Vintage Dirt Bike Q & A

Hi guys. I'm having probs with my 1982 cr. It has a leak somewhere and I can't find it.

I'm getting water in the bottom end. I have put a new complete set of seals in it and it still does it.


ANY IDEAS PLEASE

Head or base gasket? Water pump seal? New seals but worn bearings allowing shaft to move and let water past anyway?

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Michael Stiles
1979 Honda CR250R Elsinore | 2006 Husqvarna SM510R | 2007 Service Honda CR500R-AF

The seals i mentioned are a full set of seals in the water pump the head gasket is new as well i havent as yet checked the base gasket

the bearings are all good in the pump and i have inspected the shaft for the impellor and its near mint


bloody thing has me baffled

porosity in the case from corrosion of the magnesium from antifreeze from 20 years of age.81 had aluminum cover-find one and ill bet itll be ok-or jb weld the cover-it worked for me in a pinch

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1979 Honda CR125RZ
1982 Honda CR125R
1979 Yamaha YZ100
2003 Kawasaki KX250

yup i even did the ally case thing and the sucker still leaks

so far i have replaced the seals twice to no avail the case got replaced with the ally one
i put a new impellor and shaft into it
new head gasket


god what 20 odd years of not haveing the bike has done

this is the bike i orignally raced in tasmania and sold when i moved to west australia i found it spent bucket loads on it and it leaks
you can imagine the frustration
and finding they dont race EVO class here in west aus

Hello,

If you are actually getting water mixed in with transmission fluid (oil), than the only way this could be occurring is through the water pump seal and or clutch cover (the head gasket is irrelevant). To find out where it’s leaking (or better yet when it stops leaking), take the clutch cover off while leaving the water pump and the in-let/out-let hoses connected to the housing/pump cover. Plug the out-let hose (the one closest to the rear of the bike) with a small freeze plug, bolt or something so that it is sealed. Take the in-let hose and insert a valve stem from a car or truck wheel into it; you’ll have to take another smaller piece of hose or semi-hard tubing which fits sung over the valve stem and inside the in-let hose in a way that the in-let hose can be clamp air-tight around the valve stem (sealing the valve stem in - without closing the air passage). Now you can take an air pump (don't use a compressor!) and fill the system with air. Submerge the cover in some type of liquid and watch for the bubbles. Hopefully, with a little troubleshooting and repair, this will help you get back to a water-free transmission.

Be sure that you are using the correct impeller and mechanical seal; their part numbers are 19215-KA4-000 and 19217-657-003 (or 013/023) respectively.

Good luck,
Robert D. Hawes Jr.
Mesa, Arizona

Hiya guys i now have the mototr and the bike pulled down so i will do a pressure test on it and find out whats going on the pump appears to hold water but i still have it in the bottom end so im thinking there might be water getting in from somewhere in the cylinder or head area so ill test it and let everyone now the out come

Hiya Guys

i have since rectified the probs i had with my water bucket
It after lots of searching turns out that the seals that were in it for wich i followed were fitted backwards in the water pump
Lucky enough one of our local dealers Rick Gill Honda had a seal a whole five bucks and its now in and not leaking after three weeks of haveing water left in the system