my porting attempt adding bost ports to a dt 125

robin aka reg · 26-07-10, 08:14 PM

got realy bored and added a bost port to my dt 125 barrel up loading pictures now

robin aka reg · 26-07-10, 11:20 PM

pleas commen on what else i shuld do etc

max-rs50 · 27-07-10, 06:17 PM

smooth it out for a start lol.
what did you use to cut it out?

robin aka reg · 27-07-10, 06:55 PM

a dremmel ive only done one side im having trobble making it smoth inside as the dremm cuters dont go in very far

Paul@PJ · 27-07-10, 07:26 PM

Good effort there however

thought I would point out to you; that you will have issues with the exhaust gases feeding back into the transfer ports due to the side of the piston.

There is a cut away on the side of the piston just above the G-pin and below the rings and the gases will travel past it.

That is why you can not fit TZR pistons in the 3MA TZR 250 as they have these type of exhaust sub ports.

robin aka reg · 27-07-10, 07:31 PM

im smashing my head on the keyboard right now could i not fit the piston from a 3MA TZR 250

dudejb46 · 12-08-10, 03:42 AM

Originally Posted by robin Aka Reg

im Smashing My Head On The Keyboard Right Now Could I Not Fit The Piston From A 3ma Tzr 250

P M S L

EEKNOWS · 19-08-10, 01:47 PM

That's a fantastic first up effort. If you get a 90 deg tool you can clean those up very nice.They appear to be the correct size and shape and the bridges with looks even. You have done a better job than most 'professionals' Don't worry about any short circuiting of gases etc etc blah blah blah as the benefits of the boost ports will massively outweight any of that.

The port windows will need to be chamfered be for installation though

robin aka reg · 19-08-10, 03:17 PM

i have got a 90 degree tool from dremle but it is to bid to fit into the barrel

26-07-10, 08:14 PM	#1
robin aka reg Junior Mechanic Join Date: Jan 2009 Location: plymouth Posts: 190	my porting attempt adding bost ports to a dt 125 got realy bored and added a bost port to my dt 125 barrel up loading pictures now

27-07-10, 06:17 PM	#3
max-rs50 Old Hand Join Date: Jun 2008 Location: Bracknell, Berkshire Posts: 2,923	smooth it out for a start lol. what did you use to cut it out? __________________ Build a man a fire, and he'll be warm for a day. Set a man on fire, and he'll be warm for the rest of his life.

12-08-10, 03:42 AM	#7
dudejb46 Newbie Join Date: Aug 2010 Posts: 3	Originally Posted by robin Aka Reg im Smashing My Head On The Keyboard Right Now Could I Not Fit The Piston From A 3ma Tzr 250 P M S L

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26-07-10, 11:20 PM	#2
robin aka reg Junior Mechanic Join Date: Jan 2009 Location: plymouth Posts: 190	pleas commen on what else i shuld do etc

27-07-10, 06:55 PM	#4
robin aka reg Junior Mechanic Join Date: Jan 2009 Location: plymouth Posts: 190	a dremmel ive only done one side im having trobble making it smoth inside as the dremm cuters dont go in very far

27-07-10, 07:26 PM	#5
Paul@PJ Junior Mechanic Join Date: Dec 2007 Posts: 393	Good effort there however thought I would point out to you; that you will have issues with the exhaust gases feeding back into the transfer ports due to the side of the piston. There is a cut away on the side of the piston just above the G-pin and below the rings and the gases will travel past it. That is why you can not fit TZR pistons in the 3MA TZR 250 as they have these type of exhaust sub ports.

27-07-10, 07:31 PM	#6
robin aka reg Junior Mechanic Join Date: Jan 2009 Location: plymouth Posts: 190	im smashing my head on the keyboard right now could i not fit the piston from a 3MA TZR 250

19-08-10, 01:47 PM	#8
EEKNOWS Newbie Join Date: Aug 2010 Posts: 3	That's a fantastic first up effort. If you get a 90 deg tool you can clean those up very nice.They appear to be the correct size and shape and the bridges with looks even. You have done a better job than most 'professionals' Don't worry about any short circuiting of gases etc etc blah blah blah as the benefits of the boost ports will massively outweight any of that. The port windows will need to be chamfered be for installation though

19-08-10, 03:17 PM	#9
robin aka reg Junior Mechanic Join Date: Jan 2009 Location: plymouth Posts: 190	i have got a 90 degree tool from dremle but it is to bid to fit into the barrel

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