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Post by ferret79 on Oct 11, 2009 16:34:40 GMT 1
hi all,
i am looking into a big bore for my rd, i know that one of the most common is a dt175 conversion.
what i would like to know is, where do i get the parts to do it? and also what other parts would i have to change on my rd to get it to work, ie - conrod etc.
where would i get the barrell liner from to be pressed into my rd barrell? also gaskets on any other stuff that is needed?
hope someone can help me?
many thanks
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Post by twostroker on Oct 11, 2009 18:39:34 GMT 1
if you speak to some one like pj engineering or fahron engineering they could supply the parts and carry out the conversion so all yoi have to do is bolt the top end back on and run it in,failing that you could find a autisia kit on ebay but after its been re-bored ,new piston,head re-profiled to match the 66mm liner its probaly just worth sending your head and barrel away to be converted. ps to get the full benafits of the extra cc's you will need a 28mm carb and a decent exhaust
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Post by ferret79 on Oct 12, 2009 19:15:43 GMT 1
thanks for the reply, thats a great help
i was wondering though is there any specific 28mm carb
if i know what sort to look for i can find one on ebay maybe?
does it mater if its flatslide or round?
thanks
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Post by twostroker on Oct 12, 2009 21:54:53 GMT 1
thanks for the reply, thats a great help i was wondering though is there any specific 28mm carb if i know what sort to look for i can find one on ebay maybe? does it mater if its flatslide or round? thanks its not essential but for the full benafits you need a 28mm,there are many options but some carbs are easier to fit,personaly id find a nice hehinen pwk28 (flat slide) from a kr1s as this is what worked well on my big bore 125lc i had. another good carb upgrade is from a late dt125r (28mm and probaly a mikuni) another possability is a 28mm round slike mikuni fron a air-cooled rd400 |
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Post by tomitch on Oct 14, 2009 10:58:29 GMT 1
i just used the autisa barrel with a dt175mx piston i took 2mm off the bottom of the barrel and 1.5 off the top fitted a 2mm copper head gasket and took the head volume out to 21cc, 350lc allspeed pipe and a mikuni 28mm flatslide i think from a dt125r it will do a "ton" but runs out of revs ( still std gearing) the wheel will lift like a dream in 1st and carry on in 2nd if you can do the gear change before it has time to drop, or even dumping the clutch in 2nd around 6krpm will lift the wheel and hold at balance point, but i still have clutch issues, fitting a tzr 125 clutch is the next step for me.
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Post by twostroker on Oct 14, 2009 21:02:51 GMT 1
tzr or dtr clutch is the best way forward but i would try different gear oil or even a thin washer behind each clutch spring for now
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Post by ferret79 on Oct 14, 2009 23:07:49 GMT 1
thanks for all your help and info guys,
well today i have just brought a big bore kit from a friend, needs a lot of work but it will be worth it, and ive also brought a 2002 dt125r 28mm mikuni flat slide from ebay,
also waiting for my jim lomas expansion chamber with polished stainless end can to turn up..
i will try to get some pics for you of the big bore setup that i have brought and also the carb and exhuast when they turn up..lol
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Post by ferret79 on Oct 18, 2009 20:18:32 GMT 1
hi,
could anyone help me to find out the model of the new carb i brought for my rd?
as suggested i brought a 2002 28mm mikuni flat slide carb, which was originaly on a dt125r,
i cannot seem to find out what model it is, im tring to get a blown up diagram, and parts from mikuni websites but no having much luck.
also how do i get my throttle cable through the top of the flat slide carb, i know how it comes apart but theres the cable adjustment at the top of the carb and i cannot get a cable through it. and i cannot remove this throttle adjustment piece,
where as the original rd125lc throttle guide at the top of the carb comes aprt according to the haynes manual buy removal of a circlip. would i have to buy a dt125r throttle cable and it comes as one piece?
thanks for all your help.
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Post by carlos on Oct 18, 2009 21:24:55 GMT 1
Can you not fit the cable into the splitter piece??
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Post by tomitch on Nov 4, 2009 9:48:02 GMT 1
rd throtte cable doesnt have enough travel to lif the slide in the 28mm i made my own frm an rd and dt cable mash together my dt carb didnt have any markings on it eather to determin what it was i had a look on allens performance for one the same but no luck only similar looking ones
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Post by ferret79 on Nov 20, 2009 13:38:22 GMT 1
hi tomitch,
great a least i know i can make a cable work with it.
i now have a brand new dtr125 cable brought from ebay. could you possibly tell me how you put the two cables together?
cause looking at the dtr cable the carb slide end of the cable seems quite short.
many thanks mate
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Post by scrimsmustang on Nov 27, 2009 13:44:26 GMT 1
hi all, i am looking into a big bore for my rd, i know that one of the most common is a dt175 conversion. what i would like to know is, where do i get the parts to do it? and also what other parts would i have to change on my rd to get it to work, ie - conrod etc. where would i get the barrell liner from to be pressed into my rd barrell? also gaskets on any other stuff that is needed? hope someone can help me? many thanks Im not sure about this so maybe some one will let us know, would the topend from a 37F DT200 import the one that looks like the DT125LC MK2 fit the 125lc. Im not sure if the stroke is the same as a 125 on a 200 ? Its not on a crank induction 3ET DT200R the topend will bolt to a DT125R but thats it the stroke is different. A DT125R with a 170 Athena kit is barely faster than standard derestricted one i think. |
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Post by twostroker on Nov 28, 2009 16:08:28 GMT 1
when i had my big bored 125lc i found that with the 175cc top end it had more torque but didnt realy benfit greatly untill i fitted a 28mm flatslide and a exhaust that was designed exactly for the bore,stroke and porting of the top end,infact with a standard carb and swarbrick pipe mine ran mega hot and only made 13bhp at a charity dyno day,with the propper pipe and carb it used to rev out in all gears and lift the front wheel in second of power but i never got it re-dyno'd i expect 28 ish bhp certainly better than a standard one with a micron or allspeed
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Post by scrimsmustang on Dec 3, 2009 12:04:25 GMT 1
Im not sure about this so maybe some one will let us know, would the topend from a 37F DT200 import the one that looks like the DT125LC MK2 fit the 125lc. Im not sure if the stroke is the same as a 125 on a 200 ? Its not on a crank induction 3ET DT200R the topend will bolt to a DT125R but thats it the stroke is different. A DT125R with a 170 Athena kit is barely faster than standard derestricted one i think. Can anybody answer this or what......  |
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Post by racerd on Dec 4, 2009 2:24:51 GMT 1
Im not sure about this so maybe some one will let us know, would the topend from a 37F DT200 import the one that looks like the DT125LC MK2 fit the 125lc. Im not sure if the stroke is the same as a 125 on a 200 ? Its not on a crank induction 3ET DT200R the topend will bolt to a DT125R but thats it the stroke is different. A DT125R with a 170 Athena kit is barely faster than standard derestricted one i think. Can anybody answer this or what...... stroke is 57mm, |
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Post by racerd on Dec 4, 2009 2:29:28 GMT 1
rd throtte cable doesnt have enough travel to lif the slide in the 28mm i made my own frm an rd and dt cable mash together my dt carb didnt have any markings on it eather to determin what it was i had a look on allens performance for one the same but no luck only similar looking ones made mine throttle cable from a rear/front brake cable off a push bike the wire part then used a solder-less nipple for the end that fits in the slide on the carb |
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Post by scrimsmustang on Dec 4, 2009 13:26:04 GMT 1
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