800 Y pipes hard to find?

[Roadrunner]

Looking at 800 pipes on Ebay but they do not come with the Y Pipes. Are Y Pipes hard to come by?
Doug

[4with4]

Doug
You don't need the pipes, just the Y's. I checked with the dealer last spring and again 3 weeks ago when I was in picking up parts. The 750 and 800 pipes are the same. They have a different part # on the computer. 750 starts with 89X or something like that and the 800 starts with 8BU. When you go to check on the price, the 750 pipes change up to the 800 number. Just like the belts. According to them, the 750 and 800 pipes are the same. I have a set of 750 pipes with 750 and 800 Y's. The 800 Y's are larger in diameter but they still attach to the pipes properly.

Ian

[Brad]

Roadrunner The pipes of the 750 and 800 are not the same, the inside diameter of the 800 pipe is the same inside diameter as the 800 y-pipe almost 2" inside diameter. There would be no point in using 800 y-pipes with 750 pipes.

[vmax4rules]

:agree:

[JAMIE]

800 Y-pipe OD 52mm
750 Y-pipe OD 49mm

[YAMMIEGOD 3:16]

GUYS THIS IS INTRESTING. HEY MAYBE I AM EVEN WRONG HERE !! I HAVE THE 1995 YAMAHA TECH MANUAL. IN THIS MANUAL , WHAT YAMAHA DOSE IS GIVE ITS INPROVEMENTS PER MODEL YEAR. ANOTHER WORDS THE 95 VMAX 800 WOULD BE CONSIDERED NEW AND INPROVED OVER THE 94 VMAX 750. THE ONLY INFO ON THIS EXHAUST SHOWS THE Y-PIPE FLANGE BEING FLARED ON VX750 AND MACHINED FLANGE ON VX800. NOW, ALSO IT SHOWS INSIDE DIAMETER IS INCREASED OF Y-PIPE TO 48mm FROM 46.2mm AND STAES FOR BETTER ENGINE BREATHING. NOWAY IS ANYTHING SHOWN ABOUT CHANGE TO ACTUAL PIPE SIZE. 3:16 (tony)

[YAMMIEGOD 3:16]

92-93-94 VMAX750 TWINS:
89A-14620-01-00
89A-14630-01-00
95-96-97 VMAX800 TWINS:
8BU-14620-00-00
8BU-14630-00-00
AGAIN PIPES ONLY HERE NOT Y !! 3:16 (tony)

[AL P]

I really think we need to settle this once and for all. i can take my 800 pipes off, and use my caliper to measure them, then I will take a picture while I`m measuring them, so somebody with a 750 can be sure they`er measureing thier pipes at the EXACT same spot and way. and we can compare. this has been a debate for awhile, so lets just do it and get it over with. anyone?

[Brad]

Maybe these pics will help. The socket is 49mm outside diameter. It will drop right thru the 800 pipe!

[Roadrunner]

Well, I didn't win the pipes but at least this must of brought up a good thread!

Doug

[RDL 93 V-MAX4]

Well, I didn't win the pipes but at least this must of brought up a good thread!

Doug

:agree:

[RDL 93 V-MAX4]

Hey Doug check out this post!! It might help you out.

http://www.vmax4.com/vbulletin/showthread.php?t=195

[J-Max4]

There was something about this in the tech page.
http://www.vmax4.com/dynotech95_800.htm

I am going to mod my 750 pipes to match the 800 pipes next weekend. I will send some pics.

Juha :worthless

[4with4]

It's hard to argue when you don't have both sets of pipes. As I stated before, all my info has come from the dealer. Yamaha may have made a change and don't offer the original 750 pipes anymore. All I can guarentee is that in Canada, if you order a set of 750 pipes today, they will be the same as if you ordered a set of 800's. I have checked on pipes only. Maybe they made the change to the Y's as well. I'll check it out next time I'm there.

Ian

[J-Max4]

The only difference what i have found is that the flange, on the 750 ,is welded inside the chambers pipe. 800 flange is welded against the chambers pipe, so the inside dia. is larger (look at the Brads first pic). Same thing with the y-pipes.

Juha :homework:

[93vmax4]

So after seeing all the post about the 800 exhaust on the 750, and since I happen to have a set of 800 y's / pipes / silencer. My question is ---

If I install these and run the 141.3 jets that came with them, will I truly see the 8-10 hp gain that I was told I would?
Do I need to switch to the 141.3 jets instead of my stock 93 750 jets (what ever came stock- I have not checked them).

Second question on this - Since I run at sea level or closely above are there any changes that can be SAFELY made to the needle clip position or air screw that will improve overall performance with out chancing a melt down.


New to the 4 cyl mechanics, but a mechanic by trade.

Thanks


:banghead:

[YAMMIEGOD 3:16]

WHEN YOU INSTALL 800 PIPES ON THE 750, CARBS MUST BE JETTED TO 800 SPEC. YOU WILL GAIN 9 HORSE BY THIS CHANGE. !! 3:16 (tony)

[J-Max4]

Ok, we moded the pipes, here is a before pic:
http://img138.imageshack.us/img138/5224/reuna1zb.th.jpg (http://img138.imageshack.us/my.php?image=reuna1zb.jpg)

then we cutted it:
http://img138.imageshack.us/img138/6366/kantti3ds.th.jpg (http://img138.imageshack.us/my.php?image=kantti3ds.jpg)

Then a littlebit smoothening:
http://img138.imageshack.us/img138/6945/kanttipois5vf.th.jpg (http://img138.imageshack.us/my.php?image=kanttipois5vf.jpg)

Then we welded 2" exhaustpipe to it:
http://img138.imageshack.us/img138/6663/hefti4ag.th.jpg (http://img138.imageshack.us/my.php?image=hefti4ag.jpg)

[J-Max4]

Welded:
http://img138.imageshack.us/img138/1815/hitsattu2eu.th.jpg (http://img138.imageshack.us/my.php?image=hitsattu2eu.jpg)

Painted:
http://img138.imageshack.us/img138/4057/maalattu4lp.th.jpg (http://img138.imageshack.us/my.php?image=maalattu4lp.jpg)

Same thing to the other pipe, and now we have something like this:
http://img138.imageshack.us/img138/2961/molemmatmaalattu3af.th.jpg (http://img138.imageshack.us/my.php?image=molemmatmaalattu3af.jpg)

Hope it was worth it, wasn't expensive but took a few hours of work. We'll see that when/if we get some snow :i_need_sn

[bly123]

That looks impressive. I'll bet you get more than an extra 10 hp out of it with that. You will definatly have to go more than the 141.3 jets for that. I put the 800 Y pipe and 800 pipes on my Vmax4 and I did mesure the diference between the 2. The 800 Y pipe and the 800 exhaust pipes had a larger diamiter opening. Not alot but definatly larger. I jetted with th 141.3 jets but I also put Boysen Reeds on too. They say the reeds will richen the mixure up some so I sould be plenty safe with my jetting. If any thin maybe too rich.

[J-Max4]

Oh and sorry that the pictures are not working very well. Have to see about the jetting, better to start from too rich than too lean :)

[crazykid]

Really cool to find this post,even though its fairly old. This is exactly what i was thinking of doing, I was thinking that from the pics i have seen an the posts i have read it seems that this was the only difference between the 750 and 800 pipes was the flange openings. So do you have an update on weather this worked or not? It makes sense that it would work but would like to hear for sure if it worked or not. hope to hear an update from someone, anyone? Thanks (crazykid)