Hank Posted December 17, 2008 Share Posted December 17, 2008 I have a 2005 Hayabusa engine in my kit car. I have a SBD motorsports dry sump oiling system. Total system capacity is estimated at 7 quarts (sump, tank, lines, and oil cooler). I took off the PAIR valve and the associated plumbing. Westfield included a header and muffler with the motor, so it's really not that modified to start with. Question is what oil is recommended for the 'Busa motor for lapping day activities and some street duty? The message forums and locals have me at 2 final options: 1) Amsoil 10w-40 Bike Synthetic 2) Mobil 1 Racing 4T 10w-40 Comments? Link to comment Share on other sites More sharing options...
R1 Seven Posted December 17, 2008 Share Posted December 17, 2008 As long as the oils are specifically made for bike engines, you should be OK with just about anyting in the recommended range. I tried some Rotella oil in my R1 Powered track car at first and got some slipping despite having a heavy Barnett coil spring clutch kit. I now run Yamalube only and have no problems. Link to comment Share on other sites More sharing options...
Hank Posted December 18, 2008 Author Share Posted December 18, 2008 Seems the masses agreed on Mobil 1 Racing 4T 10w40 synthetic. $9.49/quart at Autozone. I bought 8 quarts. I hope she don't gulp it all down! I figure I'll change the oil after every other track day to be safe. Link to comment Share on other sites More sharing options...
R1 Seven Posted December 18, 2008 Share Posted December 18, 2008 Yikes! The Yamalube is less than $5/qt. I change it after every weekend, but every other would not be bad either. Link to comment Share on other sites More sharing options...
Birkin42 Posted December 19, 2008 Share Posted December 19, 2008 Motorcycle engines, particularly those with wet clutches have very specific oil needs as they lube the engine, transmission and clutch, and generally don't work well this general automotive oils. Usually clutch slippage is the firsth problem to show up with cam and/or transmission issues being next. I used Silkolene Pro 4 with good results when I raced. They now also have a Pro 4 Plus. At $14/lt and $20/lt respectively, they aren't cheap though. They are ester based synthetic oils which you may or maynot like. Jack Link to comment Share on other sites More sharing options...
TurboBird Posted December 19, 2008 Share Posted December 19, 2008 I have used Honda's synthetic blend 10W40 with my turbo Honda Blackbird motor for the past several years. I also have a Barnett carbon fiber clutch set and springs and have no clutch slippage with this oil. Runs about $7 per quart. I would stick with oils blended for bike engines that share the engine oil with the gear box and clutch. Link to comment Share on other sites More sharing options...
Feffman Posted March 21, 2009 Share Posted March 21, 2009 We are using Elf Moto 4XT Tech full synthetic in the Radical SR3 (Busa engine as well) from Performance Oil Store (http://www.PerformanceOilStore.com). Switched from Silkolene to the Elf and found out the idle smoothed out and the engine ran a bit cooler under load. Feff http://www.MVPTrackTime.com Link to comment Share on other sites More sharing options...
Hank Posted March 30, 2009 Author Share Posted March 30, 2009 I bought 8 quarts. I hope she don't gulp it all down! For the record she took 8.5 quarts. ouch! Link to comment Share on other sites More sharing options...
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