Topic: 1973 CB 750 exhaust

[Slow2]

Man am I glad I passed on that 550. Found the 750 I’ve been looking for at a fair price and it’s close to me. Only large ticket item will be an aftermarket stock exhaust system. I see that David Silvers has them in stock and Busso is taking orders. The Busso sight is hard to navigate because of the Italian. Which one do y’all recommend? The one thing that makes me shake my head is thinking about all the perfectly good factory systems I chunked in the garbage!! I never ran stock more than 500 miles. Dumb. Anyway, help and comments greatly appreciated!!! Oh yeah, picking the bike up tomorrow if it’s not storming!!!
Ed

[69cb750]

I see that David Silvers has them in stock and Busso is taking orders.

The Busso sight is hard to navigate because of the Italian. Which one do y’all recommend?
Silvers sells the same pipes Yamiya used to sell, they are very nice.

I ordered a set of Busso pipes, have not arrived, everyone reports Busso makes nice parts.
Order from Silvers, I will report when Busso ships.

The one thing that makes me shake my head is thinking about all the perfectly good factory systems I chunked in the garbage!!

Lots of original exhaust pipes were discarded, a few survive in garages.

[MauiK3]

ultimate value of your work, if you plan to sell at some point, is how stock it is. Busso is really great stuff I assume
stock repops will be worth more.
one thing we have not seen reported here about Busso exhaust is the effect on carb tuning. I'm thinking they won't present a problem but who know?
stock intake is more important for carb tuning

[beemerbum]

+1 on the DSS repops

[Doobie]

I looked on the DSS site and did not see repops listed. Does anyone have a link? Thanks.

[RAFster122s]

If it is gonna be a keeper and rider, then I would put a set of Busso pipes on it and be happy saving the coin for a rainy day...

[beemerbum]

Seems Slow2 said DSS had them in stock. I did not look myself

[Doobie]

Seems Slow2 said DSS had them in stock. I did not look myself

Yes, I know. I looked and did not see them listed. I've since learned that DSS has a US and a UK website and they are different. Pipes are on UK site only.

[Doobie]

I've been looking for a complete exhaust for my CB750K2 and the options I found were OEM and replicas from Busso, Yamiya and DSS.

Saw two new OEM sets on eBay, each for $4K, so option 1 was off the table.
I've seen the Yamiya pipes firsthand and would have bought those, if only they weren't out of stock and no firm time frame for when they'll be available.

I heard good comments about the Busso and thought I would try those, but I wasn't sure from their website what parts the system included, and they only answered one of two emails I sent them. Their English is as good as my Italian, which I don't understand.

Then, I read here that DSS had some in stock and since I've done business with them before and trust them, I ordered them a couple of days ago. $1600 approximately, with shipping.

If anyone is interested, I can post photos/observations when they arrive. The morning of the day I bought them, they had 4 sets in stock. Later that day when I decided to fork over the dough, there was only one set left, which is what I bought.

[MauiK3]

you won't be disappointed.

[leovich]

I've been looking for a complete exhaust for my CB750K2 and the options I found were OEM and replicas from Busso, Yamiya and DSS.

Saw two new OEM sets on eBay, each for $4K, so option 1 was off the table.
I've seen the Yamiya pipes firsthand and would have bought those, if only they weren't out of stock and no firm time frame for when they'll be available.

I heard good comments about the Busso and thought I would try those, but I wasn't sure from their website what parts the system included, and they only answered one of two emails I sent them. Their English is as good as my Italian, which I don't understand.

Then, I read here that DSS had some in stock and since I've done business with them before and trust them, I ordered them a couple of days ago. $1600 approximately, with shipping.

If anyone is interested, I can post photos/observations when they arrive. The morning of the day I bought them, they had 4 sets in stock. Later that day when I decided to fork over the dough, there was only one set left, which is what I bought.

I bought me too the exhaust on David Silver, it’s the yamiya with yamiya box and they’re prefect

[Slow2]

Busso sent me an email today stating they were extending the sale on the exhaust systems through Christmas. I would love to be able to get a set but I can’t for the life of me figure out how to purchase them!!! I can’t read Italian!! I know there are several here that have ordered from Busso. Will you please explain to me how you did it? Thanks!!!
Ed

[robvangulik]

You can choose for 'english' in the right upper corner of the site, for the rest use the shopping cart as usual...
https://www.bussostore.com/en

[Stev-o]

On sale for approx $900, good deal!   Not sure about shipping?

https://www.bussostore.com/en/collections/honda/products/kit-silenziatori-honda-replica-originali-cb750k0k1k2k3k4k5k6-four?variant=43879623622869

[Shtonecb500]

Codice Marmitta - muffler code - choose 300 or 341 pipes.
 1 set of pipes will already be selected, if you want another set then click on the plus or minus….otherwise look to the bottom where it says

aggiungi al carrello - add to cart

after that a box to the right should appear asking you how you want to pay, and empty box that says Istruzioni speciali per il venditore - "special instructions for seller" if you want to leave a note or special request fo them

below that you will see the total amount in euro, and below that in italian it says
Spedizione, tasse e sconti verranno calcolati al momento del pagamento which is " Shipping, taxes and discounts will be calculated at checkout"

the box you need to check says :

Ho letto e sono d'accordo con le Condizioni d'Acquisto, Condizioni di consegna, Politiche dei Rimborsi - I have read and agree with the Purchase Conditions, Delivery Conditions, Refund Policies

check that and below it says procedere al checkout  - proceed to checkout - click this if you are just paying with a credit card, otherwise utitlize the buttons for apple pay or paypayl  if that is your preferred method.

the next page is where you fill in your contact info, payment and delivery info, at the top it will again provide options for alternate payment methods outside of entering your credit card…

recapiti: deliver
that box below it says : email o numero di telefono cellulare - email or mobile phone number

below that is a box you can check that says Inviami email con notizie e offerte - send me emails with news and offers

next box - Indirizzo di spedizione - shipping address
the next box is a drop down and “stati uniti’ should be preselected  for united states.
the next two boxes are first and last name, cognomen means “last”

the next line azienda facoltativo - option company
next line - indrizzo - address
next line is partita iva - vat number
the three boxes under that are city, state, and zip code, those should automatically fill in for you once you enter your address in the above location.
next line - telefono - phone number
there is a box you can check that says Salva questi dati per la prossima volta - save this data for next time

the little blue arrow on the left that says torna al Carrillo means "back to cart "
the blue box on the bottom right means “off to shipment”

on the next page it should have a grand total at the top, your contact info and address, then below, the standard shipping method of 150 euro should already be selected for you

Modalità di spedizione - shipping methods

at the bottom the left arrow says torna alle informazioni - back to information
and on the right the blue box says vai al pagmamento - go to payment

on this page  under the info  you will see a box that says Condice sconto - discount code

then next box says Pagamento - payment

Tutte le transazioni sono sicure e criptate- "all transactions are secure and encrypted"

Carta di credito - credit card should be selected for you
next line says numero carta - credit card number
next line nome titolare della carta - cardholder name
next line data di scadenza - expiration date
next box codice di sicurezza - security code

below the PayPal box it says Indirizzo di fatturazione
Seleziona l'indirizzo corrispondente alla tua carta o metodo di pagamento. - billing address select the address corresponding to your card payment  method

the first bubble to check says Uguale all'indirizzo di spedizione - same as shipping address
the second bubble says Utilizza un indirizzo diverso per la fatturazione - please use a different address for billing - at that point it will prompt you to fill in new fields for the new address information

if you just continue, there is the back arrow on the bottom left or the blue box on the right that says revedi l’ordine - "review order"


I use goggle translate and just copy and paste the phrase, if its text i cant copt and paste then i type it in there.https://www.google.com/search?q=google+translate+italian+to+english&source=hp&ei=i72TY9y-GKakptQPw6O_4Ag&iflsig=AJiK0e8AAAAAY5PLm7MbVKUi_9OD1oCob5aIseeuEHlF&oq=google+translate+tiali&gs_lcp=Cgdnd3Mtd2l6EAEYADIMCAAQgAQQDRBGEP8BMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANMgcIABCABBANOhEILhCABBCxAxCDARDHARDRAzoLCAAQgAQQsQMQgwE6CAgAELEDEIMBOgUIABCABDoICAAQgAQQsQM6DggAEIAEELEDEIMBEMkDOg0IABCABBCxAxCDARAKOgcIABCABBAKOgoIABCABBCxAxAKOggIABAWEB4QCjoGCAAQFhAeOggIABAWEB4QDzoKCAAQFhAeEA8QCjoFCAAQhgNQAFjRP2CpTWgGcAB4AIABY4gB3Q2SAQIyNpgBAKABAQ&sclient=gws-wiz

[Slow2]

Wow!! That took you a fair amount of time!! I greatly appreciate it!!

Ed

[Slow2]

Ok, I need some advice. I’ve got to choose either the 300 or 341 exhaust. I’m picking the bike up Monday. It’s a K5 with an unknown brand four in to one exhaust. The original air box is still in place. The owner doesn’t know if it’s been rejetted. I would assume it has because it idles and accelerates great. I know the bike originally had 341’s but I would like the more open 300’s as long as they will fit without problems and don’t cause major headaches with rejetting. Thoughts? Opinions? Experience? Thanks in advance!!

Ed

[BenelliSEI]

I’d prefer to keep it stock on the 341’s. BUT, it’s your bike! Buy the noisier ones if you want. They will be the same effort to fit.

[MauiK3]

My K3 has Yamiya "no number" pipes with the baffles installed.
They sound great and were easy to set up.

[Maltboy]

If ordering Busso pipes, use code WelcomeBack for an additional $30 euro discount. Chase rewards is also giving 5% cash back on PayPal purchases. That's $1017 USD shipped after the two discounts.

[PeWe]

I think the "300" is same as the Yamiya no numbers as I have.
My K2 has them now with stock K6 carbs and air box.
Baffles (diffusers) are in without the padding.
Nice sound.


Tried the old stock jetting first:
Pilot 40
Needle: Middle
Main jet:105.
Too lean

Raised needles 1 step to 4th notch from top.
Main jet:115.
Air screws 1 turn out. Maybe -1/8 from 1 turn.

My other bike has used these pipes with 836, ported head and hotter cam which worked fine.
341 pipes too restrictive.
Another thing if you build a pure stocker.

[seanbarney41]

Re-jetting is not always required to run a 4-1. 

[Stev-o]

Re-jetting is not always required to run a 4-1. 

I agree with Sean, dont just automatically assume that the jetting has been changed with an aftermarket system.

My "big bang" K4 came to me with aftermarket 4 into 2 exhaust, manufactured by Action Four.
After the motor rebuild, I installed OEM 341's and the bike still ran great, no carb work required. Heck, the bike even ran with a 3" hole in the case!!