Smoking GSXR1000 on deceleration [Archive] - Suzuki GSX-R Motorcycle Forums Gixxer.com

: Smoking GSXR1000 on deceleration


bmgracing
09-22-2003, 11:40 AM
Just wanted to post and see what you guys think. A little history on the bike. I purchased the bike from a guy out East who had Blackman's shop build the motor. When I got the bike all it had on it was dyno time. Pretty mild build, carillo rods, yosh cams, head decked and ported by KWS. I only rode the bike for 20 minutes at a trackday, had a buddy take it out and he threw it down the track on the out lap. So afterwards, when we were taking the airbox off, we managed to drop some pebbles down the throttle bodies (many lessons learned that day). To be on the safe side I had a local guy pull the motor and take the head off to clean it out. All his comments were was how nice a job KWS did and that there was no scoring on the cylinder walls . . . everything looked good. He also tuned the bike with a TEKA unit and wasn't completely thrilled with that because it doesn't tune for RPMs . . . just throttle position . . . so he thought it was dumping in way too much fuel on deceleration.

Took it to another track day and when I came in the course control guy said my bike was smoking really bad going into the corners. I assumed it was just unspent fuel. Well, went out for another 20 minutes and came back in . . . checked the oil and it had gone through a whole site glass full (1/2 liter) of oil in 2 20 minute sessions. Pulled the airbox and it didn't have any oil in it. So what in the hell should I do now?

I've had people tell me just to ride it and monitor the oil level. This past weekend I had a buddy ride it down the street so I could see how much it was smoking . . . it's bad . . . I would be getting blackflagged for sure. Other people I have talked to feel it's a bad exhaust valve guide seal. Any other ideas? I'm in the middle of pulling the motor right now and will probably send the head back to KWS. Thanks in advance for any input.

P B
09-22-2003, 01:56 PM
So it started smoking after the guy pulled the head to clean out the debris?

bmgracing
09-22-2003, 03:12 PM
I don't know when it started smoking. When I got the bike we took it on some farm roads and nobody noticed anything. I only rode it for a 20 minute trackday session and nobody noticed anything . . . it was wrecked after that. As much as it is smoking, I find it hard to believe that Blackman's would break it in on the dyno and let it go out the door like that.

So to answer your question, I'm not positive when it started smoking but it was noticed only after the head came off of it after it was wrecked.

Cestode
09-22-2003, 10:35 PM
Were you the Primed skins out at AMP? blue tank.. On 13-14???????

WebCrush
09-22-2003, 10:38 PM
sounds fishy. If you can't tell if it started happening before or after the head-pull, I'd call Kevin at KWS and bring it up. He's a stand up guy.

Either that or STOP decelerating. http://www.gixxer.com/forums/images/graemlins/grin.gif

bmgracing
09-23-2003, 08:17 AM
I was out at AMP in the morning on the 13th . . . I only went out for 2 sessions. My bike is primered, but with a desert storm looking tank, not blue. The blue you were seeing was probably from all the damn smoke!

PDG, I haven't spoken with KWS yet. Pretty sure I'll be sending it back to them. I really don't have any recourse because I wasn't the one who had the motor built in the first place. At this point, the motor only has dyno time and about 60 minutes of track time. Am happy to hear Kevin is a stand up guy though . . . that'll help out!

It's a 1000, not a 122 hp 600 . . . I have to decelerate at some point!

Cestode
09-23-2003, 10:19 AM
Yeah I was working corner 5 with Leanangle. He was out there with you, Black 750. Seems you were way low on power coming out of the corners & going down the straights. You would puff a little while getting on the gas then it would clear up. Upon decel it would just shit smoke out like no tomorrow. Can't remember if Lean had any fluid on his bike or visor from following you in a session.

Hope that helps a little

Lizard 1
09-26-2003, 07:10 AM
First thing - I am not saying the guy you bought it from was lying, but almost anyone will say the bike they are selling has low hours. Just because it had metal taken off and a few parts thrown in doesn't mean it was gone through completely. Too many times, guys take just the heads off, get the thing shaved and do some fancy cams and a valve job, but overlook the real areas that need attention - the bottm end.

Sounds to me that he had the head whacked but didn't do anything to the cases - shame - that's where good power is... Anyway, it very well could be a ring issue. Also, if it truly did only have dyno time, how well do you know the guy you bought it from? Did he break it in right and carefully?

Just questions, man. The bike probably, like most that do the mods you stated, never had a true Supersport tune and build done to it. So, the bottom end is probably stock and as old as the bike is with all that racing on it or street miles.

Take the winter and do a COMPLETE tear down. Loosen up the bottom end bearings and put new rings in. Take the time and you'll find it will turn out ok. Too many guys who buy race bikes with performance stuff done to them don't realize maintanace is key. Our motors need torn down to the crank every season. Any competitive racer does the same. When you do mods, shit wears out and you loose optimum performance. Sure, it will still run better than stock, but if you dive into it deep, expect to perform regular service. On a true Superstock (or, a Superbike) motor, tearing down to the crank at the end of a season is normal proceedure. Otherwise, all those mods you have aren't worth the box they came in...

bmgracing
09-26-2003, 09:03 AM
Lizard1, thanks for the reply. As for time on the motor, it really did have only dyno time. The primary reason I bought this bike is because he was willing to trade for my 996 racebike. Before the deal was completed, I spoke with the engine builder, Bill Himmalsbach, and the bike was still at his shop at that point, that's how I know it doesn't have any time on it. I don't think anything was done to the crank, but it has carillo rods in it so the bottom end was not neglected completely. Further, the bike was bought as a racebike originally and didn't have any miles on it really (that's what owner said). The head was done by KWS . . . so very, very reputable people have worked on the bike.

I'm in the process of pulling the motor right now. It's obvious what cylinder is the problem cylinder . . . # 2. Looking into the head on the exhaust side, oil is basically all over the exhaust port. Looking into the head on the intake side, it appears that oil is on the valves there too . . . I'm hoping that's not the case because I was really hoping it was going to be an exhaust valve guide seal and not the rings. The oil on the intake side might be coming from the breather tube though. Any ideas?

I went into this knowing that a built motor was going to be more maintenance work than a stock motor. It's unfortunate that I had no time on the bike before it was wrecked . . . so I would at least know if it was smoking when I got the bike. If that was the case, I would have just sent it back to Blackman's shop and asked them politely to fix it.

So do you have suggestions on anything else I should do to the motor while it is apart besides loosening the bottom end bearings? Anyway, I'll let you know what it turns out to be.

somejeffguy
09-26-2003, 09:42 AM
do a leakdown test - if anything's getting past the rings, you'll know.