Originally Posted by PowerHouse (Post 9519909)

It does look impressive brother!! The Bonito being based off the Toro is softer on bottom than expected as the Toro was as well but the transfers are a couple degrees lower than the Toro so it isn't as soft. The 2084 or 9853 and the 21 seems to be a good pipe for the stocker but I like the 9901/20 after I do my work on it. I have been getting 12+ minutes on a tank driving normally and usually pit between 9-11 minutes depending on track, tune and setup. The biggest thing that engine design needed was a intake timing change, exhaust port timing change and the crank filled. Playing around with the timing and fill will yield different results but a basic fill puts you in a good ballpark and what I also do and have had great results is making the satalite ports and main exhaust port open at the same time as it yields the most possible exhaust surface area at the start of blowdown giving the engine the best possible low end response. I think alot of the soft bottom was because the satalites were opening a few degrees before the main port and it was bleeding down before it had enough surface area to blowdown and scavage correctly giving the engine that soft feel but with the right changes, it goes from being a ho hum to one of my favorites.

Originally Posted by morocho1979 (Post 9560520)

Hello im running Nova P5xlt with 25% of nitro i want to use 30% i need to put another shim ??? im running in hi altitude 3300ft over the sea

Originally Posted by Izekael (Post 9571284)

I bought a bonito and right now I am having trouble keeping it running. I set the carb to the factory settings and it shipped with the blue venturi. I'm in el Paso tx. Alt is around 3500 ft temp upper 90's durning the day and mid 80's at night 30% fuel. It loads up like an sob. I am thinking of going with a bigger venturi in the carb.

Originally Posted by Izekael (Post 9571458)

Am I reading the chart wrong. I would of thought a colder plug for the higher ambient temp

Originally Posted by Izekael (Post 9575513)

I got it fired up. Hs is still rich. Ls is just ever so slightly below flush but it sounds angry is that ok.

I also added a return spring on the carb is that ok

Originally Posted by air8 (Post 9583892)

Head shim question.

High air temps and high humidity. Is it advisable to add a shim under the head button? Add maybe a .10 shim.

Originally Posted by BIGTIME (Post 9593818)

What does this equation equal... torn carb boot + bad leaking front bearing + high elevation + 100 degree weather

Originally Posted by BIGTIME (Post 9593818)

What does this equation equal... torn carb boot + bad leaking front bearing + high elevation + 100 degree weather

Originally Posted by savannahmick (Post 9595713)

I had to use Odonnell SP Blend 30% to break-in (1gallon) and now I got my Bryons 30% 11% case. Anyway I wanted to tune motor to fuel this afternoon and had hard time trying to decide which way to go with needles. I richened top about 2hrs of the bat and top end seems good but I am having a time getting idle to smooth out it's tough because it seems to load up and rev a little when I get off throttle and then drop but it's a little unstable up and down like it's lean but if i richen it stalls .5 mm gap idle. Tons of smoke on bottom when accel. Temps are low while running 210f and 190f idle if I had alot of time I could figure it out but working late and racing early Saturday. I didn't really want to use Odonnell but I kind of started liking it despite low oil content still had pinch after 1 gallon after two tanks of Bryrons metal pinch is gone same running temps with both fuels. Other than idle unstable motor runs great and will idle forever. How tight should the pinch bolt be I hope I didn't tighten to much.(air leak?) Any ideas or help , Thanks!

Originally Posted by BIGTIME (Post 9593818)

What does this equation equal... torn carb boot + bad leaking front bearing + high elevation + 100 degree weather

Originally Posted by John. (Post 9596148)

Robert Battle took the win with his Bonito 7xlbs. Robert had a very cleaver strategy for the final: he was the only driver refuelling around 9 minutes; this allowed the spanish ace to pit-stop one time less than his challengers and took the win.

Jerome Aigoin took the pole position with his PLUS 4 BTTS, led the main final for almost 30 minutes and took a very good 2nd place.


Configurations

Riccardo Perin:
Novarossi Bonito 21-7XLBS – Novarossi C6TGC glow plug - Novarossi 41021 header – Novarossi 51006M pipe

Jerome Aigoin:
Novarossi PLUS 21-4BTTS – Novarossi C6TGC glow plug – Novarossi 41021 header – Novarossi 51006 super strong pipe

Robert Battle:
Novarossi Bonito 21-7XLBS – Novarossi C6TGC glow plug – Novarossi 41029 header – Novarossi 51006M pipe

http://www.buggy-sport.info/index.ph...ce-report.html

Originally Posted by crittertoo (Post 9606660)

I recently got a Bonito XLB. Ran about 2 gallons of Cosmos 30% fuel with a Nova 6 plug in 1 week. And I have been chasing the idle ever since. I have not reshimed, she is still at 2 X 0.3mm and 1 X 0.2mm.

Problems I faced : -

1) erratic idle and flames out easily
2) When she is at operating temp (125-135 C), she gets difficult to start. I have to open the fuel lid, insert the glow starter and only then will she starts. And after she starts, I need to gun her to clear the bottom. If I do not gun her, she bogs and flame out. I know i need to lean the LSN to clear this, but at 130 C, I still need to lean the LSN? LSN is about flush, looking directly at her, she is about 3-4 o'clock.

I guess 1 and 2 are related but I have been chasing those 2 for days and nothing that I do seems to get me closer to the perfect tune.

No air leakage. Pressure hose is about 10 inches. Clean air filter.

Anyone knows where I can get Nova shims part no 03005xl, 03003xl and 03001xl?

Your assistance is greatly appreciated.

thanks

Originally Posted by houston (Post 9606704)

.

Pull the .20mm shim

richen the hsn and lean the lsn

Originally Posted by crittertoo (Post 9606716)

Thanks Houston for the prompt assistance, I will do that tomorrow and hopefully the chase will be over :)

any idea where do I get those nova shims?

Originally Posted by houston (Post 9606727)

I can get you some if you want but all you need to do on that engine its pull the .20mm

Xl stroke equals different shimming

Originally Posted by nick64merc (Post 9607302)

Monty would you recomend removing that shim on any of the bonito's after they are broke in?

Originally Posted by houston (Post 9606704)

.

Pull the .20mm shim

richen the hsn and lean the lsn

Originally Posted by crittertoo (Post 9609663)

HOUSTON....YOU ARE THE MAN...pulled the 0.2 shim today (total shims of 0.6mm). Bonito was purring like a cat...low end was awesome and the high was very pretty decent.

At operating temps 130-140c, she still is a bit difficult to start, i still had to open the fuel lid to get her started, and gun her to clear her (i've just put in a new nova 6 plug). It wasn't as bad as compared to when I had the 0.8mm total head shims on.

Any idea what does that mean ? My interpretation of this symptom is the LSN is still rich, therefore flooding the carb, but at temp of 130 - 140 C, I am hesitant about leaning the LSN.

Houston, I would love to hear your diagnosis on the above matter...:)

Thanking you so much for all your assistance.