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Starting up old engines.

Started by roverfj1200, July 01, 2019, 03:34:02 AM

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roverfj1200

I recently fitted a second hand low mileage engine to my bike. This engine has sat un-started for many years. I first started the engine in the old bike and cycled it through a few warm up cool down cycles. Compression was down on 3 cylinders but was building when turned over with no plugs or carbs fitted. The engine blow some smoke at first but become less as I cycled it hot and cold. I then removed it and fitted it to the next bike and on start up blow a steady cloud of blue smoke for a few minutes. I allow it sometime to cool and started it again and there was no smoke to be seen. A test ride of 5 miles or so and the bike ran well with no sign of smoke. After 24 hours I started the engine and ran it for 2 to 3 minutes as it filled the shed with blue smoke. Shut down and allowed to stand for 5 minutes or so and on restart there was no smoke issue at all. This is not like valve seals where a puff of smoke is emitted on start up, the smoke continues for the whole warm up and only stops after a rest.

I feel this will fix itself with a few good rides but would be interested in what other peoples thoughts are as I have never seen this heavy smoking and then non before.

1988 FJ1200
1991 FJ1200

Richard.

Dieselman7.3

Worn rings or valves? Could be closing the tolerance one warmed up and stops smoking.  Just be my guess
Current:
85 fj1100
89 fj1200 - was for parts now a new project
16 Versys 650 - for off payment riding
Past:
86 fj1200
05 ex500
78 Ltd750

Motofun

If it smokes after sitting all night but not when it's warmed up I would think that's an indication of the valve stem seals leaking.
'69 Honda Trail 90
'75 Honda CB400F
'85 Yamaha RZ350
'85 Yamaha FJ1100
'89 Yamaha FJ1200
'09 Yamaha 125 Zuma
'09 Kawasaki KZ110 (grand kids)
'13 Suzuki GSXR 750 (track)
'14 Yamaha FZ-09
'18 Suzuki GSXR 1000R (track)
'23 Yamaha Tenere 7
SOLD: CBX,RZ500,Ninja 650,CB400F,V45 Sabre,CB700SC,R1

red

Rover,

Yamaha makes a dedicated additive called Ring-Free, which may or may not help.  Directions are on the container.
.
Cheers,
Red

P.S. Life is too short, and health is too valuable, to ride on cheap parade-duty tires.

Pat Conlon

I assume you did all the basics, checked the valve clearances, cleaned & balanced the carbs, etc, etc...

Don't fuss around, ride it....then ride it some more. No coddling. Ride the piss out of it.

Reevaluate after your 2nd oil change.

1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3