Project "walrus" Yam XS 750

[Ryan Stecken]

Thanks tim!
I will probably measure if my stock springs are saggy...they dp feel softer than my RD forks,but they have spacers inside in order to bear with the light front wheel :-)

Totally different question:ran across a guy who sells parts of his 850.
I think I will get the CDI box,since I want a spare box and probably convert my stock points to the 850 CDI.
Which parts will I need to get from the 850 to have a complete CDI ignition?

I guess:
-CDI box with cable string and plug
-flywheel?

Little bit lost here.

Next week my Yambits package wilö arrove with a galore of parts...cant wait for workshop time :-)



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[XS750AU]

Hi Ryan
Yes you need the CDI box and then as you sit on the bike, everything under the left hand cover. That would include the pickup plate and rotor assembly including the M8 bolt. Basically everything down to the bare crank end.
Is there an oil cooler and adaptor plate on it? I would be interested - only if you don't want it?
Cheers
Tim

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[Ryan Stecken]

Hi Tim!

Thanks!

For the oil cooler:Since my model is a stock 750 I guess I will need oil cooler,adapter plates, and the adapter (number 11 in daigram) for the oil cooler dont I?

For the CDI system:Am I right that I need: 5,7,8,10,11,6,9,15,17,16...the base plate does not seem to have a part number on cmsnl...

[XS750AU]

Hi Ryan
Yes correct on the CDI = all parts you listed. The base plate I was talking about is #5.
On the oil cooler there are more parts = 11,17, 18, 19, 20, 25, 30 & 31 if they are there. 11 & 17 are the minimum to be useful.
While you are at it, didn't you have a charging problem? You should check the coils under the side cover on the opposite side to the ignition, do a quick check with a multimeter as per the previous post. If they are not open circuit then you are a step ahead. If there is a rectifier/regulator it would also be worth grabbing. From the photo the ignition coils have gone!
If you are really keen then the head would give you a step up in compression ratio from 8.5 to 9.5 and better cams - but how far do you go!!!
Good luck
Tim

[Ryan Stecken]

Hi Ryan
Yes correct on the CDI = all parts you listed. The base plate I was talking about is #5.
On the oil cooler there are more parts = 11,17, 18, 19, 20, 25, 30 & 31 if they are there. 11 & 17 are the minimum to be useful.
While you are at it, didn't you have a charging problem? You should check the coils under the side cover on the opposite side to the ignition, do a quick check with a multimeter as per the previous post. If they are not open circuit then you are a step ahead. If there is a rectifier/regulator it would also be worth grabbing. From the photo the ignition coils have gone!
If you are really keen then the head would give you a step up in compression ratio from 8.5 to 9.5 and better cams - but how far do you go!!!
Good luck
Tim

I´m thinking about buying the WHOLE 850 motor and putting it into my 750 frame, then I will have no need to mess around with my 750 to 850 conversion...

does the 850 motor fit into the 750 frame?

So I guess I will buy from this guy (if he makes me a reasonable offer):

-850 motor (with all the oil cooling stuff attached)
-oil cooler
-ignition box
-loom if in good condition (is it hard to modify the 750 stock loom to 850 cdi specs?)

the guy said that the motor ran till the end without any hickups,what should i check when I visit the guy?

thanks in advance!

[XS750AU]

Ryan
Getting the whole motor would be the most logical option, if the price is OK and you have enough space. You have to assume the motor is dead and needs to be rebuilt as there is no way to reliably test it as it is. I don't know of many people that just start striping their bike out if it is perfectly OK.You could bore it out to 896!!!
Good luck.
Tim

[Ryan Stecken]

Ryan
Getting the whole motor would be the most logical option, if the price is OK and you have enough space. You have to assume the motor is dead and needs to be rebuilt as there is no way to reliably test it as it is. I don't know of many people that just start striping their bike out if it is perfectly OK.You could bore it out to 896!!!
Good luck.
Tim

thats true!you cannot trust noone :-) but since both of my 750 motor would need a rebuild too, i wouldnt lose much....

does the 850 go into the 750 frame with no adaptations (kardan and frame mounts) or would I need to modify my frame?
is there a way to turn the engine over by hand (maybe when I take the left hand ignition roto with a wrench)?
Do the coils match the 750 ones too?

cheers and thanks man you are a great help!

[XS750AU]

Hi Ryan
Yes if you take the LH cover off there is a M21 nut you could use to try and turn it over. It should turn easily if it is ok, don't force it.
On my 2D the front mounts are incorporated into the frame. On the later SE the front mounts are made up using 2 plates that you remove = easier to get motor out. Engines have exactly the same mounting points, therefore interchangable.
The 850 is a better motor for you to start with.
Cheers
Tim

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[Ryan Stecken]

Hi Ryan
Yes if you take the LH cover off there is a M21 nut you could use to try and turn it over. It should turn easily if it is ok, don't force it.
On my 2D the front mounts are incorporated into the frame. On the later SE the front mounts are made up using 2 plates that you remove = easier to get motor out. Engines have exactly the same mounting points, therefore interchangable.
The 850 is a better motor for you to start with.
Cheers
Tim

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Thanks Tim!

I will try that this saturday.I will have a good look down the spark plug holes if there´s rust in the cylinders too...since we need to remove the exhaust too I will have a look into the exhaust outlets.

Should I go for the 850 loom too or is the modification for the stock 750 loom an easy task?

Just to make sure.Sorry to ask again man, will the 850 fit the 750 frame?


cheers!

[XS750AU]

Hi Ryan
I have never worked on an 850 bike, so I don't have personal experience. There are numerous posts where people have transplanted 850s into 750 frames, so I believe it is easy enough.
Body harness is all dependant on condition, the photo did not look like the wreck had been stored well?
Good luck
Tim