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Discussion Starter · #1 ·
ARE ORDERED! Hopefully the kit will be here Monday or Tuesday. :-D I substituted kuryakyn Pilot grips for the nostagics that are supplied, so it gave me a couple of days lead time before the kit ships.

Now I still have to get a battery so I can try them out and get it dynoed!

Does anyone have the battery demensions?

Greg
 

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Is that Mikuni a "flat side" carb? If so, I had one on my Harley FXDX, and it was the best high performance modification I could have made to that bike. Great choice, but there goes your gas mileage.
 

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Discussion Starter · #7 ·
Yes, I got the kit from bonnevilleperformance, and your right Trim, Bill seems like a really stand up guy. He treats people the way he would want to be treated, and that is rare in business today!

I can't wait to install them and try it out, while I'm at it and have the tank off, I think I will go ahead and advance the cam then bring it to the dyno.

After I get taxes back, and if I can hide it from the wife, I am going to splurge for a 904 kit, get 2mm oversized valves and send the head to extrudehone to get it ported.

You know John, I can thank you for this with all the pics you posted of your project! I thinking about it before, but the pics pushed me over the edge into action. :hammer:

Sweat, be sure to let Bill know if you already have a NARK and pods, he will discount it. (thanks Trim for giving me that tip!)

Greg

[ This message was edited by: bonnieblackinfl on 2007-01-09 16:05 ]
 

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I assumed you had already done the big bore and needed the carbs for full effect.Let us know how they work with a 790 ;not sure Ive heard of anyone doing the carbs first,then the bore.
 

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Discussion Starter · #9 ·
I wanted to be different, lol, that's why I want to dyno it after I get the carbs on. I want a good baseline for other people intrested in "just the carbs" or "the carbs and the BB" or the amount of actual difference between both upgrades. I'm pretty stoked waiting on the kit, like a kid waiting for Chrismas Day!!!!

Greg
 

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Discussion Starter · #11 ·
yes, we had that disscussion, he tried to sell me a BB kit with it. :wink:

If he would have had the grips in stock it would have shipped today and I could be riding by this weekend. Oh well, at least it will be the way I want it, I'm seriously impressed with his customer service!!

Greg
 

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Though passing curiosity has the better of me, I can't help but think that a simple carb' replacement will do little for an otherwise stock 790. I'm sure pipes & intake will be addressed, but the weakest link (an unmodified engine) can only do so much........ regardless of how much fuel is thrown at it (I'm thinking).

I could be wrong, but that's a pretty expense mod' when the rest of the package is still stock. If however a simple mod' of Mikuni's and muffler actually does something, wouldn't it be nice to squeeze more power out of a bullet-proof untouched factory engine?!
 

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If the experience of modding my bike in the past is any gauge for what he will experience with this mod...the end result on paper will seem minor when compared to the difference felt by the seat of the pants.


While my bike gained 7 or 8 horses on the dyno by adding these carbs it felt like alot more. On a big bore equipped bike, the stock carbs really hold it back when comparing to the mikuni's.
 

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WHOA!
Tell me SCC', did you already have an intake mod' and free flowing cans BEFORE that gain? Are you suggesting that the carb's alone got you that 8 horsepower?!?!?!

Or is that 7 to 8 hp gain a result of going from a box stock configuration
-to -
1) intake, 2) filter, 3) pipes, AND 4) Mikuni's???

Because if I've already got an improved intake, cans that flow nicely, and I can add significant horsies simply by replacing the carbs (and not compromising my little 790), I may hafta look into this mod!!!!
:razz: :-D :) :razz:

[ This message was edited by: Olderyoungster on 2007-01-10 13:06 ]
 

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I already had airbox removal, billet intakes, preds, 904 kit, conservatively ported head, upgraded ecu...and was looking at roughly 75 horses.


After adding the mikuni's my bike came in at nearly 83 horses.


These carbs work awesome for bigbore bonnies. The difference felt by the seat of the pants felt nearly the same when comparing adding the bb kit versus the carbs.


Dunno if he will get the same end result in increased hp or not with the stock bore, but you can bet if he add's a bb kit and flows the head Greg is gonna have a fun ride.
 

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My God..... a Bonnie with 83 horsepower to the rear wheel!?!

My heavy BMW 1150 made just a little less than that, my (heavy) Sportster 1200 made 14 hp less than that, and my slightly mod'ed BonnieBlack put a fun and healthy 61 horsepower to the tarmac...... 22 HORSEPOWER LESS THAN YOUR BONNIE!

I came from a V-twin, went to an opposed twin, and was surprised to discover that I actually like a parallel twin best. Therefore I was anxious to see the BMW/Rotax 800cc parallel twin at the motorcycle show. Danm thing fits me too.
But I've already got a parallel twin, and it's "cool"........

An 80+ horsepower Bonneville,
that has GOT TO BE one very cool, and one hella fun ride!
 

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Discussion Starter · #17 ·
On 2007-01-10 10:06, Olderyoungster wrote:
If however a simple mod' of Mikuni's and muffler actually does something, wouldn't it be nice to squeeze more power out of a bullet-proof untouched factory engine?!
Youngster, this is exactly why I am doing the carbs first! I would like to see a difference between the 2 on a otherwise stock engine and I think alot of other enthusiast would too.

I was planning a BB anyway, but with it, I want to contact Wiseco to see if they could supply true flat-top pistons with the kit, I would like at least an 11:0 compression ratio, and flow the head also.

With that comes alot of downtime, planning, and researching for machine shops. I would like to find a spare head on ebay or something to decrease the time a little, but that's proving to be difficult.

Greg

[ This message was edited by: bonnieblackinfl on 2007-01-10 15:30 ]
 

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I think a flat top piston would give you much more than 11:1. I milled of 0.3mm on the cylinders on my 904cc kit, gave me just over 11:1 and 75hp with no airbox, stock carbs and mufflers (one baffle removed) and 3 deg ignition advance
 

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Discussion Starter · #19 ·
I was thinking it would probably come in at an 11:5, I seem to remember reading thier original kit was with flattops and had 11:5, I might be wrong though.

Greg
 
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