tm125 dg head

[pokey]

Bought a odyssey which had  DG  Gold anodised head on the , went like stink and looked trick  but i suspected the head was just bling like most of the stuff from DG . still got hot after a good session in the mud.

 Those porcupine heads do look good  but only ones ive seen are out of my price range . think I will stick with a stock head  unless i find am ocelot or such being used as a door stop

[lukeb1961]

My DG head was zero cost (gift; had been sitting in a shed for 25 years) - so bling and some perf increase at zero cost was nice!

[firko]

I know taste is a personal thing but I reckon that those gold anodized DG heads look ugly. Whetherany of those aftermarket heads actually work is doubtful. I tried GYT, DT2MX, Webco and a modified stocker that I'd totally filled the combustion chamber with weld and then Peter Reynolds had designed a combustion chamber to suit the Gary Treadwell porting and Peters own pipe. The first three heads showed no improve in performance at all and the modified head showed a bit more punch down low but not enough to warrant the hours of work. We came to the conclusion that the combustion design design isn't as critical as some gurus will tell you.

[pokey]

Interesting hearing the experienced. with the small bores im thinking weight to be a big issue and if its only a few laps  i cant see heat being that big of an issue .

 i guess if you dont have a budget and are racing for sheep stations yeah get a good head and tune for it to get the maximum amount of performance but sheesh aint VMX all about a bit of fun ? tis for me .

[lukeb1961]

I know taste is a personal thing

Got it in one. I think they're absolutely right and look great. It certainly makes a difference on the PE175N. I don't have to doubt it. I know first hand and it has nothing at all to do with the chamber design. Doc knows they make no difference on the TM so that's excellent info. As to combustion chamber design, I'll go read Blair or Dixon and listen to Lozza's opinions too :-) All fascinating stuff. It'd be a ton cheaper and easier to go on a diet if you wanted to go faster, of course!

[Lozza]

Geez Luke hope your not putting me in those blokes league are you???  If your under the impression that head design has no influence on output HRC, VHM,KTM and even Treaders mate Brian Stockman are all wrong then. I can tell you on an RS 125 we have run 17.5:1 compression with no dets(it killed over rev & a bit of top end though), had enough drive of turns to leave a GSX-R750 for dead. Head design and shape has a big influence but it's not in the way you might think.

[Doc]

Luke the performance felt 'exactly the same' with or without the aftermarket head. I am not saying they don't work I am just saying you won't notice any performance gains fitting an aftermarket head to a TM125. The extra weight doesn't justify any extra cooling properties for a bike ridden for such short periods. If 'anyone' can design a head that will give me a 'felt in the seat of my pants type power increase' for a TM125 'without' simply raising compression and running hi-octane fuel I'll stand corrected 

[Lozza]

If you supply the pistons it's easy no problems