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  #1  
Old 12th September 2017, 10:47 PM
westbury07 westbury07 is offline
Wobbling Fledgling
 
Biker.ie Member No. 17279 from West Dublin (leixlip)
9 posts since Jul 2009
Motorbike: yamaha R1 2000
Default R1 Engine Types 1998-2001

Ive just bought an R1 and the engine is low on power and Compression 130psi
its a 2001 UK bike - the Engine block is stamped 5PW00 Y-2 and the Head stamped 4XV00 - does this mean they are mixed years ? if I source a replacement is there anything i should look for to be sure its suited.....?
so I think 4XV00 is the older models and 5PW00 is the newer 200-2001 ?
Is it worth replacing just the piston rings (says 23kmiles) but suspect more..
any engines for sale ?

Cheers

Paul
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  #2  
Old 13th September 2017, 12:28 AM
chopper's Avatar
chopper chopper is offline
spanner spinner
 
Biker.ie Member No. 1841 from meath
53,416 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Modifications: mud
Default Re: R1 Engine Types 1998-2001

Did ya try oil in the bores to see if compression comes up ? Is that a hot or cold test ?have the valve clearance been checked ? Rings should not be due till after 50000 miles (or more) but they did tend to oval the bores .
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  #3  
Old 13th September 2017, 09:11 PM
soccersmyth's Avatar
soccersmyth soccersmyth is offline
Supporter
 
Biker.ie Member No. 23867 from Lios na Scéithe,
1,246 posts since Sep 2010
Motorbike: R1
Modifications: Debit card
Default Re: R1 Engine Types 1998-2001

Sound like you've got a motor that was rebuilt using the 5PW 02-03 Fi R1 bottom end.
As the bottom ends from 98-03 are the same, that's not a issue at all using one or another.

It just means it's been apart before.

First question is, are you confident enough with the spanners to do the work yourself as you wouldn't be long getting into the price of an engine if you were going to have to pay someone to do it for you.
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  #4  
Old 13th September 2017, 10:57 PM
westbury07 westbury07 is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 17279 from West Dublin (leixlip)
9 posts since Jul 2009
Motorbike: yamaha R1 2000
Default Re: R1 Engine Types 1998-2001

Originally Posted by chopper
Did ya try oil in the bores to see if compression comes up ? Is that a hot or cold test ?have the valve clearance been checked ? Rings should not be due till after 50000 miles (or more) but they did tend to oval the bores .
Dry test but I think it should be higher anyway . Valve clearance Pk ..I need to dig deeper .... cheers
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  #5  
Old 13th September 2017, 10:58 PM
westbury07 westbury07 is offline
Wobbling Fledgling
Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 17279 from West Dublin (leixlip)
9 posts since Jul 2009
Motorbike: yamaha R1 2000
Default Re: R1 Engine Types 1998-2001

Originally Posted by soccersmyth
Sound like you've got a motor that was rebuilt using the 5PW 02-03 Fi R1 bottom end.
As the bottom ends from 98-03 are the same, that's not a issue at all using one or another.

It just means it's been apart before.

First question is, are you confident enough with the spanners to do the work yourself as you wouldn't be long getting into the price of an engine if you were going to have to pay someone to do it for you.
Thanks for reply ! Yeah gonna price it all up now .. cheers
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  #6  
Old 14th September 2017, 03:39 PM
chopper's Avatar
chopper chopper is offline
spanner spinner
 
Biker.ie Member No. 1841 from meath
53,416 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Modifications: mud
Default Re: R1 Engine Types 1998-2001

Originally Posted by westbury07
Dry test but I think it should be higher anyway . Valve clearance Pk ..I need to dig deeper .... cheers
Yes its low readings for a warm engine alright. 180 is low iirc . The oil in bores is to figure if its rings or valves . Id say youll be looking to fix that motor as good ones are hard to find
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