750 to 850

[Stormstyles]

Will a 850 jug fit a 750 lower end? I have an 850 thats in good condition but shaft drive and my bike is a later 70s 750 that has a good lower end but the top end fins a few broke places. It was just a thought. Any help would be great.

[TheCafeKid]

You need the pistions from the 850 too. And you'll need to likely get new rings for them. A 79 850 jugs will drop right onto the 8v (pre 1980) 750 motor, but a 80 and up set of jugs will require a bit of grinding of the 750 cases to get them to fit right. Otherwise, from what ive read, its a bolt up swap.

[hampshirehog]

And you can pick what cams you like - 850 are a bit 'softer' than the 750 - they'll both fit.

[Stormstyles]

Ok do you know where i Might be able to find the literature that you read. Plus Which cams would be best for this swap. The 750? Ok Also where is a good place to buy parts for these things like the rings and gaskets?

[UncleMike]

So, this only works with the 8v motors?

Might be fun to do to the T...

[Stormstyles]

Oh is this a significant increase in HP and torque or not. Just wanting to know for the long term. Seeing this thing will take forever to build

[hampshirehog]

It will bump up your BHP and torque and is worth doing - better value in my book than going the Wiseco route. 750 cams will give you more top end, 850 cams will be a bit better at the bottom.

[SqDancerLynn1]

You have to use the 750 cam sprockets, do away with the 850 idler sprocket

[TheCafeKid]

It will bump up your BHP and torque and is worth doing - better value in my book than going the Wiseco route. 750 cams will give you more top end, 850 cams will be a bit better at the bottom.

Id have to double check this info. I know that at SOME POINT they re-timed the 850 cams for more bottom end, but I dont know WHEN (what model/year) they did this for sure. It is my understanding that the cam timing of the 79 850 was the same as the 750. All top end. I could be wrong however. The part numbers are the same for the heads, and sprockets.

[Nessism]

Cafe is right about the different cam timing, not sure how much difference it makes in the real world though.

[Stormstyles]

Would anybody be interesed in doing this swap for me? When it comes to suzuki's I am kinda out to lunch. I can do this but with what time is my problem LOL

[TheCafeKid]

First, where are you located. Second, Do you have the necessary 850 parts to do it with? Thirdly, are you paying to have it done??

[Stormstyles]

I am located in Knoxville tn. I have a complete 850 motor with no carbs and a complete 750 with carbs that I fired once. I will have to get the gaskets and any other necessary parts once its apart. I will Pay for it too LOL I dont expect anything for free.

[Stormstyles]

So nobody will do this?

[49er]

Id have to double check this info. I know that at SOME POINT they re-timed the 850 cams for more bottom end, but I dont know WHEN (what model/year) they did this for sure. It is my understanding that the cam timing of the 79 850 was the same as the 750. All top end. I could be wrong however. The part numbers are the same for the heads, and sprockets.

The 79' 850's cams were the same grind as the 79' GS1000. I believe that the timing was changed on later 850's by advancing the inlet opening.

I wouldn't consider the stock 850's as having all top end though. But, they certainly don't run out of puff until past the red line either, even with the airbox still attached!