Hendrix's rifle Posted May 4, 2017 Report Share Posted May 4, 2017 Stripped it down cleaned it all up rode it lively and I had no oil out the breather BUT the pig dropped an exhaust valve and snaped it and gauged the valve seat,just bought a second hand one will fit when it arrives. Im buying a two-stroke next Was it ring gaps then? Quote Link to comment Share on other sites More sharing options...
Hendrix's rifle Posted May 4, 2017 Report Share Posted May 4, 2017 (edited) I feel your pain ☹ I had a 2007 exc 400 that dropped a valve, was on full chat at the time...... It was terminal Oops.... I did something similar to my xr250r, the last of the model aswell. New hotrods crank with high comp oversized titanium piston with hotcams of the aggressive nature, oversized valves and double valve springs. Went like **** off a shovel for half an hour before it popped. Rebuilt it then the cam chain and tensioner let go... cost me £1300 or so In total. Absolutely devastated. Used said smashed piston, cut the skirt off it and made it in to a heart for the mrs, last year. We built our relationship on her sitting in the garage with me every night building and tinkering with that bike I feel your pain.Ps, all the parts had to be imported from America, with the exception to the cams! 2 pistons, 1 crank and rod, 1 set of cams, genuine chain and tensioner, 3 wiseco composit gasket sets and 10 valves in total and a lot of swearing and waiting for bits Oh dear it does look bad. Mine not too bad I can recycle my old piston use the new rings and fitting a good used head and valves, new ones are £100 a pop,I'm definitely going two-stroke next, will just have to learn to use the rear brake,it's not that bad as my mate has broke his wrist whilst on the trials bikes so been borrowing his 250 exc. If I ever get rid of the 525 il be going 300exc, maybe even the husky 300 Edited May 4, 2017 by Hendrix's rifle Quote Link to comment Share on other sites More sharing options...
Me matt Posted May 4, 2017 Report Share Posted May 4, 2017 I could off fashioned tons of keepsakes out of this lot ? was the entire contents of the bottom end after I opened it up Quote Link to comment Share on other sites More sharing options...
Gordon R Posted May 4, 2017 Report Share Posted May 4, 2017 Hendrix's rifle. I found your information very useful - it wouldn't have occurred to me to check the ring gap. My youngest is running a KTM SX-F 450 - I wish he would go back to two strokes. Four strokes are an expensive repair bill waiting to happen. Both my lads had moto-crossers - - big two strokes - KTM SX360, KTM SX380, three Honda CR500s - only replaced a piston and a couple of gears in the CR500. Had a 610 Husky - cost an arm and a leg in parts - 6 valves at £140 a throw. Piston £150, piston ring £150, cam chain, barrel lined - all about ten years ago prices. Quote Link to comment Share on other sites More sharing options...
Hendrix's rifle Posted May 4, 2017 Report Share Posted May 4, 2017 (edited) Hendrix's rifle. I found your information very useful - it wouldn't have occurred to me to check the ring gap. My youngest is running a KTM SX-F 450 - I wish he would go back to two strokes. Four strokes are an expensive repair bill waiting to happen. Both my lads had moto-crossers - - big two strokes - KTM SX360, KTM SX380, three Honda CR500s - only replaced a piston and a couple of gears in the CR500. Had a 610 Husky - cost an arm and a leg in parts - 6 valves at £140 a throw. Piston £150, piston ring £150, cam chain, barrel lined - all about ten years ago prices. Glad it helped, sometimes another perspective on things can help I find. I agree with the repair bills but the 4 strokes are that torquey and have that much power it seems daft not too. Especially in mx. If enduro 2 stroke is the way to go, powerful enough and as light as a fag packet. That husky sounds expensive... very expensive the new 701 with a pipe and power commander looks awesome!! Edited May 4, 2017 by Hendrix's rifle Quote Link to comment Share on other sites More sharing options...
Gordon R Posted May 5, 2017 Report Share Posted May 5, 2017 My youngest uses the bike for practice, having retired from racing after breaking tibia, fibula and shoulder blade. Eldest retired after he broke his back. A two stroke 250cc would haul my lad around a practice track - he says it wouldn't have enough power, as he weighs around 17.5 stone in race gear. I like the look of the two stroke 700cc Maico. Quote Link to comment Share on other sites More sharing options...
Rimfireboy Posted May 5, 2017 Report Share Posted May 5, 2017 Had a couple of maico's. The 440 was awesome, couldn't really thrash it because it would spit you off. The big two strokes had loads of power and seemed to hold together pretty well. Four stroke big singles eventually kill themselves due to vibration, even with balance shafts they still do it. As good as the modern stuff is, chances are that they'll let go eventually, and then it's looking like big money time. Could be said for all of them I know, it's just that there's more moving parts and more to go wrong. Quote Link to comment Share on other sites More sharing options...
bornfree Posted May 5, 2017 Report Share Posted May 5, 2017 i had a 250 maico it was a lovely bike to ride. a mate had a cr500 and it was pure evil it just wanted to kill you. Quote Link to comment Share on other sites More sharing options...
Albert 888 Posted May 5, 2017 Author Report Share Posted May 5, 2017 Was it ring gaps then? I left the ring gap, cleaned the bore as much as I could,started it and rode it lively straight away,no letting it Idle,was going well until it ate the exhaust valve. Quote Link to comment Share on other sites More sharing options...
Albert 888 Posted May 11, 2017 Author Report Share Posted May 11, 2017 Woop woop bike now fixed,Secondhand head and valves fit reshimed wires sorted and it now starts off the button, it was a pig to start before. It's not blowing any oil, just need to change the mineral oil to fully synthetic and a few minor job and I'm back on it. Quote Link to comment Share on other sites More sharing options...
Hendrix's rifle Posted May 11, 2017 Report Share Posted May 11, 2017 Woop woop bike now fixed,Secondhand head and valves fit reshimed wires sorted and it now starts off the button, it was a pig to start before. It's not blowing any oil, just need to change the mineral oil to fully synthetic and a few minor job and I'm back on it. Happy days Quote Link to comment Share on other sites More sharing options...
TIGHTCHOKE Posted May 12, 2017 Report Share Posted May 12, 2017 Great to hear that you've sorted it! Quote Link to comment Share on other sites More sharing options...
Rimfireboy Posted May 12, 2017 Report Share Posted May 12, 2017 Nice one Albert, now you can enjoy the ride grinning all the way fella.... Quote Link to comment Share on other sites More sharing options...
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