thinn head gasket or the thick one?

[PowerTech]

250r rebuild over the next few weeks

i have used the thick head gasket in the gasket kits in the past.

the kits i get come with 2 i think the thin one is for a CR 250.but i am not sure?

it is thin and steel ,like two layers of thin steel , it is coated in black stuff but it is all steel.can i use this thin one to make it run stronger? does it seal good enough?

wich one do yall use?

is there a problem with the squish area using this thin gasket?

i know about carb jetting......well enough to get it done and a hand fulls of jets.


i have allways used boysen power reeds .the ones that are 2 stage. and the stock cage.what about going with that Vforce reed cage? is this thing worth the money? and were do you feel the power it makes if any? i dont need it to start any easyer she has allways been a first kicker

and has anyone made a air box ring for the ATC 250R?

thanks for taking the time.

i want to get this baby rite better than ever. i allways maintained it well. i am a mechanic. but this time around it want it to be even better than last build.

[deathman53]

I have a airbox ring on the atc airbox on my quad, the tube it fits right in and stays tight, the air filter you need to wrap it in some tape the take up the extra space for a tight fit. Don't use the thin gasket unless you want to use ONLY race gas.

[PowerTech]

the part of my airbowx that is colapsing is on the outside of it were the boot hose clamps to it. any remidy for this?

[Pete]

I take a stock Honda gasket, and lightly drill the 2 ends where it is held together. I then take the thick middle part, and one of the metals, and set them aside.

I then spray copper gasket coat on the remaining metal part, both sides, and put the head on using that. It hasn't leaked yet.

[MathGSR98]

I would use the thin gasket to get higher compression. I don't think you will have to use race gas. Best thing is to do a compression test and see how many psi you got. Run it with 93 octane and you will be alright. I am rebuilding my top end and I plan to separate the stock head gasket and then use just 1 thin layer.

[Fox250R]

Some say use race gas only, some say using 93 would be just fine.. WITCH IS IT??? LOL......I mean comeon..Does anybody out here really know?

[MRPoopie]

my friend has a high compression piston in his 400ex and hes runs 93 just fine
but im sure you would get better performance from ras gas

Clayton

[MathGSR98]

Some say use race gas only, some say using 93 would be just fine.. WITCH IS IT??? LOL......I mean comeon..Does anybody out here really know?

It just depend of your final compression ratio. It's not all the engine that use a thin gasket that will have the same compression ratio. It depends of you ring wear, piston type and other things. If you are above 195 psi you should be good with 93 octane.

[Billy Golightly]

You can, IMO, get by with 93 until about 190-195psi. Anything higher then that and your gonna need some higher octane.

[PowerTech]

thanks . i will test it.

[leetwanker]

I have a airbox ring on the atc airbox on my quad, the tube it fits right in and stays tight, the air filter you need to wrap it in some tape the take up the extra space for a tight fit. Don't use the thin gasket unless you want to use ONLY race gas.

I just rebuilt my top end and the Vesrah gasket kit came with a thin copper head gasket and I'm running 87 octane without issue.

[hrc85250r]

umm, i run a race ported R, with a cut head and the cr head gasket(thin)..it has 220-ish compression and i have ran race gas in it, 50/50 and 87, i have more power with no detonating with 87. i also have my ignition advanved 3 degrees with a 38mm carb and a big reed cage plus a crazy custom pipe that hits hard....still no detonating, top end looks like new had it apart a week ago. one thing i will note, if you dont glue it down good with some gasket shellac or something similar and let it dry you WILL blow the head gasket a couple times a year.

[deathman53]

your nuts, I'm not very familar with a air cooled 250r, but liquid cooled ones are really close to the race gas line with a thin gasket. Do a compression test to tell what octane you need to use. Detonation can cause alot of problems. I was told by several knowledge people that anything above 190 needs race gas. If your head is cut, rechambered dome, extreme porting or other mods may require race gas even if compression is below 190.

[PowerTech]

I just rebuilt my top end and the Vesrah gasket kit came with a thin copper head gasket and I'm running 87 octane without issue.

i put together one of those air cooled R's a long time ago. the kit only came with one gasket and it was the coper one you are talking about. but my bike is a 86

[gravelord]

well, im not argueing any ones knowledge, or saying i know alot - but as long as its mixed and jetted properly - i dont understand why there would be any problem running 93 octane on just about any 250R engine thats not alky..... im sure it may not perform as good, but why would it cause a problem? does any one know the real reason why ? explanation please? im just curious, because i was thinking about going with a thinner gasket my self...