Speedfight bottom end engine cast breaking!

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I have got a speedfight 100cc and today i hit a small pot hole at about 30mph and the cast bracket on the lower end of the engine has snaped off, this bracket is the support for the exhaust pipe.
i know if i cary on riding it like this, the exhaust wil snap at the manifold so i need this part fixing.
is it easy to fix and/or does it mean me having to replace the whole bottom end of the engine?

big2dave · Scooby Slapper Joined: 20 Jun 2004 Karma :

weld it up where theres a way there is a bogie too this bogie will last tho i think
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bikedudextrm · Traffic Copper Joined: 16 Oct 2003 Karma :

This is a common problem, i've seen people riding speedfights with both the mount bits broken so only the cylinder exhaust bolts are holding the whole exhaust on. Just get it welded back on.
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michael · L Plate Warrior Joined: 12 Aug 2004 Karma :

i have the same problem mate wi the exaurst bracket only i didn't no the mount add snapped and then the exaurst snapped off abit after i think the engine casein is cast ion tho isn't it and you cant weld cast ion as anyone add it welded? if i cant get it welded am gunna make my own bracket for the exaurst and put it to the frame someone write back and let me no cheers mike.

michael · L Plate Warrior Joined: 12 Aug 2004 Karma :

i have the same problem mate wi the exaurst bracket only i didn't no the mount add snapped and then the exaurst snapped off abit after i think the engine casein is cast ion tho isn't it and you cant weld cast ion as anyone add it welded? if i cant get it welded am gunna make my own bracket for the exaurst and put it to the frame someone write back and let me no cheers mike.

binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

I have had the same problem with my Speedfight too. i was driving one day and next minute all was rattling and i realised my exhaust mount had snapped. i made a bracket out of 5 ml steel and attached it to my stand mounts. i bolted the pipe to this. if you do this method, make sure you support the pipe with TWO bolts otherwise the exhaust uses the single mount as a pivot and the pipe snapped at the manifold. if you decide to get the broken piece replaced. its a part of the casing of the cam shaft, so the engine will need splitting and rebuilding. this is like 60 minutes labour. which ain't cheap. i think this is a popular fault with the speedfights. and if you have a AIR cooled. BEWARE!!!! because in the summer, the piece what snaps off is a part of the fan casing. and it leaves a big hole when not there, and the engine dosen't cool efficiently. my barrel overheated and blew up twice, so i went out and got another Speedfight. L/c... Mr. Green

michael · L Plate Warrior Joined: 12 Aug 2004 Karma :

my speedfighter is watercooled anyway that peice what snapped off the engine is only aluminum i think so i think it could be welded do you have a digital camera coz i wanna see how you have made this bracket coz i think am gunna make a bracket as well as get it welded coz i bought a twin race wipe a couple ov week ago it cost £210 and when the mount as snapped its snapped the axhourst as well coz the exaurst is a twin one and quite heavy how fast dose yours do?i can get 63 out ov mine on flat and about 73 downhill and that is pusshin it lol. mike. Very Happy