1429 Big Bore Question

[Commuta_Busa]

wait a second.. this guy has a built 1429 and isn't doing anything to adjust the fuel compensation?!?!? ??? Has he done something to bump the fuel pressure? I wouldn't suggest running an engine like this without first getting a proper baseline tune on a dyno. A 1429 or any other built motor will have different fuel requirements compared to a stocker.

Commuta_Busa, yeah i could imagine the flight is a killer. Spoke to owner tonight, he will get the number on the ECM to me then will forward to you. Looking at driving to go test ride bike next weekend ( Pity its over 1226 miles there and back ). The bike is not fitted with power commander so need to do some home work about which PC to order and have the bike tuned for sea level should i buy it. Just worried should it blow up or implode then wont have the cash to fix it. Parts and labour here is like house prices, OVERPRICED.

 

[SABUSABOY]

The more i think about this the more it is putting me off buying this bike, plus i dont want to buy it and something goes wrong with it and affects my friendship with the seller.

 

[Commuta_Busa]

I don't mean to discourage you from the sale. In the least you should really have some in depth conversations with the owner.

 

[SABUSABOY]

I think best is to go ride it, go speak to the guy who built the engine and see what is done to it, then decide.

 

[Commuta_Busa]

+1 since he's also your friend he should be honest with you about things.

I think best is to go ride it, go speak to the guy who built the engine and see what is done to it, then decide.

 

[SABUSABOY]

Commuta_Busa, if no pc fitted, and it has 1429 fitted, yoshi cams, degreed and gasflowed head with yoshi headers and Arata End can, small air box mod and TRE. If nothing was altered on fuel pressure side and no timing changes and no PC, why does it run so strong. Could the fact that it is running at 1,753 m (5,751 ft) above sea level mean it has less air pressure meaning less air causing it to run rich with normal fuel pressure thus saving the motor. I am so put off buying it right now.

 

[Commuta_Busa]

That's not reallt the case. The ECM compensates for atmospheric pressure so on a bone stock bike when you are running it at higher elevations the ecm is telling the injectors to flow less fuel than at sea level.

No matter what the elevation is a change in engine size, different cams, head work, exhaust system, and intake system requires adjutments to the fuel map to run efficiently.

 

[SABUSABOY]

Thanks, i will go test ride the bike, speak to the guy who built the engine and then come chat again, if i decide to buy the bike after we have spoken then will offer him 10 grand less on asking price as it will cost me around that to buy a PC and have it trailered to Cape Town so they can install PC and dyno bike for me.

 

[SABUSABOY]

Sorry about all the questions, but i am still new to modding bikes, can you advise me on any books i can buy that will help in getting information bikes and tuning bike engines.

 

[Commuta_Busa]

Almost everyone on the site is here to help each other out. To expand our knowledge, share experiences, and to help others any way possible.

The best source I use for books are the ones published through the SAE. These aren't hayabusa specific but they do have books on tunning EFI systems, etc.
SAE International

Even non-members can purchase most any book and/or papers just at a higher fee. You can gleam some knowledge by simply reading the busa service manual to start. It explains at a high level how the fuel and ignition systems function.

Just ask questions and read some posts that interest you and you'll gain alot of knowledge. Of course since it's the net there are plenty of times that you'll get 50 different answers to the same question. This comes down to personal preferences and other things as well. Always take things with a grain of salt. Over time you'll figure out on your own which sources will provide value added information for you.

 

[SABUSABOY]

Thanks for the advice, will keep you posted.

 

[Spkrdctr]

If you have no money to keep the bike up, then you are buying way over your head. You are buying a full on custom built motor with really no knowldege at all on how to take care of it, and have no cash to fix it when something goes wrong. You would be MUCH better off with a stock bike that has tons of parts for it and you can get fixed anywhere. Then when you get a lot more cash available, then look at a custom motor. Till then save up the money. Having a bike sitting there and you can't fix it is crazy. Usually that is when they sell dirt cheap cause they are not running. You could lose your shirt......

 

[GoldenChild]

Thanks, i will go test ride the bike, speak to the guy who built the engine and then come chat again, if i decide to buy the bike after we have spoken then will offer him 10 grand less on asking price as it will cost me around that to buy a PC and have it trailered to Cape Town so they can install PC and dyno bike for me.

Bro save yourself the gas and time,the phone and email is way faster..

send or call builder and ask what he did 1200+ miles to buy nothing is a long ways to go..

 

[ogre]

you really need to contact the builder asap man. before heading up there at all.

 

[SABUSABOY]

Thanks guys, but i have leave and dont pay for fuel and car so dont mind driving, plus think riding the bike will give me a better feeling and talk to the Builder of the engine to see what all has been, plus the tuner who had it on the dyno.
Spkrdctr, i understand your point, but i already have a standard bike and going to purchase 2 more, one all motor and one turbo, because thats my dream to own them. Its not that i would not afford to do the engine over should something happen to it, but more that it will take time to redo. Life in Africa is a hell of a lot more expensive than you think. But i will take your advice and should i buy the bike it will not be before having a lot of discussions with members like yourself and people who know what they are talking about. Will keep you guys posted on further developments.