1978 gs750 questions

[Anonymous]

I have a 1978 gs750 that needs engine work. I am boring it out to an 850 and know that I need to rejet. Does anyone have any idea of what jet sizes I need to go with after the mod is done? Any information would be helpful.

 

[Anonymous]

I have a 77 and it is not bored out, but run velocity stacks and open header. I went from stock (97 ?) to 122's. Initially, I would think you would keep close to stock unless you do some air/exhaust mods with the carbs, cams and/or exhaust.

You can call Dynojet and get the DJ series jets for a pretty good price. I have a post somewhere else on here with the actual prices.

Let us know how it turns out.

Phil

 

[KW]

I'ff you are just going from 750 to 850 then you shouldn't need to re-jet, as both bikes have roughly the same jet sizes.

 

[Anonymous]

I don't mean to be an ass, but why don't you just get a 1000? They're just bored-out 750s from factory. I can see why you wouldn't just get a stock 850 as they are only cruiser style and maybe you want the standard style. But if you want the same style and all, with more power, just trade up to a 1000. It's probably a heck of a lot less work.

My two cents. Best of luck!

Michael

 

[KW]

Maybe a lot less work but not as much fun to do! :wink:

 

[Anonymous]

I have actually just graduated from college and am still searching for a job. I have very little money and got the bike and a second engine for $450. It is a lot cheaper for me to just play with what I have and both engines are out of spec so they need to be rebuilt. I am not really looking for more power or anything just trying to get myself a good reliable bike to ride to and from work. Thanks for the input from everyone.

 

[Anonymous]

I have actually just graduated from college and am still searching for a job. I have very little money and got the bike and a second engine for $450. It is a lot cheaper for me to just play with what I have and both engines are out of spec so they need to be rebuilt. I am not really looking for more power or anything just trying to get myself a good reliable bike to ride to and from work. Thanks for the input from everyone.

Yes, I can sympathize with that. I'm one year out and I just got 90% laid off.

I still don't know if a bore kit is really the best thing for you but you didn't ask, did ya? :wink:

Best of luck, welcome to the site!

Michael

 

[Anonymous]

Isnt the 1000 a bit heavier then the 750 and the the 1000 a bit longer too? I with the extra torque and hp from the overbore that 750 should be quite a bit faster off the blocks then a standard 750 plus still be able to handle relatively quick. Plus depending on the 850 conversion, you can up the compression ratio too so there are definate advantages to just overboring an engine. Plus as he said..it can be cheaper and fun!