Author Topic: 38 vs 42.5 mm (Read 2876 times)

Nopick · « **on:** November 19, 2013, 09:22:31 pm »

Comparison of a stock 38 to a bored 42.5.

Buckeye513 · « **Reply #1 on:** November 19, 2013, 09:41:58 pm »

I thought the biggest you should bore the stock carb was 41.5mm?

PCS · « **Reply #2 on:** November 19, 2013, 10:03:19 pm »

one is bigger than the other

what specifics would you like to know

Buckeye513 · « **Reply #3 on:** November 20, 2013, 04:38:37 am »

Pcs I think he was just trying to show the size difference between the two.

Nopick · « **Reply #4 on:** November 20, 2013, 06:26:27 am »

Yep. Just for folks to see the difference.

Q bores them to 42.5. Jerry sticks with 41.5 because you can get leaks around the side of the slide requiring larger pilot and possibly needle jet. I have not had any tuning problem with the 42.5 so far.

Buckeye513 · « **Reply #5 on:** November 20, 2013, 06:58:54 am »

The difference between stock and a bored carb is gaping.

Yeah I'll stick with my 41.5mm if I wanna go bigger which I am for my drag setup I'm going with a vm44. Anyone know if the vm44 can be bored and if so to what diameter?

Q2W · « **Reply #6 on:** November 20, 2013, 07:32:23 am »

Quote from: Buckeye513 on November 20, 2013, 06:58:54 am

Anyone know if the vm44 can be bored and if so to what diameter?

ive seen them bored to 46mm

Zilla273 · « **Reply #7 on:** November 20, 2013, 07:41:11 am »

are u sure your not thinkin of the vm44 bored to46 ? the stock zilla carb wouldn't except a 46 bore, its not even that thick?

cworobec · « **Reply #8 on:** November 20, 2013, 07:48:01 am »

Hey Derrick why not just run a lectron? That's what I run and I love it.

Buckeye513 · « **Reply #9 on:** November 20, 2013, 08:02:35 am »

Zilla he's talking about boring a vm44 to 46mm

Chris I'd run a lectron but don't have $300-$500 to shell out for one. And I'd be clueless as to how to set it up and tune it I just learned how to semi get my mikuni right. I'd probably drive Shearer nuts with lectron questions on Facebook lol.

Nopick · « **Reply #10 on:** November 20, 2013, 08:22:26 am »

In my experience (opinion) , Lectron carbs suck for anything but drags or Hill shooting. I just traded a Lectron for a stocker so my dad's Zilla would have throttle response like mine.

I hated hated hated the way the Lectron made the Zilla run.

Buckeye513 · « **Reply #11 on:** November 20, 2013, 08:35:37 am »

That's another reason I'm more likely to run the vm44 because I could drag with it and also trail ride with it. With a lectron I'd be swapping carbs from the drag strip to the trails.

Rainman56 · « **Reply #12 on:** November 20, 2013, 08:43:50 am »

Quote from: Cworobec on November 20, 2013, 07:48:01 am

Hey Derrick why not just run a lectron? That's what I run and I love it.

X2 on the Lectron.Had some issues initially but getting the right needle is key.What needle you running Cworobec?I,m running the 7-2XL.Came with a 6-2XL but was too lean on top.

Rainman56 · « **Reply #13 on:** November 20, 2013, 08:53:34 am »

Quote from: Buckeye513 on November 20, 2013, 08:35:37 am

That's another reason I'm more likely to run the vm44 because I could drag with it and also trail ride with it. With a lectron I'd be swapping carbs from the drag strip to the trails.

A Lectron can be trail ridden with no problem.The 38 on my 250 is the best carb I,ve run hands down for trails,MX,drags.Bought it used and it had some issues but nothing a rebuild kit/gaskets wouldn,t fix.And the 44 on my 500 is far better than the Keihin 39 PWK I had on prior.Had some issues getting the 44 setup,make sure you have the proper needle as well as the correct needle and seat(gravity or fuel pump).Add on an adjustable pj and your good.

If you look around you can find some used ones for reasonable $$$.I sold a spare 44mm lectron a couple months ago.Needed cash and let it go for $175 canadian to a local guy.Bought a 44mm from a member on here for like $200.

If anyone wants a like new 39mm PWK from DR let me know.I,ll let it go pretty cheap.Shoot me an offer via PM.

cworobec · « **Reply #14 on:** November 20, 2013, 10:04:52 am »

I run a 48 lectron on my bike, and I ride in the woods and the dunes and the Rocky Mountains, hands down that carb works great for everything I do and easy to tune.

Zilla273 · « **Reply #15 on:** November 20, 2013, 11:14:01 am »

Ive been told the vm can be bored to 46 but it doesnt make a real differance, not even on the dyno, this was my plains as well, but now im just gona run vm44 with out boring it.

Buckeye513 · « **Reply #16 on:** November 20, 2013, 11:41:24 am »

I wonder what the power gain would be going from a 41.5mm flat slide to a 44mm round slide. Cause to be honest I don't need any more power on the trails at all until I get lots more seat time on my Zilla under my belt.

cworobec · « **Reply #17 on:** November 20, 2013, 03:03:11 pm »

Don't need more power??? There is always a need for more power! Lol

GrkGuy · « **Reply #18 on:** November 20, 2013, 03:20:17 pm »

he is scared of it, lol
i have a 48 lectron also, havent put it on yet, but i rode CR's bike with his and i freaking loved it. i thought it worked very well with his set up. you can feel it spool up, almost like a turbo kicking in. this was drag racing tho. i would take off and then a sec or 2 later you could feel it pulling to the moon, front end was down when i started and then all the sudden it was standing straight up on me when that thing started sucking the air in.

Nopick · « **Reply #19 on:** November 20, 2013, 03:48:01 pm »

Quote from: GrkGuy on November 20, 2013, 03:20:17 pm

he is scared of it, lol
i have a 48 lectron also, havent put it on yet, but i rode CR's bike with his and i freaking loved it. i thought it worked very well with his set up. you can feel it spool up, almost like a turbo kicking in. this was drag racing tho. i would take off and then a sec or 2 later you could feel it pulling to the moon, front end was down when i started and then all the sudden it was standing straight up on me when that thing started sucking the air in.

...and that is why I didn't like it. It killed the instant low end power and throttle response that Zillas are known for. I had to wait for the spool up. I think it might just be the fact that the intake velocity is lower due to the large diameter tract.

I am not saying they are bad carbs and I am not trying to talk anyone out of using them. I just didn't like what it did to the low end of the power curve. The traits I did not like followed the carb from my Dad's Zilla with a V1 pipe to mine with a V2 so, it was the carb causing the laggy power... I talked to Dennis Packard about the set up. He said I had the right metering rod and recommended a starting length. It didn't help. Richer and leaner adjustments to the rod length didn't help...

I did love the ease of adjustment though. I wish it would have worked out.

Q2W · « **Reply #20 on:** November 20, 2013, 04:08:09 pm »

I know a couple of guys that switched back to the 42.5 for the low end power. Just depends on the type of riding you plan to do.

Rainman56 · « **Reply #21 on:** November 20, 2013, 05:11:34 pm »

Anyone tested the standard lectrons standard 2mm taper vs the HV 4mm?Both mine are the standard 2mm,never had a HV as of yet.I really haven,t noticed the 500 "spool up". Then again that's with a 44 not a 48 and stock small intake cylinder.Running the V1 pipe as well.

LT500Kid · « **Reply #22 on:** November 20, 2013, 05:11:49 pm »

I have the 48 lectron on my hybrid and I love the ease if tuning! People say its only a drag carb but I trail ride with it and haven't had a problem. It definitely likes wide open better than putsing around

GrkGuy · « **Reply #23 on:** November 20, 2013, 05:25:39 pm »

i thought everyone rode wide open, lol

PCS · « **Reply #24 on:** November 21, 2013, 10:30:35 am »

Ive ran my lectron carb on desert trails and dune rides and haven't had any issues. One of the problems that Kevin, at lectron, explain that lots of the issues with trail type riding can be addressed with by running the larger fuel bowls and a different float set up. They usually come set up to run drag races hence they don't work well for trails. If u set them up trails they can work better. As for losing throttle response, u can't make a fair comparison between 2 carbs unless they are of the size to begin with

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Author Topic: 38 vs 42.5 mm (Read 2876 times)

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