Royal Enfield 500 Red Baron with retarded inlet cam timing discussed.
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- čas přidán 13. 09. 2024
- Already seen in some earlier videos, after discussions with the owner, it was decided to retard the inlet cam timing by one tooth. This has the combined effect of making kick starting easier, mid and high RPM range power is increased [with a very slight loss of low speed power] and reduced likelihood of any tendencies towards pinking. The owner has asked me to point out that the 'strange' paintwork is a result of him test spraying with camouflage paint, to get an idea of how it might look on the bike.
I retarded in inlet on my 350 yesterday after watching another one of your vids.
I was quite shocked it felt like the bike had lost compression.
It was so easy to kick over compared to std timing.
Runs like a good 'un
Good advice
Thanks - glad you are happy with the result!
Very pleased.
If anyone wants to know if this works on a 350 too, it appears so.
Mines got a mildly ported head and a high compression piston, free flowing exhaust and air filter.
It's easier to start and revs more freely.
@@hotshot2177 It definitely works on a 350 with higher compression than standard, but a totally standard 350 machine might not cope too well with it.
I'm gonna try this the next time when I open the timing side. Thanks for this hint!
It is certainly worth a try!
Well done Paul, I'm sure that will be a good tip to a lot of owners with the same issue. I'll share that with my pal Scotty.
Thanks 👍
Sounds good and proper. Still looks a bit like it was parked under a pigeon roost for a several months with that partial primer grey atop the tank. I heard recently that retarding that stock intake cam a tooth is also a good idea--nay, a requirement unless a different cam is fitted--for those fitting a domed or high compression piston like a 535. That alloy barrel's said to be a sensible upgrade for improved cooling,
Thanks, Bill. Another good reason for retarding the inlet cam when a high compression piston is fitted is it will reduce any likelihood of pinking [pinging].
Hi Paul. I had a 2004 Export (Australian) Bullet 500 with the Accralite 535cc high compression (8.5:1) piston. Compression test its at 125psi. Previous owner said it's got 2 thin gaskets to lower it, but it's still very hard to kick over.
Running a Mikuni VM32 round slide, the open rectangular airbox and a freer flowing exhaust.
Pazon Electronic Ignition (like Boyer, but from New Zealand, little better designed)
Although it has a little bit of detonation/pinging just coming off tick over to around 2000rpm then clears up. Somewhat like a "tink, tink, tink" in time with the increasing rpm then clears up.
I'm guessing retarding the inlet valve timing should somewhat remedy this from your explanation from the other videos also. With the larger carby sounds like it would be a good mix the the later "kick in the pants" like the older British models?
Thanks mate.
Ben
Hi Ben, it certainly sounds like retarding your inlet cam should help, as possibly, would raising the needle in the carb a notch - got to be worth a try!
@@paulhenshaw4514 Great, hopefully it helps. Definitely made it easier to kick over. That 535 Hi comp piston is a lump.
I've tried raising the needle, it was more so in the range of the slide cutaway. Which I've change from a 3.0 to a richer 2.5. It's cleaned up a "cough" it would have and the throttle response is better.
I re-phased the cam as you do, It is a lot easier to kick over and idles a little more nicer. But doesnt like a very slow tick over or you lose throttle response.
Just can't ride atm, wating for the front wheel to come back from getting the new hub getting machined, was a bit egg shaped!
I see this is an older video, but if you’re still answering questions, I have a couple. Is there ever any kick back when starting with the radically changed cam timing? And what would you consider to be the maximum safe RPM for one of these engines with the stock bottom end? Thank you in advance.
Hi Keith, any kick back wouldn't be as harsh and it is easier to kick them over with the later inlet timing. 5000 rpm should be fine, with the odd burst of a bit more.
Hi Paul I believe that Royal enfield are ceasing production of the 500 Bullit after 80 years! I do like them but I expect prices to rise now
I doubt it - they have made millions of them over the years!
Will retarding tje inlet cam on a stock pre-unit 1:6,5 give any positive difference?
It should work to a degree on a 500 in standard tune, but a 350 just becomes gutless unless revved flat out everywhere.
@@paulhenshaw4514 I tried it, missed bottom power and could not notice 'really'improvement in the upper range. 500 bullet, 30mm carb and flowed head..
Right now it is happy with a 18T sprocket, enough power also with strong wind ahead. Would a 1:8,5 piston instead of the 1:6,5 give enough to pull 'responsibly' a 19T sprocket?
Sir would you be kind enough to give a way to contact you, i need few things to discuss 😁😁😁
Don't expect 😀
Hi Paul, is the compression ratio on those older models as low as on the later models which is about 6.5:1!
Hi, pretty much so, although some British variants could have high compression pistons, going as high as 10:1 !
Would this be an advantage with the Redditch 350 and 500 engines ?
Possibly, although the Redditch engines have better timings to begin with.