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Post by sparky1074 on Mar 16, 2015 12:33:36 GMT
Was wondering if anyone has any ideas or has come across this problem. The motor on my GSX1100 EX has been rebuilt from ground up. The work done included...rebore, new pistons, new rings, new cams, new APE valve guides and new valve stem seals. Only genuine Suzuki gaskets were used in the rebuild. The bike starts and runs perfect...BUT. On starting the engine there is quite a lot of Blue smoke and an oily smell. The Blue smoke quickly clears and turns to White smoke and then also clears. The bike does not smoke at all when warm and riding normally at any revs. This condition seems to be worse if I leave the bike for a few days. It seems oil is getting into the combustion chambers and then being burnt. What I cant understand is how can this be happening after the motor has been rebuilt by a very reputable engine builder. By the way this is the second time the top end has been rebuilt to try to cure the problem, genuine Suzuki gaskets and seals used both times. My local dealer says give it a thousand miles and see what its like then. Its not a massive problem because it runs and starts fine, but was wondering if anyone has any ideas or if someone has encountered a similar problem. Any ideas or advice really much appreciated.
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Post by pedda on Mar 16, 2015 16:42:03 GMT
How many miles did you do with it after the rebuild? Already done the brake-in? On re-done old faithful lumps I prefer the do-it-quick-and-ride-hard-method.  Warm it up to the last stud 'n' bolt and then give it a good hard ride. That worked for me. |
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Post by sparky1074 on Mar 16, 2015 16:49:41 GMT
Thanks for that, I will give it a good hard ride out on Wednesday, apparently the sun is going to make an appearance.
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Post by atshed on Mar 16, 2015 19:58:07 GMT
Did experience similar myself , what oil were you using on running engine in ? and what oil are u using now ? Thrashing out for new cams is ok but not always great for new pistons and rings.
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Post by sparky1074 on Mar 16, 2015 21:12:22 GMT
Being honest the re bore pistons and new rings was done by the previous owner, he didn't do that many miles as there is no discernible wear on the bores and the piston and rings are like new. I had new cams fitted as the originals journals were in bad shape. I use Motul 5100 semi synthetic. I may try another oil to see if there is any difference. What oil do you recommend, thanks again David.
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Post by neilw on Mar 16, 2015 21:14:33 GMT
Run it in for the first 500 miles with a good quality 10w50 motorcycle mineral oil , semi synthetic and synthetic are no use for the running in period
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Post by atshed on Mar 16, 2015 22:37:10 GMT
agree neilw - ran mine with rock oil gamma 10w40 mineral oil for first 600 with one change at 300 inc filter . then used a semi syn but found still smoking . changed back to rock mineral for further 600 miles. then back to semi syn.
now only get a very small amount on start up. hardly noticeable. I now use castrol power 1. But oil choice seems to be very much up in the air on forums worldwide.
the white smoke you mentioned is condensation already in exhaust boiling off.
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Post by sparky1074 on Mar 20, 2015 13:28:04 GMT
I know during the early days mineral oil was all there was, and thats what they all ran on. Will it be alright to run it on mineral oil then after using semi synthetic. If the bike seems to like it would it be ok to run it on mineral oil all the time. Thanks David.
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madmikeracing
Velociraptor
Posts: 28
Reg: Jun 11, 2014 13:07:59 GMT
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Post by madmikeracing on Mar 21, 2015 0:16:44 GMT
GSXR HM well it has only a side stand RIGHT???!!! If it sits on its side more oil pools onto the couple cylinders weeps down the Guide seals and poof on start up oil stink. I used to leave the Exhaust oil seals out of my Sprint engines for more lubricity, dont know if it mattered or not but got it down to 8.50s back in 1988 ,.seemed to run OK. and Im a fat Bastard 240 pounds. Mike
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Post by sparky1074 on Mar 21, 2015 11:35:22 GMT
Thanks for that Mike. My bike is a 1982 EX and does have a side stand...I thought the same myself about it being leant over for any period of time and oil pooling on that side. I always leave it on the centre stand when not in use. Thanks again David.
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Post by cregnybaa on Mar 21, 2015 12:23:43 GMT
I would say that its a valve guide/seal problem if it seems worse the longer you leave it, the longer you leave it gives more time for more oil to make its way down.
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madmikeracing
Velociraptor
Posts: 28
Reg: Jun 11, 2014 13:07:59 GMT
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Post by madmikeracing on Mar 21, 2015 17:43:38 GMT
Hey Sparky ,I've rebuilt engines with Guides and all clearances are Knob On, The side stand issue is just that, doesn't matter if clearances are good oil will eventually through capillary action weep into the combustion chamber, If it doesn't there is not enough clearance, even .001 clearance is .oo1 clearance and yes oil will weep into this clearance. So don't worry be happy start er up warm up and enjoy. Happy Riding Mike
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Post by sparky1074 on Mar 22, 2015 21:26:59 GMT
You know what Mike I was thinking exactly the same thing. The bike starts and runs better than its ever done, so as you say I'm not gonna let it bug me, I am just gonna carry on loving and pampering the old girl. I got out my folder of receipts out tonight to have a look, and it scared the sh-t out of me...the quest for perfection aint cheap. Thanks again David.
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Post by slim on Mar 22, 2015 23:57:15 GMT
If the bike seems to like it would it be ok to run it on mineral oil all the time. Thanks David. I have run all my gs's, gsx's on mineral oil over the last 35 years & never had a problem, its what they were designed to run on & I cant see any point in changing now just use good quality stuff & change regularly |
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Post by sparky1074 on Mar 23, 2015 13:21:05 GMT
I have ordered some Rock oil 10/40 Gamma and a new filter so I will give it a try. Thanks for the advice David.
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