Big bore GSXR engine

[dupersunc]

5 hours ago, Upshotknothole said:

I'll be taking a long hard realistic look at a lot of my spares and figure out what I can get rid of to help off set this build, and just to make more room. I'm already assuming this is going to be my most expensive GSXR build to date, and upgrades on other bikes are just gonna have to wait. I need to finish two other builds before I can even think about starting on this one. Good motivation to finish some stuff, I hope.

cough [PM brake set-up]/cough

[Upshotknothole]

45 minutes ago, clivegto said:

I ran a 1340 on the road with an extra large oil cooler it did jet hot when sat at traffic lights so I used to just turn it off. To get the best out of your 1371cc it really needs a big valve flowed head. 

I'll see if there's been any head work done to it when I get it, if not, that'll be high on the list of things to do. My stockish 750M already over heats worse than my naked 1100s in town. I'll start with an oversized cooler and I got a Yosh temp gauge that I'll hook up as well. If it over heats in town I just won't ride it in town on hot days. If it runs hot at speed I'll add a top end cooler.

APE is currently out of some of their top end stuff, but Kibblewhite looks like they have parts in stock. Big valves, flowed head, HD springs, lumpy cams, and 41 carbs, anything else?

[Upshotknothole]

14 minutes ago, dupersunc said:

cough [PM brake set-up]/cough

Don't worry, I haven't forgotten.

[baldrick]

14 hours ago, Upshotknothole said:

I've also been thinking about the durability of this engine being rode on the street. I've been told by a local guy that used to build GSXR engines that the 1340s will generate a lot of heat and will go through rings pretty fast. I'm assuming it would be the same with this. I am starting to think if the price is right on the whole engine, buy it, go through everything and see what's there, then put it on a shelf and later on send the cylinder block down to APE and get new pistons and sleeves for it in something a little more street friendly and lowering the compression down to something that doesn't require race gas. Really wish the guy that's selling the parts knew more about everything.

Curious what people would consider to be on the top end of being a reliable street bike as far as engine size goes. I know I've seen a lot of 1340s from back in the Street Fighter magazine days, but who knows how much those actually got ridden. It gets hot enough where I live that I'd plan on doing a top end cooler no matter what.

ive got a 1340 big block gsxr, and it isnt really a problem om the street as long as you keep away from drag cams and ridiculously high comptression etc. it wont go through rings, unless the bore clearance is miles out

it will overheat and id definiitely fit an extra head cooller if you put it in a streeet bike, and avoid citys , as it will overheat, especially without additional cooling.

citys are boring tho

Edited 10 hours ago by baldrick