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Go Back   FZ1OA Message Board > FZ1 & Fazer Owners Association > Exhausts, Carburetion & Performance > Gen 2 Exhausts, Fueling & Performance

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Old 04-01-2017, 08:20 PM   #1
ThomasL
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Gen 2 head/base gasket options

I have been doing a lot of reading and still have not seen much about what thinner head gasket may be comatable with a Gen 2. Lots of talk about Gen 1. Is there a series of years of the R1 gasket that can be used on the Gen 2 FZ1? I also understand that the base gasket may be available in thinner versions. Yamaha, Cometic?? Anyone have part numbers for either?
Thanks in advance.
Tom
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Old 04-03-2017, 04:03 AM   #2
deundeun
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I am rebuilding my engine and want like you put a thinner head gasket.

The base gasket is the same for both FZ1 and R1 (04/06) and is 5VY-11351-00-00

As Ivan said:
the stock FZ1 is approx .032" thick and is 2D1-11181-00-00 with a 11.5:1 compression ratio
while using stock R1 wich is 5VY-11181-00-00 will give a 12.4:1 compression ratio

A R1 race head gasket with 0.020" will give a 13.3:1 compression ratio
But the only R1 race head gasket available (it seems that the YEC are no longer available) is the Cometic C8686 wich is 0.018".

I don't want to have to use only RON 98 fuel so I will use the stock R1.
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Old 04-13-2017, 07:23 PM   #3
ThomasL
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Thank you for your reply. I had seen some mention of that but I thought it was refering to the Gen1. I did find the C8686 gasket and was thinking that it may be the answer. My OEM gasket was .032" as you mentioned. Do you know what thickness the stock RI 5VY-11181-00-00 gasket is?
Tom
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Old 04-18-2017, 01:39 PM   #4
AFM674
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Quote:
Originally Posted by ThomasL View Post
Thank you for your reply. I had seen some mention of that but I thought it was refering to the Gen1. I did find the C8686 gasket and was thinking that it may be the answer. My OEM gasket was .032" as you mentioned. Do you know what thickness the stock RI 5VY-11181-00-00 gasket is?
Tom
2D1 and 5VY are the same gasket...the first three digits just specify the model. The 11181 in both part numbers are the same. Someone please chime in if this is wrong. 99.9999 percent sure I've got it right. I also would consider doing this at my valve adjustment if it doesn't hurt torque/mid range.
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Old 04-23-2017, 08:58 PM   #5
ThomasL
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I believe they will be a different gasket. From my recollection 11181 in the middle of the part number designates that it is a head gasket, 11351 a base gasket etc.. The 2D1 and 5VY would designate the bike model and the numbers at the end would be used for thickness options. Been 32 years since I worked at a Yamaha dealer so I may have that wrong. From my calcs the .018" gasket only gets it to 12.17 versus 11.4 with the .032 stock gasket. What thickness is the stock R1 gasket?
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Old 04-24-2017, 12:39 PM   #6
deundeun
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I am waiting for my R1 5VY head gasket so we will know the thickness in a few days
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Old 04-27-2017, 01:33 PM   #7
deundeun
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Hi,
so my 5VY head gasket is in my hands.
It is a double layer gasket. The thickness at the "5VY" letters is 0,46mm.
If someone has the 2D1 and can make a comparison... I will be able to do it this WE also.

Last edited by deundeun; 04-27-2017 at 02:02 PM.
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Old 04-28-2017, 07:05 AM   #8
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Ok so I just looked to my old 2D1 and it's 0,92mm with 3 layers...
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Old 05-07-2017, 03:19 AM   #9
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I am looking to rebuild my engine also and I have found some piston kit online stating 13:1 high compression pistons.
How do I 'calculate' what compression ratio that I will end up at if I use the high compression piston kit together with the thinner R1 gasket? Will it bump up the compression ratio even higher? TIA for any replies...
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Old 05-07-2017, 03:20 AM   #10
karmatrix
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High compression pistons?

I am looking to rebuild my engine also and I have found some piston kit online stating 13:1 high compression pistons.
How do I 'calculate' what compression ratio that I will end up at if I use the high compression piston kit together with the thinner R1 gasket? Will it bump up the compression ratio even higher? TIA for any replies...
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Old 05-16-2017, 05:47 PM   #11
ThomasL
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Without a physical dome volume to compare to your stock piston it will be tough to be accurate. Idealy you would pour the chamber full with the piston sealed at tdc with the gasket you are using. (Swept volume+TDC vol)/TDC vol=Compression ratio. Making some assumptions and working it backwards, a TDC pour to result in 13:1 would be 20.8cc's. Reducing the head gasket from .032" to .018" should decrease the volume by 1.66cc's to 19.14cc's at TDC. That results in 14.03:1
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Old 05-16-2017, 06:20 PM   #12
ThomasL
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Making the same assumptions on my motor with the stock piston, a standard motor should pour 24cc's at TDC to get 11.4:1 which is what I understand stock to be. Decreasing the gasket thickness to the .018" gasket on the stocker increases it to 12.17:1. I have done the .018" gasket in mine now and moved the cams to 107/102 at the advice of Ivan. His ECU flash, Yoshimura header and R77, ported head and a quick shifter. i imagine it should be a pretty noticable difference from stock so I am pretty excited to get out for a ride!!
Tom
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Old 06-03-2017, 10:10 PM   #13
ThomasL
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I have been really enjoying the changes. Way stronger and better mileage to boot. Riding about 70-75mph got 48.8mpg imp. One pass down the local drag strip, slipping the clutch to keep the front end down and went 10.56@131.9. Can certainly be quicker with the front tied down a bit, regearing and better technique. Only a 1.89 60' so a bunch to gain there. No intention to run it on the track any more though. Not wanting to beat up the clutch. Fun bike😊
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Old 06-16-2017, 10:08 PM   #14
ThomasL
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So much for not beating up on my bike again. My son wanted to run his bike tonight so I went back out with mine so we could hang out together. 10.54 @131 again but drove through the clutch in first gear. Warped all the steels. When I pulled it apart, the inside of the clutch was dry as can be, zero oil. Basket and hub look fine. I will have to do so searches and see if this is a problem with these bikes. Oh well it was fun.
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Old 06-20-2017, 09:33 AM   #15
bjamick
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I'm on my l3rd clutch from drag racing. I think I've got the best option now with stock clutches and HD springs. The Kevlar fibers with HD springs worked well but short life.
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Old 06-23-2018, 12:09 AM   #16
deundeun
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Hi, I have done the final mods: R1 head gasket, cams @ 105/100 (because there is already so much at top end) and full Yoshimura exhaust. I also have removed cast flash marks.
Of course valves have been cleaned and valves seals have been changed.
Others settings are Ivan's ECU flash with his PC5 map, full AB mod with K&N air filter.
Red line is without the R1 head gasket (and the 105/100 cams timing) and gutted stock header with Akrapovic SO
Blue line is full monty.
FZ1vsFZ1.jpg

It ROCKS, the only thing I Can say !

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Old 10-09-2018, 09:29 PM   #17
NMWBT
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I recently ordered an R1 head gasket and it says it is .027” thickness. Is it worth installing? The Cometic part number is 415184 and is a replacement for 5PW-11181-00-00. Should I go with the .018” version instead?
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