yamaha 80 fits i'd sure like to know!

 

I just found one of these on Craigslist for $550 last week, but when I called the guy he said he actually had TWO of them for sale!!! I jumped in the truck and bought them both for $1100. Both fire right up on the first kick and run pretty good. Plans are to get a FMF pipe and little things here and there for now. I'd like to get some wheels and tires like you 234wheeler sometime though, those look really good! These things are a BLAST to ride.
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Yeah, the're fun. The front rim off the Yamaha quads is the same size (10X5). I had to knock out the studs in the front hub and use longer bolts, nuts, and spacers between the rim and hub to get the wheel centered between the forks but it looks good and is tubeless and lighter. Make a template of your stock rear wheel mounting flange and transfer that to a 8X6" wide rim with a centered mounting flange (0 offset). It's a pain to do but the only way I know to get aluminum wheels. It looks like the front rim for the Honda Odyessey FL250 made by Douglas (DWT) will be the "go to" rear wheel for the BW80. It's 8x6 wide with a centered mounting flange, no offset (3x3) with 3 mounting bolts. The center will still need to be modified to fit like the stock BW80 rim. Here's a photo of the modified rim....

 

Do we know what carb we can upgrade to? I was wondering if we could use a yz80 or yz85
Does anyone have a jetting guess going for mods or what stock jetting is? I know we aren't the same as the pw80s?
So porting the exhaust port on the head helps alo,t a fmf pipe for a pw80 helps, boring the top ******* style helps, boyseen power reeds, better air filter helps, what else?
i want to spank some klx 110's lol,

Also checked yamaha part numbers and we share the cdi box with the pw80 so we could use this
YAMAHA PW80 PW 80 RACING CDI CONTROL UNIT MODULE CD15