Can a top end rebuild be done with the engine still mounted in the bike, or does it need to come out?

Edit: Let me rephrase, is it worth the hassle to remove the engine from the bike to do a top end rebuild? Or is it easier to just leave it in there and work on it?
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Jerry Lai
NSR250 [MC21SP]

Leave it in the frame. You can do everything without removing it. You can even change the crankshaft if you can't be bothered to pull the engine out.

Some of the base nuts of the top cylinder just looks a bit hard to reach.
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Jerry Lai
NSR250 [MC21SP]

That's where a special tool comes in handy. Not striclty necessary though as you can still sneak in there.

Leave the motor in...no need to take it out and create a bigger job than it should be. Its a bit trickey to get the top cylinder bolts out without the "special tool" bit with some tinkering and a variety of tools, you should be able to get it out. Next time I do a topend on the 28, I'll have the "special tool"
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1994 NSR250SE

Matt@TYGA wrote:
Leave it in the frame. You can do everything without removing it. You can even change the crankshaft if you can't be bothered to pull the engine out.

You callin' me a lazy c**t?!
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Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

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Where might I find this "special tool" you speak of?
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Jerry Lai
NSR250 [MC21SP]

Yep Andy, I am calling you a lazy something

Me too, 'cos I've done it more than a few times.

Well I didn't have a bench handy at the time!

As far as I know, the motor's still going strong too, eh rc46?!
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Andy.
NSR-WORLD.COM

Please keep all responses to Forum posts on the Forum so that others may benefit.

Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.

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Well, I am a lazy c@nt, so I really want this "special tool"
Now cough up the information for God's sake
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Jerry Lai
NSR250 [MC21SP]

Yeah, What's the word on the Jha tool?

Jezza...keep the engine in. My rebuild turned into...

engine removal
hours of cleaning
new throttle,rc valve & clutch cables
new engine mounts
new water hoses
HRC jet kit
MC28 front end(complete)
MC28 rearshock
weeks waiting for parts from Japan.

Don't get me wrong, It should be sweet when it's back together & running, I hope. It won't make any magazine covers like some others but it's mine.

F@#kin awesome bike Frank. Just got my copy today.

SPENGILLY wrote:Yeah, What's the word on the Jha tool?

Is that what you guys are on about

But from memory it still looks kind of cramped to get tools to the front base nuts of the top cylinder, but then again my memory is not that great

Got to get myself one of them JHA tools then.
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Jerry Lai
NSR250 [MC21SP]

You callin' me a lazy

Andy, I thought you were keeping the standard of grammar on this site to a high level

And while we are at it: fecking is not an english word ( is it that other F word misspelled ?
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom

pbekkerh wrote:And while we are at it: fecking is not an english word

you are right its an Irish word LOL
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold

pbekkerh wrote:And while we are at it: fecking is not an english word

Yes it is, it's in the Oxford English Dictionary and is therefore an English word.


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Please do not PM me technical questions, if you can't find it on the Forum start a thread