michaud321 Posted January 23, 2009 Report Share Posted January 23, 2009 i have full fmf and twin k&n filters im pretty new to banshees because i bought this one with a blown tranny and now im starting to build the complete engine back up (a 66mm or maybe 68mm) do i have to to get a different dome to match with the bigger piston?? what is the biggest sleeve you can run with stock carbs and stock head?? i will be running a stock crank im pretty sure im going to port it also or will just the port job be too much for the stock carbs?? what is the limit for stock carbs?? i've read too that a bigger sleeve is a horrible dollar to HP ratio, whats the a better dollar to HP ratio with stock carbs? Quote Link to comment Share on other sites More sharing options...
lowbuckracing Posted January 23, 2009 Report Share Posted January 23, 2009 ....Depending on what ridding your gonna be doing,Will determine the kind of upgrades you should do....Lots of options..Let us know.. Quote Link to comment Share on other sites More sharing options...
blaster2006 Posted January 23, 2009 Report Share Posted January 23, 2009 why dont you just get bigger carbs then lol. and get the porting and boring you need. you can easily find like 34 PJs online used from ebay and other 33s and 35s etc... as for your other questions, i have no idea Quote Link to comment Share on other sites More sharing options...
05.Banshee.SE Posted January 23, 2009 Report Share Posted January 23, 2009 From what I hear, going to a 68mm on stock jugs isn't worth it, and you should run a Cheetah setup instead. If you're getting ported, you don't want the stock carbs...especially if it's a drag or dune port. I think you need to run big bore domes on the 68mm, not sure about the 66. Quote Link to comment Share on other sites More sharing options...
michaud321 Posted January 23, 2009 Author Report Share Posted January 23, 2009 thanks this bike will be for play, ripping up and down roads, climbing and playing around in sand pits,mx style of riding, nothing too extreme but i want it to pull pretty good i ride with 450's and a raptor 700,mostly stock i defenitly dont want to be behind the group, i just want to be faster then them lol Quote Link to comment Share on other sites More sharing options...
lowbuckracing Posted January 23, 2009 Report Share Posted January 23, 2009 For what ur doing sounds like you could do a dune play port and be fine...some stock carbs set up with the right jetting,coolhead and advance timing to+4,that bike will run real nice..On the longevity of the cylinder im not a 100% on the last bore...You can always find virgin cylinders from all the guys upgrading to cubs and cheetahs.If you wanna go bigger and faster just add a 4 mill crank have your port durations ported to accomidate your build and upgrade your carbs..Good luck,/JB Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted January 24, 2009 Report Share Posted January 24, 2009 From what I hear, going to a 68mm on stock jugs isn't worth it, and you should run a Cheetah setup instead. If you're getting ported, you don't want the stock carbs...especially if it's a drag or dune port. I think you need to run big bore domes on the 68mm, not sure about the 66. I run a pair of stock cylinders that have been ported and resleeved. Here is how I looked at it. I got the cylinders for dirt cheap, they needed resleeved. A new port job was the same price as having my cylinders resleeved (sleeves and labor) by the same guy that ported them. So for the same price you can end up with two options #1 Ported Stockcylinders with oem sleeves that have 64-66.5 bore #2 Ported Stock cylinders that have been resleeved and have a bore of 66mm to 68mm I know people say that big bore sleeves suck because the choak the transfer ports. Well you have to understand that there are quite a few different sized sleeves. Mine are not much bigger than stock. I can see there point on a sleeve that goes half way into the cylinder stud hole. It is NOT economical to have a set of cyinders both ported and resleeved, but if you can get a pair of cyinders that are already ported for dirt cheap then it is a different story. josh Quote Link to comment Share on other sites More sharing options...
Darthwall Posted January 24, 2009 Report Share Posted January 24, 2009 last I checked it was around 180 per sleeve to have big bores intalled and around 100 per sleeve so your loooking at 580 for the cylinders plus the porting and that could run from 200 to 600 bucks depending on what you do with them Quote Link to comment Share on other sites More sharing options...
deckheight Posted January 24, 2009 Report Share Posted January 24, 2009 Typical aftermarket dome bore diameter is 66mm. So you probably should be looking at big bore domes beyond that. Good cylinder porting will work with stock carbs, usually works even better with larger carbs as long as they are not too big. 30mm-33mm carbs seem to hold a tune real well. But some people like a little bigger or smaller... If you want low end response and easy tuning over a higher rpm motor, stick with smaller carb sizes. Nothing wrong with big bore cylinders, however, for the money, most people opt for a long rod +4mm crank instead of a big bore set-up. Don't discount stock stroke/small bore engines though, they can be made to run fairly strong also. A lot of high octane fuel can be bought for the price of either a stroker or big bore motor package. Lot of people running +4mm strokers/stock carbs and like it. See no reason why it wouldn't be a similar scenario with a big bore stock vs. bigger carbs. i have full fmf and twin k&n filtersim pretty new to banshees because i bought this one with a blown tranny and now im starting to build the complete engine back up (a 66mm or maybe 68mm) do i have to to get a different dome to match with the bigger piston?? what is the biggest sleeve you can run with stock carbs and stock head?? i will be running a stock crank im pretty sure im going to port it also or will just the port job be too much for the stock carbs?? what is the limit for stock carbs?? i've read too that a bigger sleeve is a horrible dollar to HP ratio, whats the a better dollar to HP ratio with stock carbs? Quote Link to comment Share on other sites More sharing options...
00tbanshee Posted January 24, 2009 Report Share Posted January 24, 2009 pretty much everybody covered what you was asking.but here is what i would do get yourself a nice dune port and you could still run your stock carbs with hardly no power lost for the type of riding you do.don't waste your money on big bore sleeves it's not worth it.shop around there is alot of really good guys on here that do really nice port work. Quote Link to comment Share on other sites More sharing options...
michaud321 Posted January 24, 2009 Author Report Share Posted January 24, 2009 thanks alot guys, this is one of the most helpfull post ive read, my motor will actually be a little cheaper then i thought Just to recap, i can get the power i want with stock piston and carbs and with a good port job??? just by giving it a good port job where will i be compared to the 450's ive read that the +4 timing plate is a very good upgrade for the money? where does that give you the power?(low,mid,top) will that work well with a basicly stock motor,just ported Quote Link to comment Share on other sites More sharing options...
00tbanshee Posted January 25, 2009 Report Share Posted January 25, 2009 thanks alot guys,this is one of the most helpfull post ive read, my motor will actually be a little cheaper then i thought Just to recap, i can get the power i want with stock piston and carbs and with a good port job??? just by giving it a good port job where will i be compared to the 450's ive read that the +4 timing plate is a very good upgrade for the money? where does that give you the power?(low,mid,top) will that work well with a basicly stock motor,just ported stock carbs yes. stock pistons will hold you back alil.get yourself a set of weisco pistons so they can be cut.i know with one of kevin from herr jugs racing's aggressive dune ports with piston mod, a cut head and a set of shearer inframes you will have no problem smoking those 450's unless they have really deep pockets.timing plate will help out too.bump the timing up and get alil more bottom end Quote Link to comment Share on other sites More sharing options...
deckheight Posted January 25, 2009 Report Share Posted January 25, 2009 What I was getting at is that for the cost of a stroker or big bore you could buy 150-200 gallons of 100 octane fuel (5gl at a time of course) and run higher compression which = instant horsepower. All the other stuff you would have to get anyway... Head, porting etc. As long as you can transfer the higher horsepower to the ground effectively you shouldn't have any problems with a stock 450. I don't think you would be happy with just the added 22cc displacement of the big bore on pump gas or the added 26cc of a stroker... And yes the +4 timing is a good mod. You will feel it in low end and midrange response. Quote Link to comment Share on other sites More sharing options...
Darthwall Posted January 26, 2009 Report Share Posted January 26, 2009 making power is a game once you have one thing done then you will move up another step and another step get it over with! save your money get a bad ass topend and build the bottom for it there is no point in building the top so extreme that the bottom cant hold it anyways if you want some power you are goingto have to step up to race gas or atleast octain booster Quote Link to comment Share on other sites More sharing options...
michaud321 Posted January 26, 2009 Author Report Share Posted January 26, 2009 ive got alot to think about now, ive got an idea now of what im going to do the reason im asking now is because i got this bike at the starting of this winter with a busted tranny, so im slowly starting to fix it for the summer coming, the engine is completly apart now and im going to figure out what engine mods im doing before i buy any parts to fix it i really dont mind running octain boost but race fuel is a bit hard for me to get. if i would want to run octain boost what would the compression ratio be? or compression? whats the best way to do this? or is the only way is to get a high compression piston? sorry as u can tell im real new to banshee mods, i know my ski-doo's like the back of my hand but not banshee's at all thanks again guys Quote Link to comment Share on other sites More sharing options...
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