honda CR80 questions
 

alright guys, I got some questins here.

I'm getting a 94 Honda CR80 dirtbike, and I'm wanting to know, what years will interchange in terms of parts? or are they all pretty much the same?

I'm told it needs a little tranmision work, so I'm just going to replace the tranny and rebuild the old one when I'm not busy and have money pretty much.

am I truly the only person on here that actually owns a dedicated dirt bike?

Go here Then you can cross reference the parts with other years.

Definitely not.

We own dirt bikes but I do not know the answer to your question - sorry.

No.. But technically you own a minibike.

how the hell do you figure this? the CR80 isnt by any means physically compact machine at all. the XR80 is a minibike technically I think. this is more of the 30" seat height and lotta suspension travel shit.

http://img185.imageshack.us/i/cr80sale002eb1.jpg/

This generation bike right? Its barely the headlight height of a truck. That's a mini bike in my book.

And these guys...

http://ezinearticles.com/?Types-Of-Mini-Bikes&id=404939


But the easiest test you can take is trying to clear a double with a full-size adult on the vehicle that should be easily done an a 125 2-stroke or 250 4-stroke bike. There's some AMA classification ruling as well, but I don't feel like digging up.

yeah, that'd be what I have, but in all fairness I define a minibike as being something with like wheelbarrow tires on it, considering that, this bike is pretty much perfectly sized for me.

I wouldn't consider a CR80 a "mini". Hell, the Big Wheel version isn't much smaller than a 125 MXer.

50's and 65's are mini's. 80's are in-betweeners.

They are designed for kids. I'd think anyone over 150lbs would want a bigger bike.

That said, don't underestimate it. Once on the pipe, that "kids bike" won't hesitate to put you on your ass. :lol:

I have no idea on parts interchangeability. :idk:

IIRC, Bob's about 130lbs soaking wet... perfect for him.

Ahh here it is, MiniMotoSX.

http://www.minimotosx.com/adultclasses.htm

They rank it by wheel size past the 50cc's.

ALL CLASSES ARE “4-STROKES BIKES, AIR COOLED ONLY”

The CR is a liquid-cooled two stroke.

It wasn't built as a play bike a pit bike or a toy.

It is as much an MX bike as your 250 or your 450.

Ya good luck with that. I'll stick both of mine when going 30+ft in the air.

from what I'm seeing it looks like parts are pretty interchangeable, so I'm probably just gonna buy a trans out of a more recent one, along with a piston, some new bearings for the crank and wheels, and go to town building a lunatic bike.

I know a little about ridin 2 strokes. OSP you're right, Im actually closer to 110 soakin wet though, so this bike is absolutely PERFECT size for me. once you get into the powerband, 2 strokes are FUN to play with. I LOVE that rush and the way they smell in the morning.

Bob,

got three boys riding here myself. We have 02 CR80RB, 03 CR85RB, and an 04 CR85RB converted to a CR101RB (Supermini)

These are really reliable bike, however i will tell you that if you are going down to the tranny level you might as well plan on a crank kit too. Wiseco has some killer prices on their kits and better than the OEM parts.

Cases can be a little hard to seperate, but do some google searches and you should find some good tips on how to spilt the cases.

well I'm doing a total rebuild of the motor, since when I got it the engine was in pieces, and I'm not digging how much play is in one of the crank bearings. the crank itself is ok, but the bearings, are toast. at least everything is nice and clean.

how much more power does the 101 kit give? and is it reliable/affordable? I have no worries it'll be a good bike, hey its a HONDA. these things are tough as frikkin nails.

We send our Supermini stuff to Eric Gorr for machine work.

http://www.eric-gorr.com/porting.html

Basically the cylinder is punched out to 52MM (stock is 47.5mm i think) and the ported like a monster to flow way better. This will make it a 101cc. To get 105cc or higher you use same piston, but put a stroker crank in.

101cc is pretty reliable and with the ported cylinder she rips. I should know, because i can get on the stock refreshed CR85 and then on the CR101 and there is no comparison.

You have to watch the temp on the 101cc and keep her moving or she will overheat. We run FactoryEffex temp gauge stickers ontop of the radiator and the side of the cylinder to keep and eye on temp while son is on the starting line.

We also bought an aftermarket overflow bottle for the radiator to catch coolant if she gets hot so it can suck it back into the radiator as it cools down with air movement thru radiator.

I don't care if the crank looks okay, if the bike is old replace the crank/rod combo and main bearing and seals.

If i recall the crank kit comes with the bottm end gasket kit, seals, bearing , crank, rod, and upper rod bearing for less than $170

Check out wiseco stie http://wiseco.com/ProductDetail.aspx...994&AppID=5986

Kit includes:

Crankshaft
B1012 - TOP END BEARING 14 X 18 X 16.2mm
B1045 - CRANK PIN BEARING - 20 X 26 X 13.8mm
B5009 - MAIN BEARING 22 X 56 X 16MM
W5763 - THRUST WASHERS(2) 20MM ID X 1MM
W5789 - CRANK PIN - HOLLOW - 20MM X 45MM
WB1012 - Bottom End Gasket Kit- '86-05 CR80/85

You can get the crank kit off ebay with the bearings and gasket kit for around $137 to your door.

http://motors.shop.ebay.com/i.html?_...&_sop=15&_sc=1

Seriously, if you have not bought any parts yet, this is the way to go. By the time you buy bearing, seals and gasket kit you are going to be half the cost of this kit, why not take care of the crank now and do it right.

It's what i did and will do on the CR80 and CR85 when they are ready to be refreashed. Even if you don't do the Eric Gorr 101 route, you should still replace the bottom end. seperating the cases is the hardest part. The bearing can be tricky to get our of the cases, use heat and freeze the bearing to put them back in.

thanks. I'm probably putting this bike on the back burner then until I get some cash flow so I can build it right. no sense doin the job halfass and screwin up right?

I think you're confusing a motocross bike with a dirtbike. Dirtbikes are motorcycles you ride in the dirt. Motocross, enduro, off-road, etc are sub classes of dirtbikes.

Kind of like motards, sportbikes, cruisers, standards etc are sub classes of street bikes.

I have to somewhat agree with this in that even my sons CR85RB punched out to 101cc is called a Supermini (hence the words mini).

However the statement about jumping a double with an adult on it, you would have to classify adult. My son is almost 17 weighs 130 and at our local track jumps the Supermini over an up hill triple with the throttle pinned. The distance jumped is 75 feet.

On that the fast kids on the KTM 50's are jumping the same jump.

The CR85 makes a great woods bike or MX bike as is out of the crate. Just depends on the riders skill and weight. My son is on the upper limit for the bikes suspension and it has been modified for his weight. if you are wondering or not he also races his CRF250R, but is faster on the CR101.

I mis-spoke. There are generally three classes. Street, offroad and dual purpose. We've always called offroad bikes dirtbikes. It just made sense, since you'd be riding in dirt.