Cr80R engine rebuiling...

[CR80Ride]

Hey, just bought a 1996 CR80R a couple weeks ago. Ive rode it probably 20 times and it was running awesome. So a few days ago I take it out and it seizes rock hard. I was too pissed to work on it so I put it away. Next day I come out and it freed up but the motor's a mess. Dealer quoted 750 bucks....no way could it be that much...what are some other options? Bore it out and throw in some new crank bearings? Thanks

 

[Cody305]

and it freed up but the motor's a mess. Dealer quoted 750 bucks....no way could it be that much...what are some other options? Bore it out and throw in some new crank bearings? Thanks

Not a bad price considering what has to be done to it.
Is the cylinder in need of a bore? US Chrome $219.00

New piston kit $75.00

Crank, bearings, gaskets, seals $125-$200

Total $500 + $250 labor. To split the cases and do a complete overhall, I'd say they are fairly decent about their prices.

Now on the other hand. If you can split the cases yourself and do the work, you will save some money.
Does the cylinder nees to be bored? or maybe just honed?
Stock piston kits are fairly cheap.

 

[CR80Ride]

A buddy is doing the work. Im thinking about going with Eric Gorrs 100cc kit. Think it needs a new crank? thanks

 

[Patman]

If you don't know when the crank assy was lat replaced it would be money well spent to just get a Hot Rod's kit and be sure you are not going to experience another problem after you button it all up. Eric's super mini engine has been some of the best money we spend on dirt bikes to date. Made the CR85 a MUCH better bike for my son.

 

[nsxxtreme]

Eric's super mini engine has been some of the best money we spend on dirt bikes to date. Made the CR85 a MUCH better bike for my son.

Can you explain why?

My girlfriend rides a 98 CR80 she does fine but stalls it every once in a while. I would like to get some more bottom end for it. Already have a flywheel weight. She is vertically challenged so a different bike is not really a possability. Also what a lot of people forget is the weight of the bike she handles this one just fine.

 

[Patman]

Better power across the board and Eric's attention to detail in building it from the crank up. There is no way a CR80/85 will ever be a bottom end torque monster but the combination of the EG engine and Steahly flywheel weight make for a bike that stalls AT LOT less in tight situations and pulls sooner off the bottom.

 

[mideastrider]

(if they contact Okie about a sponsorship deal they can advertise - Patman)

 

[mideastrider]

Whatever

 

[nsxxtreme]

Better power across the board and Eric's attention to detail in building it from the crank up. There is no way a CR80/85 will ever be a bottom end torque monster but the combination of the EG engine and Steahly flywheel weight make for a bike that stalls AT LOT less in tight situations and pulls sooner off the bottom.

Thank you thats what I was hoping to hear. Obviously I am realistic about the power output of a CR80. She just needs a little more bottom end, not much just a little, for the up hill situations. What would be ideal is a CR125 motor in a CR80 frame.

Hopefully the bike still idles fine? Doesn't run like a basket case? How many hours do you get on the piston and rings? Hopefully more then the 10hrs he mentions on the 144 kits.

 

[Patman]

The bike idles fine and responds to throttle input crisply. We just ride for fun so the top end should last a bit more than on a race bike, haven't needed to replace rings yet. Eric did send along a bigger aftermarket radiator from Fluidyne so that may be a consideration.

 

[Patman]

Whatever

 

[jason33]

if its jetted right and not too lean it should last
for more power try a smaller front sprocket
what does it need a total rebuild or topend??