1992 VFR750F Rescue / Refresh

Thank you very much!

 

Just ordered Round 2! Think I got it , will update. Luckily the ones I'm still figuring out are the ones for 86/87 VFRs too.

 

Well.. related to that.. air fuel mixture screws for the 86/87 (and likely many other honda carbs). The kit I bought from V4Dreams appears to have ~2.5ID x 1.2 orings. These seem pretty tight to me.

When ordering bulk orings, I took a guess that the air fuel mixture screws were 3x1mm based on the information from v4musclebike on this thread here:
and mainly this reply. https://v4musclebike.com/forums/showthread.php?t=40293


I also ordered some 3mm x 1.2mm orings.

All three of them seem like they would accomplish the exact same thing. However, the difference in oring diameter (1mm vs 1.2mm) would have an effect on the stock "turns out" setting. Any thoughts on which to go with?

 

Well, you could LIGHTLY seat a bare mixture screw and measure how far it sticks out and then do the same with the spring, washer and o-ring in place to see the difference.

That slight difference is not gonna make any difference in my opinion. I don't bother with any kind of US model only idle drop method for emissions either. I don't want my mixture screws at the leanest possible setting before they want me to install new anti-tampering caps (yeah right!). By now, I know what pilot jets I like and where to start on turns out, and adjust to how it cold starts, idles, just off idle and sounds on deceleration after that. Typically that's one size up from stock and start @ 1-3/4 to 2 turns out from lightly seated.

But PLEASE give some feedback on the 0-rings sizes and how they fit.

 

OH... and a general tip on the limiting tabs on external fuel screws. No need to modify anything to "defeat" them. Just swap the float bowls so the tab they normally can't get past is on the opposite side.

 

Update:

Cross over caps Qty 2
91301-MB0-000 GASKET, CONNECTING CAP 3.76
FKM O-ring 42 x 3mm Price for 1 pc sku: 423MMV *good* 1.25

Water Pump Cover Qty 1
19226-ML7-000 GASKET, WATER PUMP COVER 4.37
FKM O-ring 78 x 2mm Price for 1 pc sku: 782MMV *good* 1.75



The only one I ordered as a Honda part # was the seal from the Connecting cap to the hard pipe, leading down to the water pump. It is a double wide seal, but I'm sure an o-ring would work just as good as it does for in between the CONNECTING CAPS on the short hard pipe. Or double up two 0rings next to each other.



This part is discontinued for one of my other year VFRs (95?), so I will likely experiment at some point in the future if needed.

 

Fuel Tube o-rings were at imminent failure.

 

Another cooling system restored. Ugh.


Sand blasted and sprayed a heat shield and the diaphragm caps while I was at it.

 

I went to the Honda dealer today to order a number of parts for the 1999 restore and while I was at it I ordered a number of the O rings needed for the rebuilding of the coolant system.
I was told this special double O ring Honda# 91315-MBO-013 has a (TBA ) status, To Be Announced.
I was still able to order it so we will see
Looks like it is time to study your O ring listing Capt. I got a bad feeling about the ability to purchase Honda parts for older bikes in the near future, Mr Honda must be rolling over in his grave, he was quoted one time many years ago that there would always be parts for his bikes, and it was true, I remember when you could order a no longer stocked exhaust for a CB 350 F , and if you wanted long enough you would get the exhaust, as soon as a batch was made

 

I found that seal on eBay for a really good price with actual reasonable shipping, so I ordered 2.

He has 4 left.

https://www.ebay.com/itm/3542028678...YEhpNVlKYvKu9DWv93a/oxKSE=|tkp:Bk9SR7Du4ubXYQ

 

Thnaks for the lead to the eBay seller, I would have bought at least two myself but of course he does not list shipping to Canada. The land of the wild and free but don't try and have anything shipped to here

 

Oh yeah... I forgot. I shipped a brake caliper pin holder to straycat as a favor. Unbelievable.

 

It blows me away that Honda would discontinue a part the fits all those bikes he has listed. He could be wrong, but somehow I doubt it.
Sorry. Reread that and I guess they aren't discontinued, just not available right now.

 

I was told this special double O ring Honda# 91315-MBO-013 has a (TBA ) status, To Be Announced.

I got curious yesterday and wanted to know just exactly TBA really means these days with supply shortages etc.
I was told TBA could mean the TBA parts could show up in a month, maybe 6 or as the parts man said never as it's status could change to No Longer Available,
great, since I already paid for the parts I will give it a month to see what happens and go from there.

When I was placing this latest order I figured I would get a few brake line crush washers so I would be ready to rebuild the clutch slave cylinder on the VFR.
This part, Honda# 90545-300-000 has been around since 1969 when Honda first shocked the world with the CB750 and it's production line front disc brake,
( part code -300- refers to the first generation CB750 ), and I believe this crush washer has been used on almost every Honda have a hyd. brake/clutch system since.
Anyway I started looking at the 1999 VFR800 parts listing and there is, by my count 31 -300- crush washers on the VFR800, I know I will not need that many but it sure pissed me off when I saw the price was around $9.50 each, not going to happen Honda, what a crazy price for a part that has been in production for over 53 years
So guys I am sure some of you have figured this out long ago with all the rebuilding you do and can you suggest any good sources of quality crush washers and in addition to this question do you normally anneal the washers before you use them or are they soft enough from the supplier?

 

What in the actual fuck?! I guess I never realized how expensive they have gotten. Years ago I wrote them off and they weren't even close to that.

I buy Russell or Goodridge aluminum crush washers off eBay when I come across good deals on a package. I also just looked and you can (well, I can) get US shipped aluminum crush washers, a 50 pack for $14.56 free shipping. I use them as they arrive. Shit, I've even sorted thru my huge bag of used ones from breaking down bikes and re-used the nicest ones in a "this has to go together right now" pinch. Yes, yes, I know, the Service Manual states you should replace them EVERY TIME for safety.

 

I've re-used many... use new ones that come with new lines..... mostly generic as they are used on virtually every bike you know.... measure up and buy some generic ones.......

I've had a couple of stainless lines come with copper washers.....

 

Carbs are almost done. Bench synch and clean up the float bowls.



These carbs were pretty oxidized / stained / dirty. I didn't go crazy trying to make them "shine", but they are clean. You can't see them at all when installed and done.

All new o-rings. #42 pilots. Stock mains for now until the full Two Bros exhaust goes on.

 

Cooling system is going back together.



That engine has been SCRUBBED multiple times. Kinda a shame to install these restored bits on there, but a lot of things need to be verified before any kind of "Resto" happens. And with the carbs out, I thought, what the hell? I am very confident this thing is gonna run perfect.

Plus later, there will be zero surprises when taking everything back apart to restore the engine.

 

My personal struggle with O-rings led me to reverse engineer my VF500 rings. For the air/fuel mix screw, I bought these. The bike seems to work perfectly so I would say yes they work. 2.7mm x 1mm.

https://www.mcmaster.com/catalog/129/3956/1302N102

Second was fuel cross tubes o-rings. 2.4mm x 6.6mm. No leaks and with a little o-lube fit great.

https://www.mcmaster.com/catalog/129/3956/1302N097

Now I can do 20 bikes at the rate I am going. Hopefully, test ride for full eval on these o-rings this weekend.

 

I've been using 7x2 FKM/Viton on the fuel tubes for years. Your smaller, but thicker, orings probably stretch out a bit and end up at the same fitment.

Also, while I don't expect you to have any problems, Buna is sometimes not the best choice when dealing with gasoline.



Buna O'ring 70

Buna-N Nitrile o'ring 70 Durometer are heat resistant up to 212°F and 250°F intermittent to -30°F.

The hardness of rubber compounds is measured by the Shore A durometer. The higher the durometer the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most o'ring applications.

Typically used in applications with propane, butane, petroleum oil, mineral oil, grease, mineral oils/greases, diluted acids, alkali and salt solutions at low temps and water.

NOT COMPATIBLE WITH....Gasoline, benzene, trichlorethylene, ketone, acetone, acetic acid, ethylenester, strong acids, brake fluid with glycol base