Rebuilding 2kr FZR engine

yep, seen that and emailed to see if can get head gasket only.

 

Won't you need abase gasket as well ?


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already got a base gasket on way.

 

for your parts contact frankston yamaha before you buy off ebay. just got genuine head gasket with postage for 36 bucks.

 

that's a nice price

 

This is worth considering also when you have the crank removed

http://www.fzr250.com/viewtopic.php?f=21&t=3345

from

http://www.fzrarchives.com/fzr400/FZR400 Frequently Asked Questions.html#Where are the oil restrictors, and what's this mod I hear about?

 

interesting.

 

I was considering pulling my engine down to implement this fix but didn't find reasonably priced parts to refresh the rest of the engine till after I'd refitted it.

It looks to be an easy job to do

 

have seen car cranks fitted with plugs to facilitate machining.if not broken why do? more like crud caught in oilways and crank not cleaned properly.the plug should be staked and from the article it appears the plug comes loose.same effect would apply if journal out of round or excessive clearance.

 

engine problem is number 2 cylinder. much oil. other ports were dry.had to remove fairings, and exhaust to change oil filter hf145.cannot imagine too many being changed.

 

It was more of a preventative measure because of a known point of failure, but I decided that my engine is well maintained with good compression etc so left it be.

 

it's a true PITA but gladly the filters are cheap

 

parts from china arrived today and look to be good quality.if i rebuild another motor will check with frankston yamaha first.

 

That's quick delivery, anything from China usually takes several weeks to arrive for me...

I'm interested to see a pic of cylinders with the head removed if you're up to documenting the process

Are you going to ball hone the cylinders?

 

when i strip the motor down i will decide. my engine hones will not fit in these cylinders which are roughly 40 mmm. might use some 1000 wet and dry and wrap around toilet roll and rotate and move up and down at same time.would like a small ball hone but doubt if expense to buy is justified. rings are very narrow and oil rings are 3 piece, top ring and oil rings chrome faced and black 2nd compression ring.bearings supplied are white metal and well made. valve stem seals are tiny but push on to valve guides. stem size looks roughly 2 mm.

 

if you used 320 - 400 to remove the mechanical polishing (it's not actually glazing - technically) followed by 1000 you may be able to replicate plateau honing which I've read good things about

 

motorbaby 2012 on ebay.com has head and base gasket for usa 25.90. have ordered a set to compare to genuine yamaha.

 

I've got a crazy idea in my head - a big bore with the same stroke to get into the ~1.5:1 bore to stroke ratio or larger

Any chance of taking measurements once you have the cylinder head removed of the space between cylinders.

 

try findapart.com.au. Wreckers ring you up if they have it in stock.

 

space between cylinders is not much.certain i have a spare set of barrells somewhere so will check them. ordered a spare head gasket set from china.