yes, and the 28-7 makes even more raw power then the Roma.........The Bonito is the King of race .21's if your looking to power a Truggy....You would be very hard pressed to find another .21 that can power a truggy the same way the Clocked Bonito can........ However the Roma is a .25 and has more displacement to work with and a fairly similar engine design, so it is to be expected it will make more HP....

Does anyone know what size the washer is between the high speed needle for a b6 pro? thanks

:>(

I got to try James' 'truggy' P5 tonight to compare it to my 'buggy'P5. I felt it had same bottom and top, but the truggy P5 has more mid. No run time comparisons.

Plenty of nice dry tracks here to get that testing done on the Tomato ;)

:eek:Oh MY!! I guess You'll be getting a call this week for another order.:D

Bottom end?
 

I have a buggy p5 that feels like it has no bottom end. I could be tuning. I have only put about 1/2 gallon through it or less. It was broken in for me. It has nova 9889 pipe. 41021 header, werks #6, werks 30%, m2c steel with all weights around the outside. Med shoes, .9 .95

I did some tuning on the p5 yesterday and these engines can hide a rich bottom needle just like Neal said :D so just lean it out. I never found a ping but I took 3 hours out of the bottom, which is a lot for these carbs.

I think you really went super soft an the whole clutch set-up. Steel flywheel with all the weights and your springs are too soft. I think you are confusing no bottom end with a boggy clutch set-up.

1.Take out the set screws from the flywheel
2. change the 2 .9 springs to 1.0 springs
3. after your shoes are burnt up, switch to reg hard shoes
4. re-tune from there

Humm I have never heard of a soft bottom but like James says the clutch is very important. Play with the # of screws in the flywheel and go up on the springs swap out the .9 for 1.0 springs. Hell I have a cb that's 1 too larger than stock and there's pleanty of bottom, mid and top for that matter. Play with the clutch

That motor should pull 2 .9 and 2 .95 springs with no issue and ALL the grub screws in the clutch...Idle gaps to large bottom to fat top to lean most likely the issue...

how big is your idle gap ? M2C steel with all weights is not needed for a Buggy mod P5..... that IMO is a bad idea.......

I tell everyone to not add all that weight when they are learning to tune the engine, all you do is make it much more difficult to find the sweet spot........ Start with a regular M2C flywheel, no weights, 1.0 springs, hard shoes..... learn to tune the engine, if the engine becomes too powerful down low then start looking to detune it......... right now you have neutered the engines bottom end with all that weight and the med shoes....its doing exactly what I would predict it would do with a setup like you have put onto it........

If you guys have both engines properly tuned and equally setup you will see the truggy mod has more bottom end and midrange explosiveness......The truggy engine has higher timing across the entire engines as well as lower blowdown timing...The Buggy engine runs overall lower timing with a higher blowdown timing......Put both engines into a Truggy with equal clutch/fuel/pipe and you should see quite a large difference in power......

The clutch set-ups are allot different between my engine and Toms. I "tamed" my Truggy P5 for the buggy. I was chasing the tune all night though so it needs a tear down and inspection. It seems like with an optimum tune I get ghost flames and with a safe tune it runs good with horrible fuel milage. Something is up inside the beast. Time to bust out the tools

Any Hockey fans !!!!!!

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