VF750f air box question

Hi everyone! Just joined not long ago after purchasing a 1984 VF750f.

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The bike is in great shape, with 34k miles. This past weekend, I decided to have a look at why I had such an intake roar and found out that the previous owner had chopped up the airbox and removed the intake horns which pull in cold air from front fairing rather than the hot air from behind the radiator. The airbox has been cut up and is broken in several places and beyond repair. So... to buy a new one. I found a few on ebay but none of them hair the intake horns. With the exception of a vf1000f air box which seems to be all there. My question is, can I use a vf1000f air box in place of the vf750f air box.

Another question - The first thing I thought about doing for the bike was to get the oil mod on. But it appears that there was either a factory oil mod already in place, or a dealer installed one. Here is a pic.

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Sorry its so low res. Cell phone. : there is an oil tube that comes from the rear of the motor and then goes up and feeds all 4 heads. The tube was anodized black to match the engine.

Thanks again for your help. :-)

First off, welcome, and congrats!

Some jet kits require drilling of the air box, you should check to see if your bike has been jetted. Also, that oil line is the factory oil line. The problem is that there isn't enough pressure at that tap location to get sufficient oil to the heads at low rpm. Most of the mod kits bring the oil up from the bottom of the motor, where there's more pressure.

Good luck getting it sorted out!

Thank you Seb, btw... been reading your rebuild of the 83 bike. Love it. Gives me ideas...

I will check the jets. It did have a K&N filter. I still need to replace the air box as it is broken in two places, and the lit is busted as well. If I need to modify it to meet what the jets and filter require, I am sure I can do a better job than the previous "hack".

As for the oil mod, I guess I need to get on that. There are several examples to go by here. I like your example on the 83 project bike. I suppose the factory oil line goes away and I will need to cap its tap location. While I am at it, I will remove the valve covers and inspect the cams and adjust the valves. Hopefully, the cams look good as this bike has 34k miles on it.

looks pretty clean IMO

[image: View Post]Mrgrn, on 23 August 2010 - 09:01 AM, said:

looks pretty clean IMO


Thanks! I just washed it!

Well, its in great shape. It needs a tune up, fork seals, head stock bearings (got a notch). Otherwise its a terrific bike, and I cannot wait to really put it through its paces.

[image: View Post]csteinmayer, on 23 August 2010 - 08:59 AM, said:

Thank you Seb, btw... been reading your rebuild of the 83 bike. Love it. Gives me ideas...

I will check the jets. It did have a K&N filter. I still need to replace the air box as it is broken in two places, and the lit is busted as well. If I need to modify it to meet what the jets and filter require, I am sure I can do a better job than the previous "hack".

As for the oil mod, I guess I need to get on that. There are several examples to go by here. I like your example on the 83 project bike. I suppose the factory oil line goes away and I will need to cap its tap location. While I am at it, I will remove the valve covers and inspect the cams and adjust the valves. Hopefully, the cams look good as this bike has 34k miles on it.


You're welcome... do you have all the broken pieces? If you do, you could just glue it back together with some plastic glue?

And yes, if you do an oil mod, you'll very likely be capping the stock location by threading in a regular bolt.

Beautiful looking Interceptor csteinmayer, you see so few in that good of shape anymore.
I've installed an aftermarket top end oiler on my '84 700, I've included a picture that shows the oil lines coming from the bottom/front of the engine in route to the cylinder heads. They originate from a collar that mounts between the block and oil filter.
I'm not sure of what the board policy is concerning vendors and promoting products, but if you would like to pm me I can give you my overview and opinion of the kit I used.
Again, great looking bike

Take care
Scott

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