rd84
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Post by rd84 on Mar 14, 2018 2:19:38 GMT 1
It would be nice to hear an expert interpretation of the above graphs... do the graphs give any hints at whether or not improvement is possible ?
Cheers Paul |
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Post by marrcel on Mar 14, 2018 7:23:32 GMT 1
And why are the a/f ratio so different between the runs?
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rd84
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Post by rd84 on Mar 14, 2018 10:42:05 GMT 1
And why are the a/f ratio so different between the runs? Not sure, I think the main jet size was increased on the second run - I remember Dan saying it was running lean ( Original jets were standard - I think 165/165 ) - I think the leaner jetting is giving the higher power of ~81bhp ? - I believe it was jetted up for engine safety ? - the dotted horizontal line might be the ideal air/fuel ratio - hopefully someone will come along with a interpretation. |
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Post by marrcel on Mar 14, 2018 19:33:01 GMT 1
On my 84rd500 non powerjet standard pipes.
Main 220 for the front cyl
225 for the rear cyl
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rd84
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Post by rd84 on Mar 15, 2018 11:32:07 GMT 1
On my 84rd500 non powerjet standard pipes. Main 220 for the front cyl 225 for the rear cyl Mine is currently Mikuni 180/190 with TSA pipes but everything else standard - I think the pilot jet needs richening up - it seems to need a lot of choke at lower RPM when my bike is cold - my standard 47X needs almost no choke in comparison. Your bikes jetting seems to be really rich compared to my 1GE ? - I wonder what is causing the difference ?
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Post by marrcel on Mar 15, 2018 15:06:34 GMT 1
I thought that 240 was standard. But after 27 years, memory fades.
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begbie
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Post by begbie on Mar 16, 2018 0:54:01 GMT 1
Wow you have lost a big chunk of mid range between 5 and 8 k for a small gain in out right power over a stock bike, still some set up to do though i guess.
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Post by donkeychomp on Mar 18, 2018 0:40:37 GMT 1
That is sex on a stick.
Alex
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rd84
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Post by rd84 on Mar 22, 2018 10:26:25 GMT 1
Wow you have lost a big chunk of mid range between 5 and 8 k for a small gain in out right power over a stock bike, still some set up to do though i guess. It does feel weak in the mid-range compared to my standard bike - do you have a standard dyno graph ? I’m hoping some jetting and Ignitech CDI / YPVS Controller work will improve it ? Cheers Paul |
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rd84
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Post by rd84 on Mar 22, 2018 10:27:37 GMT 1
That is sex on a stick. Alex Thanks Alex - I’m really pleased with it - makes me smile every time I look at it. Cheers Paul |
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Post by copper99 on Mar 22, 2018 14:27:20 GMT 1
My bike (1GE) was running lean on the stock jets(165s) so Dave at Projex is starting by going up to 195s(as fitted to the 47X) , seems strange Yamaha changed the jetting so much between the 84 and 85 bikes.
BTW my bike is all stock.
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begbie
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Post by begbie on Mar 22, 2018 19:38:52 GMT 1
Wow you have lost a big chunk of mid range between 5 and 8 k for a small gain in out right power over a stock bike, still some set up to do though i guess. It does feel weak in the mid-range compared to my standard bike - do you have a standard dyno graph ? I’m hoping some jetting and Ignitech CDI / YPVS Controller work will improve it ? Cheers Paul There you go, my own rebuilt stock engine. www.flickr.com/photos/146873359@N04/40249179264/in/dateposted-public/ |
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rd84
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Post by rd84 on Mar 22, 2018 22:04:01 GMT 1
My bike (1GE) was running lean on the stock jets(165s) so Dave at Projex is starting by going up to 195s(as fitted to the 47X) , seems strange Yamaha changed the jetting so much between the 84 and 85 bikes. BTW my bike is all stock. I read that old 195 Mikuni jets are the same size as 165 - just Mikuni introducing a new system - don’t know if that is really true though? Cheers Paul |
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rd84
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Post by rd84 on Mar 22, 2018 22:04:55 GMT 1
Thanks James - Cheers Paul |
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rd84
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Post by rd84 on Mar 23, 2018 1:36:31 GMT 1
Thanks James - Cheers Paul I've overlaid my dyno graph over Begbies to show the loss of midrange on my bike - I'll get this investigated on the dyno to see if it can be improved....
Cheers Paul
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Post by copper99 on Mar 23, 2018 8:10:54 GMT 1
My bike (1GE) was running lean on the stock jets(165s) so Dave at Projex is starting by going up to 195s(as fitted to the 47X) , seems strange Yamaha changed the jetting so much between the 84 and 85 bikes. BTW my bike is all stock. I read that old 195 Mikuni jets are the same size as 165 - just Mikuni introducing a new system - don’t know if that is really true though? Cheers Paul Well find out when it goes back on the dyno, hopefully this weekend. Dave(from Projex) said he can make good gains to the midrange of my bike with a zeel and a couple of air box mods but im aiming to get a set of pipes as well, might have to wait a bit that one.. |
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rd84
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Post by rd84 on May 9, 2018 23:17:54 GMT 1
I read that old 195 Mikuni jets are the same size as 165 - just Mikuni introducing a new system - don’t know if that is really true though? Cheers Paul Well find out when it goes back on the dyno, hopefully this weekend. Dave(from Projex) said he can make good gains to the midrange of my bike with a zeel and a couple of air box mods but im aiming to get a set of pipes as well, might have to wait a bit that one.. Good luck - let me know how you get on JT Engine Developments have got my bike at the moment- hopefully it won’t be too long before I get the results. Cheers Paul |
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begbie
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Post by begbie on May 10, 2018 9:15:38 GMT 1
JT Engine Developments have got my bike at the moment- hopefully it won’t be too long before I get the results. Cheers Paul Can you dyno it with a stock set of pipes ? |
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Post by copper99 on May 10, 2018 15:54:21 GMT 1
Well find out when it goes back on the dyno, hopefully this weekend. Dave(from Projex) said he can make good gains to the midrange of my bike with a zeel and a couple of air box mods but im aiming to get a set of pipes as well, might have to wait a bit that one.. Good luck - let me know how you get on JT Engine Developments have got my bike at the moment- hopefully it won’t be too long before I get the results. Cheers Paul I thought id updated this thread Paul but obviously not. Below is a before and after graph, the difference on the road is even more pronounced, Dave "found" another 10BHP and fixed the rather weak midrange and haphazard power delivery. Ended up with 80BHP at the tyre which so im led to believe is very good for a totally stock bike. I gave it a good thrashing for a 100 or so miles over the weekend and it was a joy to ride. The only thing putting me off getting a set of pipes now is cutting holes in the seat unit panel, the aftermarket items all seem to have larger outlets require this part of the bodywork cutting, which im a bit reluctant to do. Keep us posted with your progress! 
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Post by LC_BOTT on May 10, 2018 19:58:12 GMT 1
I fitted a set of Lomas pipes, and never had to cut any bodywork. Although not cheap, they are one of the easier parts to get, if it needed replacing.
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rd84
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Post by rd84 on May 11, 2018 7:44:36 GMT 1
That’s great news with your bike - thanks for the graph - it’ll be useful to see if I have a problem with mine.
My TSA pipes also fit without modification to the tail unit - so that’s a couple of choices for you. You will have to rejet the TSA’s by at least 2 or 3 jet sizes - fingers crossed the midrange power can be solved on my bike. I’ll report the results and jetting details when it’s finished.
Cheers
Paul
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rd84
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Post by rd84 on May 11, 2018 22:33:44 GMT 1
JT Engine Developments have got my bike at the moment- hopefully it won’t be too long before I get the results. Cheers Paul Can you dyno it with a stock set of pipes ? It would be interesting to do that - but a bit difficult for the lower pipes - I’ll check this later in the year if the mid-range can’t be improved |
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rd84
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Post by rd84 on Jun 13, 2018 17:08:52 GMT 1
Latest dyno run - TSA pipes and standard CDI and YPVS controllers.....  Still well down in the midrange - so perhaps it needs the Ignitech Controller to restore lost midrange power? It runs a lot nicer now but still feels weak compared to my standard 47x Cheers Paul |
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rd84
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Post by rd84 on Jun 14, 2018 13:14:40 GMT 1
I read that old 195 Mikuni jets are the same size as 165 - just Mikuni introducing a new system - don’t know if that is really true though? Cheers Paul Well find out when it goes back on the dyno, hopefully this weekend. Dave(from Projex) said he can make good gains to the midrange of my bike with a zeel and a couple of air box mods but im aiming to get a set of pipes as well, might have to wait a bit that one.. Hi,
Do you know if Projex are still trading ? - I tried to phone them but their number 01384-633759 comes up 'not recognised'
I want to get the Ignitech CDI/YPVS controller fitted to see if the midrange power curve can be restored.
Cheers Paul
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Post by copper99 on Jun 14, 2018 16:50:50 GMT 1
Hi Paul, replied to your PM...See if Dave(Mutts) can do it.
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Post by tsa on Jun 14, 2018 19:58:52 GMT 1
Projex aren't trading anymore but Dave still runs the dyno at the same location. I will PM you his number Paul.
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Post by muttsnuts on Jun 15, 2018 13:46:15 GMT 1
Hi Paul, replied to your PM...See if Dave(Mutts) can do it. yes I can if need be, fitted a few iggy's to RD500's now, had good results with the best hitting just a smidge under 90bhp with Lomas pipes on |
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rd84
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Post by rd84 on Jun 18, 2018 11:20:44 GMT 1
Hi,
I finally rode my bike with the Racetech emulators - the damping is much better controlled than the OEM forks - it really supports the front end under hard braking but isn’t harsh and deals with bumpy roads well - it’s eliminated the severe fork dive I had under braking but gives a nice smooth ride - I fitted heavier springs as well - previously heavier springs alone didn’t resolve the Fork dive issue and they gave a very harsh ride. I found that heavier damping oil and different air gaps with stronger springs was an improvement over OEM but never resolved the Fork dive under braking and gave a bad ride on bumpy roads - the Racetech emulators plus harder springs are a significant improvement. My advice would be to go for the softest recommended spring unless you’re just going
to use the bike on trackdays.
I purchased the emulators from PDQ who will advise on spring rate for your rider weight and also provide the correct damping oil.
Hope this feedback is of help and apologies for it taking so long.
Cheers
Paul
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rd84
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Post by rd84 on Jul 9, 2018 17:04:35 GMT 1
I did 3 sessions at the Mallory 1000 Classic Bikes - a brilliant weekend - I didn't do the bike justice but really enjoyed myself - first picture shows the bike intact before riding it and the second picture shows the bike still intact after the 3rd session  .....
The Racetech emulators and brakes were fantastic - along with the Pirelli Supercorsas they really complimented each other - I now need to forget how the original bike handles and learn to lean over further and brake harder !
Cheers Paul |
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rd84
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Post by rd84 on Jul 9, 2018 17:11:41 GMT 1
BTW - even though the air temperature was 30 Centigrade I was told the tyre wear pattern was COLD TEAR ?? - What's that all about ? Is there someone who could explain the problem please ?
Thanks.
Regards
Paul
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