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Post by chrisk01 on Mar 3, 2017 9:54:12 GMT 1
hi, I'm looking at these on eBay, I've asked the guy if they are from a 31k, f1,F2 etc link
Whats the general consensus about microns? I think I read somewhere that they are difficult to set up? chz |
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Post by midlifecrisisrd on Mar 3, 2017 10:16:47 GMT 1
Bare will tell you you don't need to jet them but don't know if it's an atmospheric thing on this side of the pond but most need to mess around with jetting/needle position.
Most complain of a stutter at 5.5k or them seizing on long high speed runs with standard jetting
Had a set back in the day and was driven mental by the flat spot at 70 in top
They do make good power up top but rev hungry and rev very high so ring life not the best
Personally on a ypvs I think they hang too low. It's like it's the exact same pipe as lc but they fitted a longer hanger bracket to reach the rear mount.
Steve
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Post by essexblue on Mar 3, 2017 10:54:54 GMT 1
I have had allspeeds and currently have microns on the same set up as the allspeeds.
K & N filters, bigger jets and they run fine
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Post by lolly on Mar 3, 2017 11:23:41 GMT 1
i had a pair of those on my 4lo ; I didn't change the carb settings and it ran ok ; eventually changed them because I did not like the sound ; to deep ; sounded like standard pipes with the baffles removed .
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Post by lolly on Mar 3, 2017 12:12:50 GMT 1
i had a pair of those on my 4lo ; I didn't change the carb settings and it ran ok ; eventually changed them because I did not like the sound ; to deep ; sounded like standard pipes with the baffles removed . Was that with standard air box ? everything standard ; engine ; carbs and air box . |
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Post by headcoats on Mar 3, 2017 12:19:02 GMT 1
Look horrible and sound horrible  |
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Post by 4l04ever on Mar 3, 2017 12:36:43 GMT 1
The Microns match very well to a standard 4L0 engine. I have a blue printed standard engine with Microns and Zeeltronic in my trackbike. Make a strong 48hp. They do not rev very high on the 4L0, which is a good thing when trying to extend crank life.
I think the Microns scored 2nd highest in MutssNuts Exhaust tests.
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Post by lolly on Mar 3, 2017 12:43:48 GMT 1
Look horrible and sound horrible +1 |
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gaspard
L plate rider.
If your not confused, you don't know what's going on.
Posts: 38 
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Post by gaspard on Mar 3, 2017 12:47:34 GMT 1
I had small can microns on 250 and 350 LC's.
Didn't like them on the 250, as it wouldn't pull through the Rev range until it hit 6.5k, upon which it would go mental.
The 350 had enough torque to pull through, shifted the power delivery further up the Rev range, and felt like more power, but could have been because of a steeper power curve?
I,m about to put a set on a 4LO again.
I always jet up at least on size - sometimes two. I like to rev them.
Fiddling with needle position does make a difference.
Down to personal preference I guess, but I love the anti-social sound and feel.
Good luck
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Post by foxyjohn on Mar 3, 2017 17:01:28 GMT 1
Microns are like Marmite you either like them or you dont I think they are one of the best sounding pipes made for a 2 stroke they hang a bit low at the back but that gives them the old skool luck there are 4 types of Micron the very 1st type can cause the front of the piston to over heat and seize due to the thin stinger I ran the second type on my 250 LC with standard set up carbs with no problems I am running some of the second type now on my Fahron 370 and this had a flat spot between 4500 and 5000 rpm I was advised to remove the airbox lid and up jet I did this and it cured the flat spot it makes good power but does want to rev into the red hth
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Post by tony1964 on Mar 3, 2017 17:13:07 GMT 1
I have them on my 31k, standard jetting, take the wadding out and they sound ok, the ones on ebay don't have the flanges on them so you wont be able to bolt them on.
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Post by tony1964 on Mar 3, 2017 17:14:38 GMT 1
ignore the bit about the flanges, just seen the last photo, doh.
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Post by chrisk01 on Mar 3, 2017 17:50:04 GMT 1
Hmm, lots of opinions... would they fit an F2?
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Post by tony1964 on Mar 3, 2017 18:08:56 GMT 1
When i got my 31k it had std F2 pipes with modified cans, they weren't sitting right on the hangers so i removed them and noticed it had 2 exhaust gaskets on each pipe, i left one gasket out and the were ok on the hangers but flopped about when bolted to the barrels, i would say they wont fit an F2 but maybe i'm wrong.
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Post by bare on Mar 3, 2017 18:37:35 GMT 1
Hmm, lots of opinions... would they fit an F2? Dunno? I do know they fit My LC with yvps ...poorly. No, not the 3/4 " mount bracket hole offse .. IMO the brackets are poorly located I have 2 pairs, both with similar 'issues', so likely not an anomaly. Cut off, remade fresh brackets, positioned the pipes to a ..perfect fit.. then rewelded the brackets in place. Now they fit perfectly.. 1/4" clearance ..everywhere..pipes also (Now) slide on their engine flange stubs with rpms/loads.. Just like the ones on my TZ's did. Ever wonder what those springs are actually for? Well worth doing the proper fit mod .. but it's a one or 2 day job by the time it's ridable though. Power seems good, as engine keeps pulling harder and harder until it hits the limiter (10.5k) which I've set too high for engine life. PS; No upjetting req'd on MINE. Helluva noise at wot high rpms though. Not nearly as acceptable today as it was 30 years ago. Likely not overly clever to let Officer Friendly know your exact position.. at all times. |
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chrisk
Drag-strip hero
Posts: 281
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Post by chrisk on Mar 3, 2017 20:16:14 GMT 1
I have the micron gp pipes, from a forum member.
I actually did not know what gp pipes were when I bought them..I had no idea they went up one side, I just thought they looked nice in black chrome.
Anyway popped them on one night..and within two miles blew the head gasket.
I had been running gutted airbox and 300 mj with everything else standard. With the gp pipes I ended up at 380 mj. Bike pulls very well, with good increase in midrange.
Start high and come down.
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Post by 4l04ever on Mar 3, 2017 22:17:01 GMT 1
Dyno for my track LC with Microns fitted. 3 curves for different airbox lids, but best ones showing around 48bhp :-)  This bike :-  |
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Post by veg on Mar 3, 2017 22:32:50 GMT 1
Microns were the spannies back in the day (yes you allspeed fans) they were but there are loads of better pipes available today
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Post by 4l04ever on Mar 3, 2017 22:37:03 GMT 1
According to Muttsnuts exhaust dyno test, Microns are 2nd best, only to TSA pipes.
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Post by veg on Mar 3, 2017 23:02:04 GMT 1
According to Muttsnuts exhaust dyno test, Microns are 2nd best, only to TSA pipes. [ Kennys pipes are better I lied there are only 1 pipe kennys 😀 |
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Post by Eyrey1 on Mar 3, 2017 23:27:23 GMT 1
my ypvs went really well with microns on
you followed it on 2 stroke run chris they are good pipes
ring mutts he can get some pipes i think but not microns
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Post by veg on Mar 3, 2017 23:55:22 GMT 1
Pv are different I had arrow pipes possibly the best pipes I ever had 👍
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Post by roddy675 on Mar 5, 2017 0:58:11 GMT 1
Planning to get my 250 on the Projex dyno this summer to cure my micron sink hole.....
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Post by bare on Mar 5, 2017 2:30:27 GMT 1
Microns were the spannies back in the day (yes you allspeed fans) they were but there are loads of better pipes available today Erm NO.. TSA's are better.. but not by that much. And TSA's ARE best of Breed. All bleats to the contrary aside. Physics hasn't varied significantly...over the years Al;speeds are poser pipes. Barely better than OEM Yama mufflers |
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Post by veg on Mar 5, 2017 7:37:32 GMT 1
ERM you are repeating what I acknowledged
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Post by jon on Mar 5, 2017 11:25:55 GMT 1
There were 2 different types of the later bolt on endcan, the ones shown in the link, and some 'mechanical' mufflers. These had a straight exiting almost trumpet like end, rather than the ones above which were conventional straight through with wadding and a curved end.
I'm not too keen on the sound and weight of the mechanical ones, although I do quite like the quietness of the convential ones on a YPVS (much more plod friendly IMO).
In fact I bought Mellow's old ones after he switched to Kenny's. I quite liked the sound after following him in places on our way up to Gibson's dyno day a couple of years ago. Later I bought a 10 footer YPVS with some horrible 'home made' stainless pipes that were way too loud, so needed a quieter set before I'd even attempt to ride it.
I'm not after performance on this YPVS, but from memory the same pipes on my old YPVS seemed not to have any more power, but reach peaks revs quicker than the standard ones.
So in summary IMO, small improvement in performance and fairly quiet. Perhaps someone could post a video/sound clip to give you a better idea?
In fact that's given me an idea for Dusty's thread. Post a sound clip along with your picture.
Jon
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Post by tgwillis123 on Mar 5, 2017 19:07:41 GMT 1
I have the micron gp pipes, from a forum member. I actually did not know what gp pipes were when I bought them..I had no idea they went up one side, I just thought they looked nice in black chrome. Anyway popped them on one night..and within two miles blew the head gasket. I had been running gutted airbox and 300 mj with everything else standard. With the gp pipes I ended up at 380 mj. Bike pulls very well, with good increase in midrange. Start high and come down. My bike has these pipes fitted aswell, are they worth keeping? I intend on running a fairly standard engine set up, maybe go for pod filters but would be interesting to see what people reckon. The stacked pipes do look pretty damn cool though imo. |
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chrisk
Drag-strip hero
Posts: 281
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Post by chrisk on Mar 5, 2017 21:13:48 GMT 1
I have the micron gp pipes, from a forum member. I actually did not know what gp pipes were when I bought them..I had no idea they went up one side, I just thought they looked nice in black chrome. Anyway popped them on one night..and within two miles blew the head gasket. I had been running gutted airbox and 300 mj with everything else standard. With the gp pipes I ended up at 380 mj. Bike pulls very well, with good increase in midrange. Start high and come down. My bike has these pipes fitted aswell, are they worth keeping? I intend on running a fairly standard engine set up, maybe go for pod filters but would be interesting to see what people reckon. The stacked pipes do look pretty damn cool though imo. Hi, The ones I have, do not have the original silencers, mine are a bit shorter, I think they were from Norbo. Also I don't know if they had internal stingers from new, but mine has none. The sound when riding it is very nice, quite loud when opening up. Fittings are good, no oil leaks at headers, and finish is holding up well considering age, plus I have had them fitted for 10k miles last year. Midrange is very good, at the expense of not reving as high at top end, makes it easy to ride quite quickly. Downside...forget the centre stand, and it's a love or hate pipe looks wise, Tho the shorter cans help. I also have a metchamex fitted, which helps the overall looks with gp pipes imo. |
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Post by tgwillis123 on Mar 5, 2017 23:56:53 GMT 1
Thanks for the response. I must admit, the existing cans are prime for replacement in my head, but I do quite like the stacked look. Centre stand was never going to be going on it at any rate so that's a non-issue, and mid-range at expense of top end seems like a sensible compromise on a road bike. Mind you, at the ripe old age of 24 I shouldn't be doing the sensible thing, surely? haha
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Post by mattybeckett on Mar 6, 2017 16:02:11 GMT 1
I had short end can Microns on a 4L0 many years ago and it sounded and ran great  was jetted with k&n filters. Prefer the allspeeds now , less neighbor annoying  |
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was jetted with k&n filters. Prefer the allspeeds now , less neighbor annoying 