The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: awaffa2003 on January 25, 2008, 07:14:30 PM
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what do you guys have to say about them? i suppose better throttle response with anything other that vacuum slide thing(somebody correct me so i don't sound like an idiot in front of people) but then you can never go wrong with stock...ok not never seeing as you must rebuilt them but you know what i mean...
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no one ever said anything about this....there's some Dellortos on ebay that i'm thinkin about buying, wondering if its worth it.
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I have no clue. When it comes to making the engine run, I try to stick close to stock.
But I am just a big chicken with only one bike.
Good luck. You might post this on Boxerworks or Motobins forum.
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your stock bings would be best, unless your trying to squeeze every last oonce of speed from that magic drop of petro and have the funds and time to rebuild your engine often.
yes there are some gains in a flat slide mikuni, yes they have a million different jets to choose from to set it up just right for everything. again if you want to ride it other than a race track its not really worth the time. money or effort it takes to run a carb like those.
remember stock carbs may not be the best for any one given situation but the best choice for overall situations. meaning it may stumble here in there like in a really damp day, but unless you live in a place like seattle then it would make sense to tune the carb to that weather.
that help? i hope.
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Please take n 2 consideration what u are trying to accomplish.
That said.
Imagine ur engine as a air pump.
The carbs are the inlet & the exhaust is the outlet.
The more air u flow the more power u get.
So just a carb change is not enough.
If you are looking for a specific performance from your bike.
Then state what it is.
I have been doing a lot of research lately in this regard.
Am tuning a bike for a run at Bonneville this year.
I started with the exhaust. Making sure it can get the air out.
Testing to assure that the engine can pull the rpm needed to keep the bike building speed untill the final drive tops out.
Then time check to determne if it reached top speed in the reqiured minimum amount of time.
You have to determine where you want to end up first.
I am wanting to top out without the engine falling out of the power band.
The power band hits & then fades or just falls off.
I have learned that it is very hard if not impossible to have max top speed & smooth power delivery.
U can get that ripping grunt from 1050 - 4000 rpm that pulls ur arms hard.
Or u can set it up to kick in later like a squirt of NOS.
U shift the power band up & down as u change the air flow dynamics.
Simply put, u can't change anything without it affecting something else.
I will revert to a more conservative set up after the speed run.
My recommendations are:
For quick response & great support = Mikuni
For overall smoothness & reliability = Bing
For hot tuning & an opportunity to obtain your degree in carbology = Dell
Both my bikes have the typical mid rpm soft spot in the powerband.
I like the low end grunt a lot. Then when the timing advance goes full on it will again put some heavy torque to ground.
But with reference to damp conditions, that kinda sucks.
I mean when the rear starts spinning at 50mph it can be unnerving.
Dells are way cool. But do not have a lot of support from what I have found out.
Mikuni are state of the art & rock solid.
Bings are, well like our Airheads, simple, reliable & versatile.
Sorry for the lenghty post.
One would think this was about: Tires, Oil & Politics; Oh my!
HTH
Troy
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Sorry, forgot to add this.
Be sure to check what other bits u will need to add anything that is not stock to ur bike.
Like diff cables, inlet turbes, etc.
Stock parts are most times easir to get for repairs.
Where custom set ups can be a pain.
For my R65 I am staying with the Bings.
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Thanx guys! those dells got taken off ebay for local sale but the info was great. im not really looking huge performance upgrades just little things here and there because to me, its like why would i try to make a 650 go faster if there's the 100's out there n stuff ya know (if i ever get my hands on a R100.....). but quicker throttle response would be nice.
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If u go as lean as u can without damaging anything. Then u will have the max amount of throttle response u r gonna get for that set up.
Remember, T00 LEAN WILL DAMAGE THE ENGINE.
I found that the valve adjustment settings can give different response too.
4 & 8 that is what has worked best for me.
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troy, this may sound dumb. but whats 4 & 8.
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Those are the standard intake / exhaust valve clearances, in thousandths of an inch (.004" in, .008" exhaust), or
generally given in mm (.1mm and .2mm)