XV750 Project

[jaseman]

Does anyone know if a xv750 engine will fit into xv400 (84)frame?
I have a very tidy xv400, witch is too slow, i am ready to sell it, but if i could find a bigger engine that would fit straight in, i would rather keep it. It looks exactly the same as 1983 XV750 but looking at the yamaha online parts catalog many of the part numbers are different. Cheers for any help. Cheers Jason.
p.s watching this project with interest!! Looks great. Are you keeping that exhaust? if not, want to sell it?

[crashe]

Does anyone know if a xv750 engine will fit into xv400 (84)frame?
I have a very tidy xv400, witch is too slow, i am ready to sell it, but if i could find a bigger engine that would fit straight in, i would rather keep it. It looks exactly the same as 1983 XV750 but looking at the yamaha online parts catalog many of the part numbers are different. Cheers for any help. Cheers Jason.
p.s watching this project with interest!! Looks great. Are you keeping that exhaust? if not, want to sell it?

I have sitting in my garage on LOAN a 1981 XV750..... you are most welcome to have a look at it to check out engine size... so that way you can see how it will go.

I do have my doubts of a XV750 engine fitting into the XV400 frame thou.

Im in west ak..


EDIT: UPDATE - I took the XV750 around and it is confirmed after measuring up and checking it out....... the 750 engine will NOT fit into the 400 frame.

[Conquiztador]

Does anyone know if a xv750 engine will fit into xv400 (84)frame?
I have a very tidy xv400, witch is too slow, i am ready to sell it, but if i could find a bigger engine that would fit straight in, i would rather keep it. It looks exactly the same as 1983 XV750 but looking at the yamaha online parts catalog many of the part numbers are different. Cheers for any help. Cheers Jason.
p.s watching this project with interest!! Looks great. Are you keeping that exhaust? if not, want to sell it?

Sorry, can not help re the motor swap. The exhaust will not stay. After she has VIN, WOF and Rego she will be customized as per the drawing in post 1. That is about 3 months away according to my plan... So if you still are looking for one then, just keep an eye on this thread and it will be clear when I am that far.

The carbies are now together. Tidy!! Motor is being polished. Sadly takes a fraction longer then planned. (Bloody work!!) But will get there this w/e.

Will post pics of motor and carbies when completed.

[Conquiztador]

Time. I really must stop sleeping then I would get everything done!!
But still on track to have her on the road for Xmas. 4 weeks to go so I will make it!! Stage one and two will be done by then!

Right, today I put everything else to the side and spent the day focusing on her. Completed the carbie job. Did some adjustments and syncronisation. (Twin carbies) These carbies have a linkage that is supposed to make the throttle on both to open at same time. The throttle cable connects to the l/h carbie and the linkage does the right. But the linkage was not working that well. Some wear had made the r/h throttle open later. So I dismantled and fitted some thin washers to make it all tight. Then I carefully filed the track that the linkage wheel runs in (see pic) and made the track tighter by carefully giving it a couple of taps. Test that the linkage runs smoothly, a little more filing and then assemble. Now I was able to get both butterflies to open at exactly the same time by adjusting the syncronising screw. Brilliant!!

The diaphragm in the l/h carbie (SU carbies) at top of the vacuum piston had a few holes in it from wear. Nothing major, but could cause this side to not open as fast as the r/h. As I did not have a new diaphragm I repaired it by using a tyre puncture kit. A couple of small patches and all well. Will order two new diaphragms later when I do the customising, but the repair will do the trick until then.

OK, carbies all done. Spent what was left of the daylight cleaning the whole bike and focusing on the motor. Always found that you will see things you would not othervise have noticed when you do a thorough cleaning. But did not find anything major. Some nuts and bolts need tightening and a couple are missing. But my box of "good to have bits" had just the ones waiting for me.

So now she is happily drying over the night. Then tomorrow I will spend some more time polishing the motor in the crannies where I did not get in when washing. Then the carbies go back on and with some luck I can have a ride tomorrow... But I have had the riding plans for some weeks now. And I should really be working on the 2008 budget for work...

OK, if it is a bad weather day I do the budgets, if it is sunny I focus on her (I am in HB remember...). So the chances that I will start her is high.

Will keep U guys posted.