Messages

1

Tech Talk / Re: improving bottom end power

« on: April 05, 2018, 10:28:21 pm »

Well today i remembered i had a pipe i made up for a dt200L which worked very well. Comparing the 2 pipes it is longer in the header.this motor shares the same bottom end as the  blaster..not crank case inducted . I would asume port timing would be closer between these 2 motors. Im going to cut it and fit it to the dt200r/ blaster big bore motor..and go from there..thanks again guys

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Tech Talk / Re: improving bottom end power

« on: April 04, 2018, 02:01:49 pm »

Yeah i had a d slide 30mm befor the lectron on the water cooled top end..i did notice the drop in bottom end when swapped.. but was keen to try the lectron as i ride at different elevations all the time.. i think ill go back..as for the pipe i lookedat it today..just dont think ill get 100mm in there

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Tech Talk / Re: improving bottom end power

« on: April 03, 2018, 10:13:54 pm »

Yeah..but mixing and matching is what i enjoy..i ride with a mate who has a basically stock dt..its much easier to ride in the very slow tight stuff..due to the power valves..but after 1/4 throttle my bike runs away easily..its also feels considerably lighter..less top heavy to be more specific as it has no radiators plumbing fluids and protective frames and guards..so pros and cons.. my idea behind the engine was a nice simple smooth air cooled engine with oil injection With fun power..thanks for your help it has given me some direction

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Tech Talk / Re: improving bottom end power

« on: April 02, 2018, 09:51:25 pm »

Yeah i have just been researching base gasket thickness.. now i think about it makes perfect sence..it does feel like a porting or pipe issue..maybe i can run a thinner bace gasket to lower the exhaust port ill check the head squish to make sure i have enough tollerance..also with that kind of compression should i be running as high octane as possible..would that make much difference thanks again

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Tech Talk / Re: improving bottom end power

« on: April 02, 2018, 08:31:49 pm »

Thanks guys.. it will be difficult to lengthen the header pipe. I have advanced the timing by adjusting timing plate.
As far as the carb goes its a lectron which has a metering rod..not jets as such..i have noticed these carbs seem to loose bottom end response dispite claiming the opposite. I will try a different carb .i have heard of lifting the cylinder thicker bace gasket.?.the bike has almost 170psi compression . I had not heard of steel wool in muffler before..any one used reed spacers to increase bottom end

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Tech Talk / improving bottom end power

« on: March 31, 2018, 09:59:42 pm »

Hey  looking for some guidance in improving bottom end power and response.
The bike is a dt200r but with a twist..it has a blaster 240cc big bore air cooled top end married to the crank case inducted bottom end boyessen dual reeds 30mm lectron carb and wr200 fmf pipe. Off throttle is quite flat and slow tight stuff gives the clutch hand quite a work out. The mid and top end is opposite comming on hard with light switch delivery.. which makes it hard work.. im happy to move the power in favor of the bottom end .any mods you can suggest would be great to try..was even thinkkng of a early honda style exhaust pv set up..lol

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Wanted / Re: rg suzuki

« on: November 12, 2017, 08:50:17 pm »

Sounds like a yamagama being cooked up.. i built one once..great bikes i may be able to get u a roller but im in nsw

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Wanted / yz125 cylinder 86/88

« on: November 08, 2017, 03:55:25 pm »

Im after 2 x yz125 cylinders and heads prefer 88model but will consider 86 and 87 thanks

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 08, 2017, 02:44:12 pm »

Yeah i agree.. i compared some86 to 88 yz125 cylinders today at local wreckers they had far bigger transfeer and extra ports.. apart from they would just about bolt on the cylinder was the same dimentions in all other respects..

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 08, 2017, 09:40:57 am »

Thanks mark..i have looked into the 2xt cylinders a lil more. i have found some but it would also seem the pistons are hard to find and very exspensive .i understand u had your cylinders re bored and plated to take dtr125 pistions..so the whole operation could end up quite expensive for a street bike i agree the tzr is a great under estimated engine but my mind is always ticking, thinking outside the box..yeah i could put 350 in it but i would like to keep it tzr if i could.. i read someone mentioned yz125 cylinders of the similar era.. i can only imagine they would be in a much higher state of tune than a tzr.. and im sure could be had for not much money but has any one done it..thanks again for all the imput.

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 06, 2017, 11:08:16 pm »

Well  yes the 2xt version of that motor was a big up grade..but it was just not  the cylinders but the huge intakes which belong to the bottom end..cylinders are also plated (not really a fan) and very rare..but i agree a tzr can and is a great engine to start with.. fun to explore other options tho..

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 06, 2017, 03:45:41 pm »

Yeah i think putting an rz/ banshee motor/top end may be a much easier option.. a few months ago i had great success when i mated an aircooled blaster quad 240cc big bore top end on the crank case inducted dt200r bottom end.. yes i lost powervalves and water cooling but the improved port layout and increase in capacity made for a great simple powerfull lil engine.. it just got me thinking more about the advantages of crank case induction and seeing how a tzr is basically a twin dt200 thought there may be a way to take advantage of yamahas history of motor similarities....there is one combination that would work..a twin cylinder air cooled crank case inducted 350cc using 2 dt175 cylinders on a tzr bottom end ..cylinders  will almost bolt on ..to what advantage i dont know..lol but would make a very torquey very smooth lil motor...

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 06, 2017, 11:33:28 am »

Yeah i had also seen thesehttps://www.ebay.com.au/itm/Yamaha-RD350-Liner-Sleeve-For-Cylinder-Barrel-Set-of-2-For-RD350-64mm/263168335818?hash=item3d460e1fca:g:FQAAAOSwk9dZoROk
Id really like them to start at at least 66mm to keep machining costs down i guess it opens up more problems then just sourcing the sleeves. For one the power valves would prob not be able to be used..so a port design to suit would need to be worked out.. by someone smarter than me..lol
There also these ...https://www.ebay.com.au/itm/YAMAHA-DT200-1990-1991-1992-COMPLETE-BIG-BORE-KIT-250cc-BRAND-NEW/172851043103?epid=2222206353&hash=item283eb99b1f:g:Fw8AAOSwRoZZh7WE
But the dt is 7mm longer in the stroke to a tzr im not sure if you could simply trim the top or bottom of sleave to accomodate for the shorter stroke again power valve would be no longer used but at that much larger capacity im sure it would not be needed

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 04, 2017, 08:36:11 am »

Yeah thats another good idea.
The motor/bike in question is a tzr250,dont get me wrong its a fantastic and fast lil motor.. i have always thought its a shame they never made a 350cc like the rd and rz before it.. i saw a guy fit dt200 cylinders to one..but it was alot of work and $$ so after a few measurements and comparisons it seems that a dt175 is the same stroke but 10mm bigger bore the bace to deck height is also the same and the pistons also match as do dt200r. I would do the mod to a set of max bore tzr cylinders ...it could be done relatively cheaply i think although alot of time,..to what result or success over the standard 250cc motor who knows. Its bottom end torque that i would be chasing..

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Tech Talk / Re: dt or it175 cylinder sleeves?

« on: November 02, 2017, 10:14:51 pm »

Ahh well thats a good idea use a 4stroke sleeve and cut the ports..