tm125 dg head

[brad747]

How about this?
Can any one tell me if this is rear or not??? and does it give you extra power or just the trick look??

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&mfe=sidebar&viewitem=&item=330242836799

[Doc]

The DG 'cast' radial heads for a TM125 are indeed rare Brad. As for performance gains it's very minimal and nothing spectacular but it's the bling factor that will push the price up. Webco are about the best TM replacement head (apart from stock) but they don't have the nice looks of the radial type.

[lukeb1961]

I don't know about the TM Doc, but on the PE175N the DG head pushed up the compression by a point and had larger finning. I very definately notice the difference when I put the DG head on!

[TM BILL]

I got one of these on one of my TMs only good for bling and heavier than standard 

[LWC82PE]

well there you go, on a PE 175 they do work . you must use high octane fuel to take advantage of the higher compression ratio though. i bet many guys dont do that, so the bikes ping like s**t and dont go any better then with the stock head and thats why you always see used DG heads with pitting and melting in the combustion chambers.

[TM BILL]

So will this one fit my PE 175 http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&mfe=sidebar&viewitem=&item=330242836799 

[lukeb1961]

nah - 4-bolt on TM, 6-bolt on PE.
see http://members.optusnet.com.au/pe175n/Engine/DG1.jpg for the PE head

[Doc]

 

[lukeb1961]

all I'm saying is that I heard people say that a DG head made no difference - yet when I got hold of one, I found it was, really, a noticeable improvement - at least the one for the PE175 C/N.

[oldfart]

By putting in a thinner head gaskets is a cheaper option 

[pokey]

Any difference with the squish band or is it just a straight copy of the stock item with radial finning?

 seems a lot of cash for bling specially if its heavier with no actual performance increase

[crs-and-rms]

i like them for the bling look and im not ashamed to say so when i was young i always wanted one .i have two of them one for my  rm 125 n and one for my rm  125 t i also have a webco head for my rm 250 b they are much better for performance and cooling but are hard to find

[Doc]

On vintage MX bikes like TM, CR's, MX's etc an aftermarket head will not give you any 'feel it in the seat of your pants' type power increase. The bumping up of compression is common and 'may' make the bike a little snappier down low to ride but it's a trade off, this extra compression alone will not increase much except the bang factor. Aftermarket heads are heavy compared to stock and $ for $ the money would be better spent on a pipe or decent porting. Have a looky at these pages below I posted ages ago. Maybe with PE's and other non MX machines the difference is a more noticable but for a TM it's near all bling with little if any improvement. I run the T&M head personally but it's all looks 


http://www.vintagefactory.com/Elsinore%20Head%20Test.jpg
http://www.vintagefactory.com/Elsinore%20Head%20Test%201.jpg
http://www.vintagefactory.com/Elsinore%20Head%20Test%202.jpg
http://www.vintagefactory.com/Elsinore%20Head%20Test%203.jpg
http://www.vintagefactory.com/Elsinore%20Head%20Test%204.jpg
http://www.vintagefactory.com/Elsinore%20Head%20Test%205.jpg   

[pokey]

thanks Doc, good read.
Seems the aftermarkets dont have much on the stock head cept a few had better cooling  and the only reason to fit one is if you picked it up for a relatively good price.

[Doc]

that's the general impression I have on aftermarket heads too Pokey and yup, that little nos T&M unit above cost me about $80 all up. I baulk at anything over a $100 The aftermarket heads may cool down quicker between races but that's irrelevant now as the bikes are 30 years old and rarely get ridden for more than 10 minutes on full noise. The cooling time not such an issue. Be different if they kept the bike cooler when running akin to watercooling temps but again in 10 minutes it ain't going to make bugger all difference. It's the weight factor that I dislike the most about most of them. The Webco heads do cool great (apparently) but they weigh twice as much as the stock head (factually) and all this weight is up high where it is unwanted. The thermal flow type Shinobi heads look super bling too but when you feel the weight of the head/rad/pipes and fittings you'd be fighting an uphill battle adding this much weight to a bike and then adding another kilogram of water on top of it all. Again it's all up high and not advantageous. I have to admit I really do like the look of my TM head and the FMF porcupine styles but they don't do much else. Reshape and polish up the stock item and you'd be onto a better thing