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Post by tomitch on May 17, 2009 22:07:11 GMT 1
jst got my 125 lc running today with the bigbore (dt175 piston all machined propperly) and it ran ok at first then it would struggle to hould revs under 5k rpm and just dies this was the reason i got the barrel rebored, i thought the old piston was knakerd but now it turns out this isnt the case.
So far i have checked
new plug
new ht coil
resistance on coils are within tollerance
The olnly thing i can find is the fly wheel will rock backwards and forewards on the crankshaft when i loosen it the woodruff key looks to be too narrow and doesnt fit snuggly in the crankshaft.
has anyone had any similar issues ??
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Post by tomitch on May 17, 2009 22:09:31 GMT 1
forgot to say, she will backfire and pop when i try to start her and is very hard to bumpstart but will occasionally run fine for a while
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Post by tomitch on May 17, 2009 23:36:41 GMT 1
ok ill try that after work tommorow and see if i can order a woodruff key from some where
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Post by Dirtbag on May 18, 2009 0:03:05 GMT 1
Have you upped your main jet size.....to match the increase in cc ? Its surprising how many people do forget  But you will definately need to sort out the ill-fitting woodruff key good luck |
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Post by tomitch on May 18, 2009 8:16:46 GMT 1
Yer jetting is fine and carb is clean
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Post by twostroker on May 18, 2009 18:52:11 GMT 1
Yer jetting is fine and carb is clean when i had a stock 12a carb i used a 240 main,so yours should be similar,mine never coughed or spluttered but the small carb certainly restricted the power from the 175cc top end,mine ran spot on from 1000-8000rpm but wouldnt produce more power if reved higher,id say try another carb if you can and make sure you have got no air leaks from where you have converted to pre mix.also try 40:1 mixture if your not allready . id hunt through ebay for a single pwk28 carb mate pretty simple mod and made a world of difference to mine.infact probaly one of the best mods i did,i tryed 3 or 4 standard carbs and they all had issues that caused grief |
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Post by tomitch on May 20, 2009 20:45:41 GMT 1
just tried my mates woodruff key and thats fixed the problem the one i had was half a mm too small
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Post by ferret79 on May 25, 2009 19:09:20 GMT 1
i had the exact same problem with mine, but it kept sheering my woodruff key clean off, put a genuine key in there and all was fine,
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