84 VF750F restoration questions

Hello. I just got for Christmas a 1984 VF750F interceptor, some assembly required. It is one of the top 3 or 4 bikes I have always wanted. It has been sitting since 02 so it requires all the usual stuff - brakes, carbs, seat cover, fork seals, tires etc. Thank youto everyone for the great info available in looking through this site. I have a few specific questions that pehaps someone may have some insight on. I do have the original shop manual. Most of my expirience has been on pre 80's British and Japanese bikes.
1. One of the carb slider diaphram's has a small (1/4") long cut in it. Does anyone know where I could get a new or used diaphram -or- has anyone had success with repairing this type of thing, if so what type of glue did you use?
2. The carbs were mostly apart and were off the bike when I got it. I am a bit confused by the air tubes / fuel tubes, and it came with a few extra bits and pieces. Am I correct in assuming that the air tubes tie together the top ports above the bowls and that is it? I am also trying to figure out their purpose. I assume that the fuel tubes are independant of the air tubes.
3. Can the fork oil be successfully drained without totally tearing apart the forks? I would prefer to be able to just drain the oil and change the seals without tearing them apart further than required.

If anyone has any of the following parts I would be interested:
- A tailpiece. Damaged is ok as long as the frount mounting tabs are intact.
- As above - a carb slider diaphram

Thanks
Steve

 

Congrats on the bike. You can get a new slide here: Honda Yamaha Suzuki Kawasaki Sea-Doo Can-Am Ski-Doo Motorcycle Parts ATV parts Scooter Parts personal watercraft parts Accessories

Really pricey though. Super glue was originally made for rubber products. Works great. Never tried it on a diaphragm. I would use just enough to stick together. The air tubes are carb vents and the fuel tubes are independent from them. See photo. Fuel is left hose, vent is center hose.


If you have any broken body tabs or pieces you can use Plastex to repair. PLASTEX Plastic Repair Kits
It works excellent. I made tabs for my tail section that broke off. It's as strong as the original piece. If you need help with the carbs let me know. I've rebuilt several sets and modified one set . Depending on the condition of the carbs you may be able to use all original parts. The parts I've seen bad are the pilot needles get eaten away on the very ends and should be replaced. It's easy to make new rubber bowl gaskets also.

Your better off taking the forks apart. You have to to get the seals out. Really easy to do. Crack the bottom bolt (where axel is) before removing springs. There is a 10mm bolt at the bottom of each leg to drain them. Use a good 10w fork oil for best results.

 

Thanks for the help. The picture is worth a thousand words and is much better than the pictures I had. Does the air vent system get plumbed to anything or is it just left open above the carbs?
Steve

 

It should go in to the carb plate. It does on my 83. Yours might be different and just left opened. It shouldn't matter except for the possibility of dirt getting in some how.

 

I do not know of anyone who has successfully repaired a diaphragm. Finding new ones is difficult but not impossible. There was a guy on eBay (not fngster/BillyC by the way) who sold replacement diaphragms that you can to install on the slides yourself. I've never tried that but have heard reports that it's pretty easy.

The air vent tubes should plug into the airbox baseplate when everything is installed. You need to vent the bowls for proper operation and that's just the way Kehin decided to do it.

You don't need to disassemble the forks themselves, but they will need to be removed from the bike. That's not terribly difficult providing that you have a stand or way to support the bike when the forks are off.

 

Thanks for the replys. I appreciate your help. I have some more questions but will start a new thread.
Steve