[AceUK]

Next project will be a 500 Enfield. The 500 single isn't famous for power, I think in standard form it puts out about 25 horses over here.
Where would you start with these lumps trying to extract a few more gee gee's without going the head rework route. Its never gonna see the track but used for spirited road riding.

 

[Geeto67]

quote:
Next project will be a 500 Enfield. The 500 single isn't famous for power, I think in standard form it puts out about 25 horses over here.
Where would you start with these lumps trying to extract a few more gee gee's without going the head rework route. Its never gonna see the track but used for spirited road riding.

Hitchcock's (sp) over there sells Enfield parts and is the shop to see. They even built a 750cc big bore bullet out of a new one that was featured in Classic Bike a few years back. Supposedly they were bringing that kit to market but I have yet to hear anybody else that has one.

I think the first issue with the new bullet is to get rid of most of the indian parts for proper english ones. you'll find stuff starts to go rather quickly on these bikes and if you replace with goood quality engilsh and american repros those parts seldom break again.

http://www.hitchcocksmotorcycles.com/

Their site only lists 535cc big bore kits and worked cylinder heads but if you want to go larger give them a call.

For just bolt on stuff I would figure the exhaust and intake would be a good place to start, k&N filter and a perfromance exhaust will always help an engine. There is a lot on those bikes that is cast iron , replacing a lot of this heavy stuff with aluminum will go a long way to making the bike faster without internal engine mods. Swapping out for an alloy cylinder barrel will make a huge difference, as will the exhaust clamp and ditching the heavy muffler. small amounts of weight removed adds up over time.


Edited by - Geeto67 on Oct 16 2006 07:58:13 AM

 

[kenessex]

Ace,
I agree with Geeto. Go with a Mikuni carb an open air box{K&N filter) and a better exhaust. The other tthing to work on for faster street riding is working on suspension and riding comfort. If you want to keep up with your mates the trick is not to slow down. The thing to remember with a low HP machine is that any momentum lost will never be seen again until the next really long straight section. Handling well really helps in this regard.

Ken

AHRMA 412
Vintage racing - old guys on old bikes

 

[AceUK]

Cheers chaps. I'd heard that Hitchcocks were shutting up shop. Seems that I hear'd wrong. Amazingly some of their prices seem to have come down.
When the bike finally arrives I'll strip it and check it over. The standard carb will be dumped in favour of the Amal and a new exhaust will be fitted. Pound to a penny I'll find some cash for one of their flow'd and ported cylinder heads.

 

[Geeto67]

quote:
Cheers chaps. I'd heard that Hitchcocks were shutting up shop. Seems that I hear'd wrong. Amazingly some of their prices seem to have come down.
When the bike finally arrives I'll strip it and check it over. The standard carb will be dumped in favour of the Amal and a new exhaust will be fitted. Pound to a penny I'll find some cash for one of their flow'd and ported cylinder heads.

I don't know what is recommended for an enfield, but whay an Amal? My understanding is they are just ok(never used one, just trading off reputation).

Mukuni's are so much better. Older Harley Sportsters used to come with this flippin huge mukuni VM series carb. I rescued a couple of them from a harley shop dumpster a while back for a turbo application I had thought about doing but never got around to. Seems like the perfect 500cc single carb to me (a harley is a single carb v-twin with 1000ccs). Every old harley type shop over here has at least one they want to throw out (if they have been in business from the 70's). The old Kawi widomakers came with VM's standard and I really like those carbs - good for making power and simple to tune.



Edited by - geeto67 on Oct 16 2006 5:34:35 PM

 

[AceUK]

The old amal concentric mk2 was a "standard" tuning mod. Can still get them over here new for not a lot of money. Supposidly much better than the Mikcarbs fitted to the Indian Enfields.....plus the fact old Harley bits at affordable prices are like rocking horse manure over here.

 

[magnetoczar]

My buddy hops up Enfields. He uses Amals and a better ehaust, initially. He said there's a baffle right in the exhaust pipe, itself that he cuts out first and foremost. If you're really going to breathe on these engines, install a Carrillo rod as the Enfield rods aren't all that good.

Dgy

 

[joe c]

aaron runs amals on his 175 honda. he can tell you all about them. hes the amal mikuni historian here.

jc