Can you turbo charge an 81 XJ750 seca YICS motor?

Just curious if anyone know anything about turbocharging an seca 750?

 

do you know anything about turbos? that would be a huge modification. You would prob have to do all the calculations yourself about how much torque and how much stress the different parts can handle. (drive shaft mainly in your case) As well you would need to rejet and rebalance your engine. and where would you even fit the turbo on the bike?

I dont mean to sound condescending, I'm just honestly asking.

 

I'm more of an all motor kind of guy. In all actuality I don't know ish about turbos or motorcycles for that matter that's why I asked. But I'm building a mini sand rail (you could call it) with a 750 yics motor and I thought it would be fun to turbo it. So I set out to see what people knew about it on here. Thanks for your time I appreciate your input.

 

if you want the effect of the turbo try using pod filters, it accomplishes the same thing if you tune your engine correctly, but to a lesser extent. a turbo basically increases airflow and compression in the engine.

 

Here's one that was done to a 650. http://www.xjbikes.com/Forums/viewtopic ... build.html

I'd imagine the 750 would go about the same way. Space would be easier to come by on a sand rail.

 

since you're ditching parts and working around with other ish I bet you could get a few bucks for the carbs and go FI with megasquirt. Turbo THAT and you can dial in whatever tuning you like. Once the hardware is in, mapping is marginally more complicated than the webternetting you're doing right now. Dunno if megasquirt has it or if it's just some of the other companies doing FI kits but there is also readily available learning units that'll basically do the tuning for you as you run it.

If you're scrap yarding I might suggest one of the two twin turbos from a volvo or something.

 

Awesome I like where you guys are going with this. So this megasquirt makes FI kits for the 750 motor? I might just go with an FI kit the horse power gain from that would prob take care of my lead foot syndrome. I really just want to go fast. What are some options I have to build up the motor? it seems hard to find any kind of performance/ aftermarket stuff for these bikes

 

they make FI kits period. less motor just needs a smaller squirt. They do microsquirt for stuff all the way down to RC cars.

 

Hell yeah that's awesome. I sent them an email I hope they get back to me today. If the price is decent Ill let those carbs go quick!

 

As far as building up the engine goes...doesnt seem like a easy road to take.
You might find performance pistons, but the rest is a crap shoot.
I have not been able to find a replacement upgraded cams, valves either.
Who knows the power increase will prob be negligable.
Maybe Im looking in the wrong places, but cost will also be a factor for my searches.
Fuel and Air seem to be the variables to play with to increase power and keep mod cost lower.

If you do turbo the bike, I think you might need to beef up the internals

 

I think you're barking up the wrong tree with this motor. If you want a real high performance motor, first, I'd bypass something as small as a 750 unless it was a GSXR or something else that there is a lot of performance parts for. Second, I'd go for at least a 1000cc engine for an easy 100hp right off the bat. Then, depending on which engine you choose, hot-rod that to get the extra ponies. Any KZ 900, 1000, 1100 or GS1000,1100,1150 motor has a TON of aftermarket support that will let you build a truly monster engine if your wallet permits. This is still going the cheap(ish) route, since you can find complete rolling bikes for a grand or less that need work, and Ebay is a great source for hop-up parts. If you have more money, there is the GSXR/Hayabusa/ZX11-12 motor route, which would certainly be more than enough, I would think.

With the number of blown Maxim X bottom ends that have been reported, I don't think the XJ750 motor is one to take a whole lot of performance upgrades in stride.

 

well thanks for the heads up everybody. I dont think that turbocharging this motor is an easy feat. So Im just going to try and get a EFI system and run better coils and spark plugs etc. I might go with a bigger bore if I can but if not I wont worry about it to much. Also to mac I've looked around for bigger motors because of all the aftermarket stuff but I got two 750's for free that ran so it's just for fun right now but if I decide it's not fast enough I'm for sure going that route. I'm trying to keep this build under 1k so we'll see what happens. Ill keep everybody posted.

 

No use in reinventing the wheel.

Here's a nice write up on injecting a 750.

Looks like the pictures and most of the links are gone, but it should help.

http://www.xjbikes.com/Forums/viewtopic ... art=0.html

Good Luck
ab

 

jon.p, are you looking to go fast or to go quick?

You should be looking at something over a liter to have the torque to drive a sand rail anyway. Like maybe a 1200 cc VW engine. MUCH cheaper, parts readily available, plentiful aftermarket parts, and a lot better performance. Transaxles, air cleaners etc. already exist for this application.

Sell your 750's and get a VW engine for a start. THEN work your way up.