| Author | Message | ||
     Dueller |
several years ago I got stranded in the middle of nowhere with A cracked carb on my M2. Desperate to get back on the road the only carb the nearest harley dealer had was a cv 44 SE and manifold. So I bought it and installed in order to get back home. Aside from being a little stubborn on cold start and the occasional backfire it worked fine. shortly thereafter I bought my S1w and the M2 was parked for some time with just the occasional short ride. Now I am resurrecting the M2 to be a more sedate ride due to recent health issues. It's now apparent this is way too much carb IMHO. Anybody use this carb? Suggestions other than a mikuni? Anybody got a cv 40 they wanna part with. Bike is stock with exception of s1 header, ham can air filter and cf Vance and Hines muffler. | ||
| Dueller |
Addendum....I've thought about installing it on my s1w with factory race package but it runs so sweet . And it probably is still too much for it even. | ||
| Dannybuell |
Everyone says 44mm is too big but when you look at the XB's and the size of their throttle bodies, IDK. My understanding is that non factory carbs are over jetted. Perhaps so nobody could accuse them of burning up their engine? Have you had it dyno tuned? | ||
| Dueller |
No, not dyno tuned. It does feel fat/rich in midrange. | ||
| Lakes |
I run a CV44 Bobby wood modified , he call's them rebel 43.5, that's the size he bores the venturi put to. i did not buy it for the Buell m2 i used it on a twin cam 95 cubic inch, then picked up a near new CV51 for the twin cam. a friend has a stock CV44 SE carb on a 74 cubic inch 1200cc SI factory race pipe high comp pistons 600 lift Andrews cams he rides it on street & did 11.1 standing quarter stock gear shift stock swing arm no wheelie bar 120mph 4th gear trap speed. the black dyne is the best! his 60foot time was 1.6 sec | ||
| Buellistic |
RULE OF THUMB: Just what do you plan for your engine to do ??? Get all the LOW END TORQUE in the RPM RANGE where you RIDE ??? Get ALL THE POWER from 5K RPM on until the engine EXPLODES ??? | ||
| Natexlh1000 |
So if it's fat in the midrange, do you get a differently tapered needle? | ||
| Ratbuell |
What jets are in it now? K.I.S.S. - start with some different jets and maybe a needle, and see if it can be made to work. 44 is large for a 1200...but it could be persuaded to cooperate. Dannybuell - the XB's have VASTLY advanced airflow characteristics compared to the tubers...and EFI is dynamic, compared to the static jetting of a carburetor. Apples/oranges. | ||
| Lakes |
First off, i have owned built & ridden HD's 40 years, the Buell motor is a HD be it tuber or XB , Carb or EFI 58 cubic inch or 145 cubic inch i keep the motor revving at 3,000 & up no matter, simple fact is they all use roller bearing's at big end of the rods. i got my m2 used but carb had stock lean jetting needed lot of fuel to start . i could have chose to reject the stock CV 40 , but had the Wood 43.5 Rebel i got used in good condition 12 years back & uses it for years loved it motor (my twin cam 95) ran so much smoother got better gas mileage. well i still had that carb & a friend had a SE manifold to suit. so used it thinking it would be too much carb for the 74 but my stock m2 international loved it pulled smooth started easier never noticed a loss of low end, friend gave it a run on his DJ250i with load control & afr read out, just the one run as was free he had custom mapped an EFI bike was a big inch twin cam took all day so gave me the one run to check mine out with wood carb 2" stock head pipe a restrictive australian made stainless muffler had 84 ft pound of TQ i think was 93hp as it was one run torque was faultless no dips or spikes went up at 3,000 & stayed up till 6,000 almost diesel like the HP climbed smoothly all the way i told operator stop @ 6,500 was still pulling but was not interested, i would have loved to do a timed run where it is timed wide open to see how quick it made the HP & TQ, but was not paying & not going to worry about tuning when i saw the dyne read out was perfect as was. had my friend do a angle valve job that normally shows good Torque & machine bottom of barrels to get swish up as pistons too low to get the swish to work it had the SE N4 cams stock & i had some 1.73 ration SE rockers non roller. thats it. pulls strong 3,000, latter put N6 cams in but never dyno'ed & had to take 1.73 ratio rockers out as valves too close to piston i checked. have never dynode but don't expect any more HP or TQ just moved tQ & HP up a few hundred rev but still pulls strong 3,000 just bit more up high. so i don't think the cv44 too much as they come as CV & small venturi not 44mm in venturi. but like has been stated would not see a gain unless your motor could use more air and the gain would only be at higher rev. if it is flat in mid range could take fuel out but probably need a needle just what one i don't know. Woods use's holley main jets that go up in one thou increasements for fine tune if you like playing with them also has a bigger float bowl but i ran mine as was on twin cam 95 thought would be too much but it works 20,000 mile on still good. | ||
| Natexlh1000 |
Has anyone here ever tried putting on FI? Just curious. | ||
| Dannybuell |
Ratbuell - Apples and oranges are both fruit too! The size of the throttle body(s) on any engine are a pretty simple indicator of the engines ability to breathe. The XB heads are an excellent upgrade, maybe on the next rebuild. My City bike is a 96 S1 with 103,000 miles. My Road bike is an 09 1125 CR with 20,000 miles. | ||
| Lakes |
Natexlh1000 there are a few good efi set up's a company made a good efi for HD V Twins called MoTeC has a lot of features. they also make small ECU's that you could use just need to fit sensors & a fuel pump TB, but it's a slow process to make maps . & no gain in HP or TQ but can make custom maps for say power or economy & load them when you like. just the bike will gain weight. the CV carb's work fine for me the manifold small & only one carb for the two cylinders make it easy simple to tune too. | ||
| Phelan |
Nate I'm actually planning to add EFI to my S2T, be it DDFI3 or otherwise. Really eyeing the '10 XB12 cranks as they have stronger rods, crank teeth for CPS, and 1.5" crank pin instead of 1.25". Would take a lot of mods but could be fit in a tuber. | ||
| Natexlh1000 |
I was thinking more along the lines of stock X1/S3 injection. Maps already in there. Are the M2 heads drilled/tapped for the ETS? Are normal sportster heads? | ||
| The4ork |
Dont mean to thread jack but since were talking carbs anywys... my s1 has xb12jugs and pistons, stg 3 nrhs xb heads, stock cams and cv40 with 200 jet, eclip one slot lower than center slot. I feel like the top end is being held back, do I need more carb? I want to get some cat4 cams, but im worried im being restricted. And should I be thinking of recurving my ignition? If so how? |
