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Post by headcoats on Mar 26, 2022 12:52:38 GMT 1
Wow that picks up way better than mine ever did, I could live with that :-)
What carbs were fitted for the video ?
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Post by davecroucher57v on Mar 26, 2022 15:38:39 GMT 1
have your ports been lowered to match the piston at bdc.also check comprestion.mine was 170 better at 150.
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Rob123
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Mar 26, 2022 16:37:39 GMT 1
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Post by Rob123 on Mar 26, 2022 16:37:39 GMT 1
Wow that picks up way better than mine ever did, I could live with that :-)
What carbs were fitted for the video ? Pwk 35mm in the video bud it does go well. Not so much of a flat spot more of a stutter now. Did you try dailing your jetting in much on yours? Its a shame you couldn't get it running good before you sold it. I recon the majority of the flat spot can be sorted with the carbs setting up.
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Rob123
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Post by Rob123 on Mar 26, 2022 16:52:07 GMT 1
have your ports been lowered to match the piston at bdc.also check comprestion.mine was 170 better at 150. Hi dave I didn't lower the transfers at all these are running just how they came. I did note they were around 2-3 mm higher than the piston at bdc. I figured I'd run them as they came then make changes in the future when I get bored 😉. I completely agree with lowering compression to make it rev out better. I had 2 different heads for a cr500 one high comp from the earlier model and one lower and it ran better with the lower one on the road anyway. Cheers Rob
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Rob123
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Post by Rob123 on Jul 22, 2022 17:01:18 GMT 1
A little update on this project its been a while. ive done around 500ish miles on the bike now and just had it on the dyno at aj's in Hull today. I'd just popped in to have a chat so wasn't booked in for a session of setting it up. We just did 1 run to see how it was performing. Well it made: 74.38 bhp @8.82 rpm 44lbs of torque @8.70 rpm I'm well pleased with the result 😀 The exhausts would appear to be working very well and are not too peaky the power delivery is good mid range and don't need reving to the moon. I had my limiter set to 10500 on the ignitech for testing and have just reduced it to 9000 as there's no need to keep going. Jetting was good how ive had it setup running With the 160 mains was more or less perfect at top end slightly rich. 40 pilot airscrew 1 turn out Cel needles on bottom clip Also to note I'm running standard ypvs reed block with hy tech reeds. Now that I've got some numbers I can see what differences any mods will make not that I'm going to be doing any soon 👍 Cheers Rob
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Post by donkeychomp on Jul 22, 2022 22:01:55 GMT 1
Wowza Rob! BIG power. Congrats mate and enjoy the hell out of her.
Alex
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Post by LC_BOTT on Jul 23, 2022 8:18:08 GMT 1
Nice to hear it's going well, are these just standard untuned Athena barrels? As that's what mine are, didn't think from reading on here, they would make much power unless they had been ported, was a surprise to see over 50HP, from previous comments. Well done, giving me a kick up the butt to get mine started again
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Rob123
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Jul 23, 2022 9:48:02 GMT 1
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Post by Rob123 on Jul 23, 2022 9:48:02 GMT 1
Wowza Rob! BIG power. Congrats mate and enjoy the hell out of her. Alex Cheers Alex I certainly will be 😀
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Post by lcmarky on Jul 23, 2022 10:13:07 GMT 1
A little update on this project its been a while. ive done around 500ish miles on the bike now and just had it on the dyno at aj's in Hull today. I'd just popped in to have a chat so wasn't booked in for a session of setting it up. We just did 1 run to see how it was performing. Well it made: 74.38 bhp @8.82 rpm 44lbs of torque @8.70 rpm I'm well pleased with the result 😀 The exhausts would appear to be working very well and are not too peaky the power delivery is good mid range and don't need reving to the moon. I had my limiter set to 10500 on the ignitech for testing and have just reduced it to 9000 as there's no need to keep going. Jetting was good how ive had it setup running With the 160 mains was more or less perfect at top end slightly rich. 40 pilot airscrew 1 turn out Cel needles on bottom clip Also to note I'm running standard ypvs reed block with hy tech reeds. Now that I've got some numbers I can see what differences any mods will make not that I'm going to be doing any soon 👍 Cheers Rob Impressive work!
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Rob123
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Jul 23, 2022 10:17:59 GMT 1
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Post by Rob123 on Jul 23, 2022 10:17:59 GMT 1
Nice to hear it's going well, are these just standard untuned Athena barrels? As that's what mine are, didn't think from reading on here, they would make much power unless they had been ported, was a surprise to see over 50HP, from previous comments. Well done, giving me a kick up the butt to get mine started again Yes mate un ported barrels just as they come from norbo, everything he supplied me with has been spoton just bolt together and go more or less 😉. I think there will be more power to come from it with different exhausts, porting and ignition I'm happy as it is for now it runs well and has more than enough power. Glad to of give you some motivation its nice to read about something your building and to see a working end product 👍
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Post by Tobyjugs on Jul 23, 2022 12:08:37 GMT 1
Tony/Toby thanks bud 👍 yer I thought I'd share my findings maybe of use to someone. The carbs seem quite sensitive to changes I'm quite happy with how these are setup now its strong throughout the revs probably the best I'm going to get it without getting on a dyno. So are you saying you leaned it off for the road cause it drove better even though it had more power abit richer? Does your engine have a stutter at all? Cheers Rob Yes when setting it up as best i could by riding and plug chops i went with a smaller pilot jet. When i was happy with what i had done i put it on the dyno. The dyno showed it was better to use a larger pilot. I did have a very small hesitation spot only noticeable in top gear pulling from low rpm with wisde open throttle when tested on the road after the dyno test.
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Post by donkeychomp on Jul 23, 2022 21:51:32 GMT 1
Hang on a minute. MORE power? Alex
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42l Build
Aug 8, 2022 15:06:20 GMT 1
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Post by sidney81 on Aug 8, 2022 15:06:20 GMT 1
Looks great Rob 😎,did moving the filters back up set it or is that why you up jetted ??
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42l Build
Aug 8, 2022 15:35:43 GMT 1
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Post by headcoats on Aug 8, 2022 15:35:43 GMT 1
Ramair will make you some longer filters and maybe shorten the alloy tubes
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Rob123
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Aug 8, 2022 18:43:57 GMT 1
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Post by Rob123 on Aug 8, 2022 18:43:57 GMT 1
Looks great Rob 😎,did moving the filters back up set it or is that why you up jetted ?? Cheers Chris 👍 I'm not sure if it was adding the runners or a combination of both with adding the vforces also, but it didn't seem as good or smooth as per before the swap. I first went to 45's and it was oiling the plugs on tickover it was fine once on the move but just off idle there was abit of a rich stutter. I then went to 38's and the stutter was gone completely but so was the power it felt flat just off idle and up to a quarter throttle it wasn't smooth and felt erratic not nice to drive but the stutter had gone. Put the 42's in air screw at 1.5 and it feels the best it has so far it picks up instantly and is nicer to drive there is a slight stutter but only now and again. I feel with the 42's and vforces I'm right around were I need to be as I can feel adjustments on the airscrews straight away and have good scope either way depending on the weather/temps. Adding the runners gives a deeper intake sound for sure it sounds like a didgeridoo 😂 👍
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Rob123
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Aug 8, 2022 18:45:44 GMT 1
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Post by Rob123 on Aug 8, 2022 18:45:44 GMT 1
Ramair will make you some longer filters and maybe shorten the alloy tubes I'll look into some of them good call 👍
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42l Build
Aug 8, 2022 18:47:23 GMT 1
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Post by headcoats on Aug 8, 2022 18:47:23 GMT 1
They look like the length to you and me but they call it height !
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Post by LC_BOTT on Aug 8, 2022 19:35:21 GMT 1
All that power and still running a standard shock? Hats off to you for that, first thing I fitted on my build was a YSS shock. But still doesn't mean I could ride it any better I suppose Exhausts look good polished too.
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Rob123
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Post by Rob123 on Aug 8, 2022 19:43:45 GMT 1
They look like the length to you and me but they call it height ! Just had a look what size I can get in there and can get around 120mm in length/height comfortably had a browse on ebay and can get 117mm off the shelf 👍
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Rob123
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Aug 9, 2022 14:56:48 GMT 1
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Post by Rob123 on Aug 9, 2022 14:56:48 GMT 1
All that power and still running a standard shock? Hats off to you for that, first thing I fitted on my build was a YSS shock. But still doesn't mean I could ride it any better I suppose Exhausts look good polished too. On the to do list 😉.
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Post by JonW on Aug 12, 2022 0:11:25 GMT 1
Great result with the power and rideability. I really should pull mine out and get it going again, its currently unloved at the back of the garage Loving the idea of using tubes to get past the frame and the space behind the panels. you could mod the side panels for airscoops as well. I looked at doing that on the leading edge and some of the 'side' to duct air but it didnt seem tht use for me, it could be for you. FWIW On mine Im running foam filters direct to the carbs and they squash round the frame tubes ok. I did this as I am running an oil pump and battery box so have more limited space than you.
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Rob123
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Post by Rob123 on Aug 12, 2022 12:29:29 GMT 1
I've got the new filters fitted, shortened the tubes by 40mm it seems to run about the same no significant difference. I'm happy with having abit more surface area on the filter tho it can't do it any harm. With the pipes being mild steel and rust fairly quick I have coated them with some clear floor wax. I should of done it before I re fitted them to make it easier but it wasn't to bad. I used a foam washing up pad cut down to get it in easier and a little paint brush to get in the tight bits. I wasn't sure if it would withstand the heat but took it out for about an hour this morning after letting it dry overnight and it's perfect still, no peeling off or bubbling anywhere. I'd applied about 4 thin coats with drying it with the hairdryer inbetween coats I was hoping to get a more bronzing colour like when oil is applied but they've stayed fairly silver maybe just starting to go. Maybe it'll change with more time on them. Good idea on the vented side panels jon 👍 I may have a look into that. Jon regarding it running well I'm more than happy with it, it is just what I'd hoped it would be. I do think it is more sensitive to carb changes than I thought it would be, the driveability can be easily changed with small adjustments. I've read the airstrikers can be harder to tune over the standard pwk's although I'm not sure why.
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Post by donkeychomp on Aug 12, 2022 21:49:46 GMT 1
Floor wax is incredible stuff. I use it on model kits mainly on the clear parts to give them more lustre but I have found it can work as a lacquer too. Never seen it used on a bike before but I will certainly try it now!
Alex
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Rob123
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Aug 13, 2022 12:43:36 GMT 1
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Post by Rob123 on Aug 13, 2022 12:43:36 GMT 1
Floor wax is incredible stuff. I use it on model kits mainly on the clear parts to give them more lustre but I have found it can work as a lacquer too. Never seen it used on a bike before but I will certainly try it now! Alex Hi Alex I got the idea after reading about the Americans using mop & glow on there pipes. It seems mop & glow is only available in America but is produced by a UK company 🤔. This looked like a similar product so thought I'd give it a try. Good to hear your using it and are happy with it ill keep updating how it's doing 👍
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Rob123
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Post by Rob123 on Aug 13, 2022 13:18:39 GMT 1
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Post by donkeychomp on Aug 13, 2022 22:13:04 GMT 1
Bike looks so good! Love that mudguard.
Alex
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Rob123
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Post by Rob123 on Feb 24, 2023 13:24:38 GMT 1
A little update for everyone on this bike. So after running the athena kit for a while and thoroughly enjoying it I decided to build up a power valve engine to stick in. Cases,barrels and head were blasted by Tony at aj's. The 31k barrels were not rebored as they we're in good condition and in spec I just gave them a light hone they are on 0.5 over and are bog standard no porting etc. I purchased some new power valves off norbo and a new bush set from dave and set to work building the new motor. The crank is also standard and looks to have been recently re built its what came with an engine I'd bought. I fitted the lockout clutch off the 421 along with the vape flywheel and ignitech ignition. It's running daves map for the ignition timing and pv openings. I'm still running the vforce 4's and billet carb manifold but have gone back to stock 31k carbs and using pod filters. I used the 0.6mm base gasket that I'd used on the athenas along with a standard head gasket this gave a squish of 1.2mm I'd been riding and setting up the jetting to what felt the best at the end of last year but I've finally got it back on the dyno today 😃 I just popped in for one run again to see how it's running Carb specs are : 25 pilots 370 mains and I can't remember needle height possibly 2nd clip from bottom. I'm still using the exhausts I'd made and they're working really well on the pv motor. Although peak hp is down from the athenas the bike is alot smoother and civilised and is a real pleasure to ride. Max hp is at 8.88 rpm 59.41 hp Max torque at 8.64 rpm 35.54 Compared to the 421 which was : Max hp at 8.82 rpm 72.84 hp Max torque at 8.70 rpm 43.57 No dips in the curve like the athenas a very linear power delivery 👍 Cheers Rob
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Post by sidney81 on Feb 24, 2023 22:17:39 GMT 1
Looking good rob 🙂
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Post by JonW on Feb 25, 2023 0:37:34 GMT 1
Totally get why you might want something without the Jekyll/Hyde drive of the 421 as its not teh most relaxing engine lol. but also great that youve kept the 421 whole as well in case you want to swap the few parts back and ride it like that again.
I assume the bhp figures were at the crank not the rear wheel?
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