Carbs for 1015cc or 1075cc Upgrade

timebomb33 wrote:

go with the 29smoothies the differance between the 29's and 26's is amazing i'll use what i learnt at the track the beast i went with my 1075 street bike with the 26's was 11.60 at 112 mph with the 29's on the same weekend i went 10.82 121mph and ridding around town it is also more responsive by a bunch they definitly wake up a 1075 kit.

Absolutely agree with Timebomb!

29's will work well on that 1075 motor. Problem is they want so much money for them these days that you're better off IMO to grab a brand new set of Keihin CRS29's or 31's Add some nice drop in cams and have a ball.

34cv carbs are not bad with a jet kit installed but they don't give the crisp midrange acceleration a true performance carb does. They'll work but dollar for dollar, you're better money is spent on new CRS Keihins..

Take that motor stock. You're pumping about 62HP at the rear wheel.

Add some drop in cams, like to old Andrews 2x with a rack of 29's and you're now at about 74HP with 55 ft/lbs Torque.

Go to 1075, push 83CFM @10" through the head @ .350 lift, Web110 cams [touch more than the 2x] and you're in the 105HP zone with 75 ft/lbs of torque.

Nice big gaines from choosing the correct parts.

Want a really nice cam for it? Call Web and ask about their #45 grind.

There are some pretty generous dyno's out there spitting out smiles for people......


JMO

Larry C

I got my jets from Jeff and i am going to install them today.

I think i'll order Sudco's carb book and do some reading.

There is a lot of info here to be digested. Good reading here also. Roy

Larry C

Can you speak to the street-ability of an engine running the setup you listed? I'm not looking for a drag bike or race bike, just a hot bike that I can take on the road for (at times) days at a time. Would the Webcam 110's and the Keihin carbs be a good combo for a daily driver or does it remove drive-ability of the engine day-to-day?

Thanks for your input!

Larry - I also see on your web site that you say the Webcam 118 needs a new cam chain - do you specifically mean that the cam chain needs to be a different length or just replaced with an OE cam chain?

DoubleDub wrote:

Larry - I also see on your web site that you say the Webcam 118 needs a new cam chain - do you specifically mean that the cam chain needs to be a different length or just replaced with an OE cam chain?

Sorry for the dealy. I'be been busy and today is my birthday as well:)

Regarding the engine setup in your previous question. YES, it's a perfectly streetable. PM me and I'll put you in touch with a guy that has that exact setup. He just got it together and on the dyno. It went from 74HP - 55Ft/lbs Torque to 104HP - 77 Ft/lbs Torque. It's making like 92HP at 6500RPM.

Out of that 30HP increase, I'd dare say 20 of it came from the cylinderhead porting. That's 5HP per cylinder at 25$ per HP.

I personaly would go with the Web #45 Grind cams. They are not drop in. The 118 grind is a nice street cam, with or without head work.

The 110 & 45 Grind really shine with a flowed head. Or vice-versa...depends on how you look at things I guess.

Here's the story behind the cam chain.

You can take any drop in cam and bolt them in with stock sprockets on 110 lobe centers and they'll work fine. With an old cam chain, there's no way of knowing how muct later than 110 you'd be on the intake cam.

Once you get above that level of cam, they really should be degreed in. These motors are old. Cam chains stretch. A new cam chain is always advisable in a performance type application.

Here are 3 Web streetcams with more than the standard information. That 45 grind will put some ft/lbs where you want them

Master # Lift Dur@.020 Dur@.050 Dur@.100

45 .415 268° 244° 220°
110 .395 284° 256° 228°
118 .365 283° 246° 216°

Larry whats your web adress again?

Thanks again, Larry!

For some reason I always struggle with the numbers on cams...once again there is more to learn.

This one just won't die, will it.... :laugh:

One quick question - if I change carbs, do I need a different sized set of "manifold" boots specific to those carbs?

if you stick to 29 smooth bores you can still use the stock boots in place but if you go to the 34 cv's then you need to go to j manifolds in fact for 33 smoothbore mikuni's you also have to change them to the bigger ones as well i'm not sure about the 29 cr's but for 33 cr's yes you do.

larrycavan wrote:

DoubleDub wrote:

Larry - I also see on your web site that you say the Webcam 118 needs a new cam chain - do you specifically mean that the cam chain needs to be a different length or just replaced with an OE cam chain?

Sorry for the dealy. I'be been busy and today is my birthday as well:)

Regarding the engine setup in your previous question. YES, it's a perfectly streetable. PM me and I'll put you in touch with a guy that has that exact setup. He just got it together and on the dyno. It went from 74HP - 55Ft/lbs Torque to 104HP - 77 Ft/lbs Torque. It's making like 92HP at 6500RPM.

Out of that 30HP increase, I'd dare say 20 of it came from the cylinderhead porting. That's 5HP per cylinder at 25$ per HP.

I personaly would go with the Web #45 Grind cams. They are not drop in. The 118 grind is a nice street cam, with or without head work.

The 110 & 45 Grind really shine with a flowed head. Or vice-versa...depends on how you look at things I guess.

Here's the story behind the cam chain.

You can take any drop in cam and bolt them in with stock sprockets on 110 lobe centers and they'll work fine. With an old cam chain, there's no way of knowing how muct later than 110 you'd be on the intake cam.

Once you get above that level of cam, they really should be degreed in. These motors are old. Cam chains stretch. A new cam chain is always advisable in a performance type application.

Here are 3 Web streetcams with more than the standard information. That 45 grind will put some ft/lbs where you want them

Master # Lift Dur@.020 Dur@.050 Dur@.100

45 .415 268° 244° 220°
110 .395 284° 256° 228°
118 .365 283° 246° 216°

Larry,
I guess you are an old goat, now! (you know, I love you)
Tell me in simple English. The #45 grind, is it in the 280*(+/-) range @ running clearance?

If so, that would be a dam good, upper mid range, torque cam.

What is your projected RPM range on that cam?

Do you think, it will work, in any size motor?.....John

PS - HAPPY B DAY!

Dear Double Dub

I know this is your thread, would you mind, if Larry and I openly chatted alittle?

Larry,

If Double Dub doesn't mind? Could you and I openly chat about cams & heads as friends? We will act like, no one else, is reading it. All are welcome! If Double Dub wants to save this thread, I understand! We could start a new one.
Larry, that is, if you don't mind talking in public?