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northmanuk
Ear-Plug Cleaner
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Joined: 13 Nov 2018
Posts: 36
Location: south wales (im English)
PostPosted: Thu Nov 15, 2018 2:11 pm    Post subject: cracked liner Reply with quote

saw a cracked liner on a thunder ace i stripped for someone so i guess it does
happen but you would have some indication of this in other ways it sounds like the pilot jet in centre block i worked on a ru which was showing similar faults
it would run on choke but if you closed it nothing. these little jets are buggers to get out you may be best just soaking hole lot in vinegar
i agree compression test will be first step tyo see if any pot is low best of luck
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YAMAEXUP
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Joined: 09 Dec 2009
Posts: 857
Location: NW Kent
PostPosted: Tue Nov 27, 2018 6:04 pm    Post subject: Reply with quote

I've not heard of cracked liners on FZRs but i've seen & experienced them on R model 600s & 1000s.

But the fault sounds much more like the 'O' rings between the cylinder head & the inlet manifolds part #9 on the fiche

https://www.cmsnl.com/yamaha-fzr1000-1990-3lg2-europe-203gm-300e1_model37721/partslist/0011.html#.W_2GM7iaLTQ

If any of these are split it would mirror the problems the OP is having. I've seen it many times.
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northmanuk
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Joined: 13 Nov 2018
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Location: south wales (im English)
PostPosted: Tue Nov 27, 2018 6:08 pm    Post subject: cracks Reply with quote

the engine i saw and dismantled had just been raced to death i have dismantled quite a few exups and aces which racing has killed
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bikes 1993exup, 1988 zx10b1, 1989 zx10b3, 1981Gsx1100,ex,
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YAMAEXUP
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Location: NW Kent
PostPosted: Tue Nov 27, 2018 6:09 pm    Post subject: Reply with quote

Fowlers of Bristol also have them in stock

https://www.fowlersparts.co.uk/parts/4071759/fzr1000-3gm4-1990-999-b/intake
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