2001 Busa Burning oil

[1620jz]

I have a 2001 Busa with approx 12,000 miles and about a year ago I was putting out 167-168 hp. and less than a year later it dropped to 152-153. My mechanic says that that shouldn't be and somethings wrong. Compression testing showed mid 190's and Leakdown was 3%.

He says that is within manufacture specs. But when its on dyno it smells of burning oil and does puff black smoke when you get hard on throttle.

To answer some questions  it's the same dyno each time and is a newer dynojet model.

He wants me to tear down engine as he thinks piston may be out of round or rings could have lined up??? But  if he doesn't find anything warranty won't p/u the tab so i'm asking for some input from anyo0ne who may have heard of a problem like this or has experienced this type of problem.

Thanks for any help !!!

 

 

[jwcfbd]

I have a 2000 that was acting up this summer. It would load up on me when I was stuck in traffic and start smoking really badly. When I got it to the shop they told my it was running very rich. They remapped it and it feels like it has a lot more power but I don't know what the numbers are. I also haven't had it stuck in traffic so I don't know it that was all it needed. You might want to have them do a check on the fuel/air mixture and see if it is running right.

 

[1620jz]

Thanks JWCFBD, Appreciate the input. When he ran it on the dyno he checked the Mapping and everything was good. It has PCII and is custom mapped by him. This doesn't seem to be a load up of fuel, but its actually burning alittle oil.

Thanks though and maybe this will help spark some more ideas.

Thaks Jeff

 

[MET]

Thanks JWCFBD,  Appreciate the input. When he ran it on the dyno he checked the Mapping and everything was good. It has PCII and is custom mapped by him.  This doesn't seem to be a load up of fuel, but its actually burning alittle oil.

Thanks though and maybe this will help spark some more ideas.

Thaks Jeff

If you are getting real black smoke it does not sound like it is burning oil. You would be getting more blue grey smoke. If you have a pc on it take the low and the mid down a notch or 2 and see if it changes anything.

 

[Noltez]

Sounds like your mechanic is cool. You'd need to talk to him first... even if he just says the rings lined up so warranty will cover it. Maybe some cash in his pocket... I dunno. But if it's really burning oil than there WILL BE residue on the plugs. You sure your bike doesn't just need a good tune up?

Good luck!

 

[1620jz]

Thanks Everyone, Keep the ideas coming.. I do have a PC and I will let him know since he is the one that custom mapped it.

I suppose your also right. I haven't replaced plugs or any other tune-up items on the bike. I'll talk to him some more regarding that.

As for the smoke. It is black and in the dyno room makes your eyes water. But according to air/fuel monitor fuel mixture is good. but I'll bring it up to him.

While the bikes apart I might as well take care of all the Valve adjustment,plugs, etc. to rule all that out.

Guess I've been focusing to much on upgrades and neglecting the mechanicals.

Thanks

 

[1620jz]

Just was checking other problems and on 5/9/02 jwcfbd wrote about serious horsepower loss if chain is off by a tooth or so. Anyone have any comments on that being a posibility and if so how would I check that?

Thanks

 

[BA BUSA]

Black smoke is too much fuel blue/gray smoke would be oil burning. If the plugs are old they may be braking down under a load and not burning all the fuel. This would explain a loss of power and black smoke. I believe the manual recommends replacing the plugs every 7500 miles.

 

[1620jz]

Thanks, I'll check that out. I appreciate everybodies help. If anyone else has any ideas let me know. I'll let you know how it turns out.

Jeff

 

[dezzy7]

How did it turn out

 

[Marc Salvisberg]

Hi!

Re: Black smoke = Too rich, 99% of the time.
If it makes your eyes burnnn... RICH.
Have dealer lean out low rpm tuning - leaner than a magic air fuel ratio value - That excess fuel could be washing the oil off the cylinder walls -
That's a common problem when "tuning to an a/f ratio" - too rich and lumpy at low rpm and part throttle - because it's just not a good method.
It could be that the excessive richness has carboned up the backsides of the valves and gummed up the piston ring grooves - making them sluggish to seal - especially when the bike has been sitting a bit.

One needs a complete map of desired a/f ratios that are variable with respect to throttle opening and loading and most dj guys don't know that yet.

In other words - it might be right for the dyno, but wrong for the real world.

RE: 15 hp power loss.
Wow!
You certainly would have noticed that when you were riding if it was true - You'd lose 7 to 10 mph on top!!

Regards -

Marc