Yzf 250 19 High compression piston

MadsDausel
Can it run on pump gas with 14.5:1? Which pipe gives the Best power? I Think about a Bills pipe or akaprovic
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kb228
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kb228 12/12/2018 3:24am
12/12/2018 3:24am Edited Date/Time 12/12/2018 3:25am
Youll need at least 93 octane gas. Some bikes with HC pistons will run on it just fine and some wont. Try it and see.

About the pipe, i want to think FMF makes the most power. Double check that tho.

Also youll gain more power with a remap than with those two mods. Consider that.
GoYamaha
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GoYamaha 12/12/2018 5:57pm
12/12/2018 5:57pm
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster of a motor now.
gavinmgrant
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gavinmgrant 12/12/2018 7:58pm
12/12/2018 7:58pm
Rocket Exhaust makes really good exhaust systems and can build them for custom builds and set ups. Check them out. Good prices too.
MadsDausel 12/12/2018 9:38pm
12/12/2018 9:38pm
GoYamaha wrote:
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster...
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster of a motor now.
How High compression? Smile

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ChrissyDMX 12/13/2018 1:42pm
12/13/2018 1:42pm
kb228 wrote:
Youll need at least 93 octane gas. Some bikes with HC pistons will run on it just fine and some wont. Try it and see. About...
Youll need at least 93 octane gas. Some bikes with HC pistons will run on it just fine and some wont. Try it and see.

About the pipe, i want to think FMF makes the most power. Double check that tho.

Also youll gain more power with a remap than with those two mods. Consider that.
when you say remap you mean with the GYTR tuner? I was thinking about getting one but was told i should get an AM exhaust first. Or do you think i would benefit from a tuner.
GoYamaha
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GoYamaha 12/13/2018 4:48pm
12/13/2018 4:48pm
GoYamaha wrote:
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster...
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster of a motor now.
MadsDausel wrote:
How High compression? Smile
I am running a 14.5:1 piston. Stock is 13.8:1. I am running U4.4 when above 85 degrees and MR12 below 85 degrees.
GoYamaha
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GoYamaha 12/13/2018 4:49pm
12/13/2018 4:49pm
kb228 wrote:
Youll need at least 93 octane gas. Some bikes with HC pistons will run on it just fine and some wont. Try it and see. About...
Youll need at least 93 octane gas. Some bikes with HC pistons will run on it just fine and some wont. Try it and see.

About the pipe, i want to think FMF makes the most power. Double check that tho.

Also youll gain more power with a remap than with those two mods. Consider that.
ChrissyDMX wrote:
when you say remap you mean with the GYTR tuner? I was thinking about getting one but was told i should get an AM exhaust first...
when you say remap you mean with the GYTR tuner? I was thinking about getting one but was told i should get an AM exhaust first. Or do you think i would benefit from a tuner.
The 2019 does not need the GYTR tuner, it is app enabled.
MadsDausel 12/13/2018 9:52pm
12/13/2018 9:52pm
GoYamaha wrote:
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster...
My 19 will not run on 93 here in Florida, USA. It detonates like crazy. Switched to recommended fuel, VP U4.4, and it is a monster of a motor now.
MadsDausel wrote:
How High compression? Smile
GoYamaha wrote:
I am running a 14.5:1 piston. Stock is 13.8:1. I am running U4.4 when above 85 degrees and MR12 below 85 degrees.
How much more work to the engine? And have you try it on a dyno?
kb228
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kb228 12/14/2018 2:12am
12/14/2018 2:12am
A dyno would give anyone the best results. Sending your ecu off to get done by tokyo mods is 2nd best. Trial and error on your tuner app is also feasible. Ill bet theres a bank of maps developing online somewhere. That app thing is cool as hell.
GoYamaha
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GoYamaha 12/14/2018 5:47am
12/14/2018 5:47am
MadsDausel wrote:
How High compression? Smile
GoYamaha wrote:
I am running a 14.5:1 piston. Stock is 13.8:1. I am running U4.4 when above 85 degrees and MR12 below 85 degrees.
MadsDausel wrote:
How much more work to the engine? And have you try it on a dyno?
It is a full motor.
High comp piston
GYTR head and cams
Carrillo Rod (balanced)
Polished, back cut and blued trans
Ceramic bearings throughout
Rad hoses, enlarged radiators
Full FMF Ti exhaust
MadsDausel 12/14/2018 5:51am
12/14/2018 5:51am
GoYamaha wrote:
I am running a 14.5:1 piston. Stock is 13.8:1. I am running U4.4 when above 85 degrees and MR12 below 85 degrees.
MadsDausel wrote:
How much more work to the engine? And have you try it on a dyno?
GoYamaha wrote:
It is a full motor. High comp piston GYTR head and cams Carrillo Rod (balanced) Polished, back cut and blued trans Ceramic bearings throughout Rad hoses...
It is a full motor.
High comp piston
GYTR head and cams
Carrillo Rod (balanced)
Polished, back cut and blued trans
Ceramic bearings throughout
Rad hoses, enlarged radiators
Full FMF Ti exhaust
Sounds like a fast yzf Tongue
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GoYamaha
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GoYamaha 12/14/2018 9:51am
12/14/2018 9:51am
MadsDausel wrote:
Sounds like a fast yzf Tongue
No clue yet, can’t ride until Feb/March due to injury so I won’t know until then unfortunately. This was a “dream build” for me. Never done this much to a motor until now.
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