BS34's, or 29 Smoothies, or ???

Ok, got the motor off to machining, suspension parts are on the way, bike is stripped down and im ready to start fabing my mounts (when everything gets here)... In the meantime, I need to give my carbs some attention. So I need some advice...

Do I keep and rebuild the BS34's?
Do I pursue the 29's that I have a line on?
Or do I buy something else?

Basic specs of the build is 1075, 10.5:1CR, .418 lift cam, mild porting, 4 into 1, with Pods.

I know a lot of you guys have some real world experience in this area, so any advice would be appreciated.

Thanks in advance,

Jack

29s would be nice if you can get them reasonably,late model 28 pumper carbs would work good also

wireman wrote: 29s would be nice if you can get them reasonably,late model 28 pumper carbs would work good also

That leads to another good question, what would be a "reasonable" price to pay for 29's?

i wouldnt pay more than 300-400 myself for a set since you can buy brand new cr's for around 700 and change ,and you have more size options for the cr's

wireman wrote: i wouldnt pay more than 300-400 myself for a set since you can buy brand new cr's for around 700 and change ,and you have more size options for the cr's

29's are starting to generate stupid money and wireman brings up an excellent point...they are still making quality aftermarket carbs that work well and USED 29's are approaching their prices...why bother with 29's (unless you can get them less than the US$700-$800 buyers are currently asking)...remember though, you may drop $400-500 on a set of 29's and still have to have them rebuilt.

Take your build and substitute .410" lift cams with a stage 1 port (+30% flow) and that's what I'm doing. Larry Cavanaugh suggested RS34's for my setup. Just sayin'.

Thanks guys, I appreciate the feedback. I am thinking I may be able to get the 29's for 250~300 bucks, but won't know for sure til next week. (guy is out of town)

Test.. I have actually been following your thread for awhile. Love the build, I will have to do some checking on the RS34's as an option.

Jack

Boostable wrote: Ok, got the motor off to machining, suspension parts are on the way, bike is stripped down and im ready to start fabing my mounts (when everything gets here)... In the meantime, I need to give my carbs some attention. So I need some advice...

Do I keep and rebuild the BS34's?
Do I pursue the 29's that I have a line on?
Or do I buy something else?

Basic specs of the build is 1075, 10.5:1CR, .418 lift cam, mild porting, 4 into 1, with Pods.

I know a lot of you guys have some real world experience in this area, so any advice would be appreciated.

Thanks in advance,

Jack

I'm thinking about doing something similar with my Z1000R but I'm still in "research mode" seeing how I got a hard time figuring out the gains of a 1075 or 1105 high comp wiseco kit and comparing that to what more I have to do to the engine to make the kit work as intended.

I've been looking at the RS34's seeing how they are 100$ cheeper then the Keihin CR's but I'm leaning more towards the CR's 29's or 31's at this stage.

Seeing how my riding style would probably never, or very seldom, take me past 100 mph I'm trying to figuring out the best way to gain performance in the low- to mid range willingly sacrificing some mph and pull at the top end.

I'll follow your progress with interest!

/Otto

I have 29s on one and 34cvs on another, both run really good. Id go the cheapest route. If youre running pods the 29s are easier to get right, 17.5 pilots, 120 mains, try the needle in the middle to start

If you are looking for bottom-end and mid-range, I'd go for a bigger bore. 1075 would be better then a 1105 as it leaves more cylinder wall meat then the 1105 and would be better for the street. Some guys are running the 1105 set-up and not having any problems but I'd stay with the 1075. Otherwise jump up to a 1200 for even more bottom end power. Adding more cc's with same stroke will give you tractor power...won't help top-end as much though. Bigger motors with nothing else changed will effectively bring rpm where power is made down the rpm scale some. Keep the carbs on the smaller side as that will give better throttle response also. Watch cam selection if you go that route. More lift is ok to a point but pay attention to the duration. More duration will effectively raise the rpm point where power is made and will take away some of the bottom-end power. Look for cams with more lift if wanted but with shorter duration numbers. Cams advertised for turbo's come to mind for bottom-end power over the bigger cams usually used for top end power. So...bigger bore, carbs on smaller side, cams with shorter duration. Remember a stock head can only move air for cams up to about .370 lift or so unless you have it ported, bigger cams won't help much anyway. Listen to Wireman when he mentions how he builds a street motor...he is doing it right if you want a strong street motor with good throttle response.

Mookachacka wrote:

Boostable wrote: Ok, got the motor off to machining, suspension parts are on the way, bike is stripped down and im ready to start fabing my mounts (when everything gets here)... In the meantime, I need to give my carbs some attention. So I need some advice...

Do I keep and rebuild the BS34's?
Do I pursue the 29's that I have a line on?
Or do I buy something else?

Basic specs of the build is 1075, 10.5:1CR, .418 lift cam, mild porting, 4 into 1, with Pods.

I know a lot of you guys have some real world experience in this area, so any advice would be appreciated.

Thanks in advance,

Jack

I'm thinking about doing something similar with my Z1000R but I'm still in "research mode" seeing how I got a hard time figuring out the gains of a 1075 or 1105 high comp wiseco kit and comparing that to what more I have to do to the engine to make the kit work as intended.

I've been looking at the RS34's seeing how they are 100$ cheeper then the Keihin CR's but I'm leaning more towards the CR's 29's or 31's at this stage.

Seeing how my riding style would probably never, or very seldom, take me past 100 mph I'm trying to figuring out the best way to gain performance in the low- to mid range willingly sacrificing some mph and pull at the top end.

I'll follow your progress with interest!

/Otto

just say no to the 1105 unless youre riding in alaska! :laugh:

Yeah the 1075cm3 seems the way to go if I see what ppl done to thair "street" machines, a norwigian guy on another forum had done the same to his Z1000R. And I guess it would recuire now maching other then boring the cylinder up to the right spec.

If one would go the 1075cm3 route, with a rack of 29's, fitting a new pair of cams (web cams #118 maybe?) would a port job be an aditional way to boost power or would this just be beneficially with some kind of valve job (or the correct cam?), maybe going up a size on the intake and exhaust valve? I'm trying to figuring out the best way to benefit the CR 29's + the wiseco 1075 (and the 4-1 kerker + k&n pods) as much as possible ang gaining performance where I'll mostly ride (0-75% or rpm range).

Sorry for asking to many question in a thread that I didn't start