Motor rebuild

I did mine this summer with the Wiseco 1075cc 10.25:1 compression kit and I am running the stock 26mm carbs with the stock KZ1000a camshaft.
I had the head redone at the same time with a couple new valves and all that rot.
My sprocket complement is 15T/35T. I tried 14T and 35T for fun and it was outrageous... back to 15T/35T now.
It runs better then when new but it's not a drag bike.... I'm guessing at around 85 to 90 horsepower from the rebuild.
Which means a well tuned 600cc-750cc crotch rocket will still blow me off!! Ha ha...

The stock KZ 1000 was boasting of 91 BHP. The Z1 had 84 BHP at the crank shaft.
Steve

I'd be interested in a horsepower figure for just the 1075 Wiseco kit with 10.25:1 pistons, pretty much everything else stock. My guess would be the extra compression and capacity should be good for about 10 hp, but I've never seen anything quoted anywhere regarding the increase in power. I know cams etc. will give you more, but firstly I don't think I need more power and secondly I'm not interested in pushing the powerband further up the rpm range.

I haven't been able to ride mine far, and not in anger so far as I had work to do with things like a new chain, tires, fork seals and brakes to get sorted before really opening up, but my impression so far is with the 1075 kit, 28mm carbs, V&H exhaust is that it has quite a bit more go than a stock bike. I won't know until I get my carbs back on with the bigger pilot jets because they were causing a bit of hesitation on the bottom end which was exaggerating the power ban, but I'm wondering if someone fitted hotter cams at some point it does hit about 4k rpm and then really take off.

davido wrote: I had my CSR rebored and Wiseco 1075 pistons fitted. As far as I know,the cams stayed the same. Valves lapped ,new stem seals and a new cam chain.That was about it. Still not running yet as I have to fiinish building the rest of the bike. My big concern with the motor is where to start with rejetting the carbs.

I would leave your carbs with whatever jets you had originally, assuming it was running right, until you get the bike running and can see how it performs. With a carburetor it will "adjust" itself to some extent for the extra cc's, if you suck more air in, it will put more gas in in proportion. I run the same engine kit but have VM carbs so my settings are no help to you because you have CV carbs?. It might be a little different there because the engine changes might effect your vacuum levels, I'm not sure, but the correct jets for my bike don't seem to be really much different, if at all, from what I'd expect to run, with a 4-1 exhaust and a little freer flowing intake on a stock motor.

redhawk4 wrote:

davido wrote: I had my CSR rebored and Wiseco 1075 pistons fitted. As far as I know,the cams stayed the same. Valves lapped ,new stem seals and a new cam chain.That was about it. Still not running yet as I have to fiinish building the rest of the bike. My big concern with the motor is where to start with rejetting the carbs.

I would leave your carbs with whatever jets you had originally, assuming it was running right, until you get the bike running and can see how it performs. With a carburetor it will "adjust" itself to some extent for the extra cc's, if you suck more air in, it will put more gas in in proportion. I run the same engine kit but have VM carbs so my settings are no help to you because you have CV carbs?. It might be a little different there because the engine changes might effect your vacuum levels, I'm not sure, but the correct jets for my bike don't seem to be really much different, if at all, from what I'd expect to run, with a 4-1 exhaust and a little freer flowing intake on a stock motor.

Thanks for the advice. The carbs are a bit of a dark art to me. Im not ready for them yet so Im not looking into them too much.When the time comes to sort them,I know that this is the place to ask whats what. Im going to have plenty of questions.

There must be HP figures somewhere.Itll be important to some people. Though I think that there are so many variables.How many people just fit a big bore kit? Most would go a bit further. Different cams,K&Ns, at least a 4into1. It would be difficult to figure out. If someones really into it, a run on the dyno would be the best bet,I suppose.

Is any of this useful to you dberg?

dberg wrote: Hey everybody!
I am going to beg for some help. I would like to put a 1075 kit in my 79 ltd 1000 so I was wondering if somebody could help me find parts and give me advice on cam size and anything else I might need to complete this project. This bike has been sitting with a broken ring for about 5 years. I would like to be able to take to the strip and have some fun when it is done.

Help would be great!!
Thanks
Dan

What is the goal you are trying to achieve beyond getting the bike back running? The 1075 Wiseco kit with 10.25:1 compression based on my bike seems to give some extra go. To really boost power you will want cams, but hotter cams will shift your powerband northwards and you will lose bottom end power, it's a trade off as to how far you want to go. A really powerful setup probably won't idle nicely and will be unpleasant to ride around town or when you just want to cruise along admiring the scenery. So you have to have an idea of what you intend to achieve before choosing what modifications to make, taking even a stock bike to the strip can be fun, but if you are doing anything serious then you are looking at modifications that aren't going to leave you with a weekend rider as well.

I have built plenty of 1075s that have very good manner on the street and will fly its all in the combinaton , machine work and how carefully assembled.

DFIGPZ wrote: I have built plenty of 1075s that have very good manner on the street and will fly its all in the combinaton , machine work and how carefully assembled.

What sort of cams would you suggest above stock that you can you get away with without losing bottom end power/rideability? what sort of power increases are we looking at?

DFIGPZ wrote: I have built plenty of 1075s that have very good manner on the street and will fly its all in the combinaton , machine work and how carefully assembled.

That's true, I have a 1075 kit in my MKII motor, RS 34's Dyna 2000 with Dyna coils & wires, I had the head ported & am running stock cams
It's more than enough speed & power thru the spectrum, I also went with 15/ 32 gearing because I do a lot of highway driving & wanted to keep the R's down , & it still has plenty of pull
Pete

redhawk4 wrote:

DFIGPZ wrote: I have built plenty of 1075s that have very good manner on the street and will fly its all in the combinaton , machine work and how carefully assembled.

What sort of cams would you suggest above stock that you can you get away with without losing bottom end power/rideability? what sort of power increases are we looking at?

"Drop in cams" are a good buy. I have the 1X Andrews cams. Supposed to improve the low end without loosing the mid and top end. With the stock 8.5/1 pistons, it had good power. The 10.25/1 Wiseco's made a noticeable difference. With the 33's I'm getting as much as this set up will allow. With Bruce's 1075 kit, stock cams and 26 mm carbs, he is getting decent power. My 1015 vs his 1075 would probably be rider against rider at that point.
Steve

do not for get Z1 crank wich drops it to 897 cc's at 7 to 1 CR

Stow it
Steve