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Post by tomitch on Aug 8, 2008 23:32:08 GMT 1
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Post by tomitch on Aug 9, 2008 9:58:03 GMT 1
Cheers jazzyj the ad says its an autisa piston kit so it should be ok.
Im deffinatly getting the big end bearings replaced. £100 sounds about right, i phoned grampian and they said £110 for rebore new piston and crank re-build because i do have another autisa bigbore i just dont have the piston and it was a pain trying to find one that would do
I think the dt 200 was the closest but the skirt would have to be machined down.
Thanks for your help
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Post by Norbo on Aug 9, 2008 10:57:18 GMT 1
I have a full rod and bearing kit you can have for £30 put that on your crank and all will be fine.
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Post by mellow on Aug 9, 2008 13:12:17 GMT 1
DAMN!!!  i was watchin that kit  didnt wanna pay the buy it now though ;D |
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Post by Deleted on Aug 9, 2008 18:03:31 GMT 1
why would you want to put a Mk1/2 big bore kit on a Mk3?
for the same amount you payed you could have had the (much better) standard barrel 'tuned' to give the kind of benefit that the big bore will give (and that is not much either!)
the oval ypvs barrel is a far better piece of kit that the square one. it can be played with (fettled/tuned) much better than the Mk1/2 jobbie, while still giving very good reliability.
now you have to put a MK1 con-rod kit on (everything too seals, bearings and big end) just to keep it reliable if not then a seize is imminent. the overall cost (to me) simply does not warrant the conversion where as a mild tune for the same money would have and no fear of seizing.
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Post by tomitch on Aug 9, 2008 18:39:03 GMT 1
jamietzr250r:-
I was doing a full rebuild anyway so new seals and bearings were going to be fitted also my mk3 barrel would have needed a re-bore and new piston and the exhaust stud drilling and helicoiling so by that point just the re-bore and piston would have cost me £50/60 and i cant belive that even a tuned mk3 barrel would give me as much torque as the bigbore. Id also have the satisfaction of saying i own a bigbored rd lol.
lol yer the mk3 that you own 3/4 of rob lmao
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Post by Deleted on Aug 10, 2008 21:35:55 GMT 1
lol yer the mk3 that you own 3/4 of rob lmao which rob? (yorkyam? then yes hes a dealer where else do you get parts and not 3/4 more like 1/16.) as as for power yes you can get the same if not more from the Mk3 head verses the Mk1/2 even with a big bore. |
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Post by tomitch on Aug 10, 2008 22:55:35 GMT 1
jamietzr250r
LOL Rob i think hes on the yamaha-rd.com forum as bladerunner and the same on the rgv forum he lives down the road he use to race rgv 250's.
Well to be honest no amount of tuning will give you more cc, now if i was to tune the bigbore that would make a big difference compared to the mk3 i was just compareing the mk3 head and the mk1/2 head from a dt and the mk1/2 has actually got a better squish than the mk3 !!
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Post by twostroker on Aug 11, 2008 7:15:16 GMT 1
what i would of looked in to is the slightly differnt approach of getting the 66mm bore size liner fitted to your mk 3 barrel by an engineering firm like fahron,this way you could use the standard mk3 rod kit and you also have the option of running the full ypvs electric servo kit.
what carb and exhaust are you planning to use?
saying that, ive never seen it done before so perhaps its not as simple as i think
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Post by twostroker on Aug 11, 2008 7:16:24 GMT 1
i would defenetly use pre-mix too with the big bore kit
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Post by tomitch on Aug 11, 2008 19:48:55 GMT 1
twostroker
iv got a 28mm powerjet carb i think its of a tzr 125 and iv also got a micron pipe but i was also thinking of trying a rgv 32mm carb and see what happens. isnt the re sleaving process a lot of money and i havent got a servo kit or a mk3 loom any way it just had a mk3 top end fitted when i got it
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Post by twostroker on Aug 11, 2008 20:38:49 GMT 1
twostroker iv got a 28mm powerjet carb i think its of a tzr 125 and iv also got a micron pipe but i was also thinking of trying a rgv 32mm carb and see what happens. isnt the re sleaving process a lot of money and i havent got a servo kit or a mk3 loom any way it just had a mk3 top end fitted when i got it the re-sleeving process isnt that expensive,fahron did my mk2 top end and it wasnt a great deal more expensive than a second hand barrel,rebore and jap piston kit that i needed as my original top end didnt have enough liner left to re-bore.the other bonus of having it done is you can have it tuned to the spec you want. as you have got the autisia kit i would just stick with it now estecialy as you have got the mega rare copper casget and its got the head machined (they just used the standard head originaly) let me know how you get on |
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Post by twostroker on Aug 13, 2008 7:11:22 GMT 1
i would like to run a 32mm carb but unfortuantly a 32mm wont fit in the standard inlet rubber,maybe somebiody like allens performance sells bigger inlet rubbers?
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Post by twostroker on Aug 17, 2008 21:35:10 GMT 1
im running a similar set up,im using a stock bottom end (untill it lets go)firstly a standard size dt175 piston fits a standard 66mm bore so if yours is bored out go up 0.25mm or what ever needed),you will need a rd400 little end bearing as the 125lc one is too narrow,next time i remove my barrel im going to mod it to fit a v-force reed block.
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Post by tomitch on Aug 17, 2008 23:43:46 GMT 1
cheers for your help guys when the kit arives (paypal are being stupid they decided to send an Echeque to the bloke) ill get bladerunner to get the verniers on the piston and meassure everything possible lol and whatever else needs measureing the advice about the rd400 small end bearing is very helpfull to know any other things you discovered when you fitted yours??
Cheers For the help guys !!
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Post by twostroker on Aug 18, 2008 20:46:01 GMT 1
its probaly been said before but always fit a decent jap piston kit.genuine rd400 bearing was only £3 or £4 i think
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i was watchin that kit 
didnt wanna pay the buy it now though 
