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Post by fletche36 on Jun 18, 2024 22:01:31 GMT 1
Ok, results are in after a trip up to see Dave today ( Also had the pleasure of meeting Jon, all the way from Oz too) to make sure i was close with how i had jetted the PWKs. Now i knew i had got it close just by what i know myself( and im no pro tuner or jetting expert, just someone who has learned through experience over the years)but for peace of mind it had to be a dyno check and its got to be Dave for me as its an hours drive so not too far and he really knows his LCs. Anyway, i explain that i want a health check and to improve any areas where it can be made better so on the dyno it goes , ear defenders are on and fingers are crossed!The bike gets given the beans in a sympathetic way and the results come in.... not too much wrong with what i have done and no brass changing is needed just a turn of the airscrews. Another run is done and a slight improvement is found and im happy to share the results. ( for the fecking life of me i cant put the dyno pics on here and trust me i have tried)Max power is up from 33 bhp ( a healthy 250) to 39 bhp and torque is up from 21ft/lbs to 24 ft/lbs !!! Thats a std unported engine running swarbrick pipes, chinky carbs and pod filters. I do have a squished and o ringed head to fit at some point in the future which will put it over 40 bhp but for now ill happily run it as is through summer. Thats probably all ill post on this thread now unless i manage to upload the dyno graphs so thanks for your interest guys. Nice Post. I also do all my own jetting and just like you I like to check the results on a dyno. Just out of interest did the airscrews go in or out? Airscrews in to one turn out from full in. Dave did say that although my main jet is in range , its only just still in the safe zone so for safetys sake ill probably go up one size . some good knowledge came my way today  |
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dex46
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Post by dex46 on Jun 19, 2024 7:33:24 GMT 1
Great thread mate thanks for sharing all the information and a nice gain in power for little money 🤔 time to go shopping 🤣 would you mind sharing a link to the carbs you got
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Post by fletche36 on Jun 19, 2024 15:10:59 GMT 1
Great thread mate thanks for sharing all the information and a nice gain in power for little money 🤔 time to go shopping 🤣 would you mind sharing a link to the carbs you got There you go sir. Oh, forgot to put that i had changed the 42 pilots to 45s before going to mutts so bear that in mind when ordering jets. Also this is on a 250 so you may need a size larger on everything if going on a 350 or bigger. |
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Post by fletche36 on Jun 19, 2024 15:33:34 GMT 1
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dex46
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Post by dex46 on Jun 19, 2024 17:44:45 GMT 1
Great thread mate thanks for sharing all the information and a nice gain in power for little money 🤔 time to go shopping 🤣 would you mind sharing a link to the carbs you got There you go sir. Oh, forgot to put that i had changed the 42 pilots to 45s before going to mutts so bear that in mind when ordering jets. Also this is on a 250 so you may need a size larger on everything if going on a 350 or bigger. Thanks mate appreciated 👍👍 |
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Post by JonW on Jun 21, 2024 8:40:11 GMT 1
Great to meet you too!
Bike looked and ran beautifully.
Btw. You missed the torrential rain leaving when you did.
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dex46
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Post by dex46 on Jul 14, 2024 16:26:36 GMT 1
 IMG_3364 by Andy Dexter, on Flickr Following on from fletche 36 great thread thought I would give the Chinky PWK’s a go on my 250 and i must say I’m very impressed with the outcome running slightly rich in the low to mid as I’m still waiting for the Jitsie JJH needles to arrive my Chinky Carbs came with apparently JJH needles well they are stamped JJH so currently running them until the jitsie ones arrive I’m running allspeeds as well compared to fletche 36 who has Swarbricks so jitsie needles 140 main and 42 pilot I should be in the sweet spot Thanks again Fletche 36 for a great informative thread 👍👍 |
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dex46
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Post by dex46 on Jul 14, 2024 16:28:19 GMT 1
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Post by dex46 on Jul 14, 2024 16:29:41 GMT 1
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Post by jessy03 on Jul 14, 2024 22:05:28 GMT 1
I compared some genuine JJH needles to the Chinese ones and the genuine ones were slightly longer 🤔
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dex46
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Post by dex46 on Jul 15, 2024 7:01:12 GMT 1
I compared some genuine JJH needles to the Chinese ones and the genuine ones were slightly longer 🤔 Yeah I’m not trusting the Chinese needles like I said I need to smooth out the low end it’s not a million miles away but I had to lower the needle two clips to 2nd clip from the top which seems a bit extreme so I’m hopeful that the new needles will do the job I’ve also got some 42 pilots on order to try instead of the 45s |
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Post by Tobyjugs on Jul 15, 2024 16:12:52 GMT 1
Just for interest I noticed changes to the pilot jets can make a big difference to the whole performance when using a dyno-bank for measuring performance.
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dex46
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Post by dex46 on Jul 15, 2024 17:31:57 GMT 1
Just for interest I noticed changes to the pilot jets can make a big difference to the whole performance when using a dyno-bank for measuring performance. Yeah I’m going to do one step at a time at moment running the same jetting as fletch so hopefully just by using quality needles it should be there abouts maybe might be able to come down to 140 main as I’m thinking allspeeds won’t need the same main as swarbricks To be fair it’s not far out but there’s room for improvement and it’s good to tinker 🤣 |
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Post by keith101 on Jul 17, 2024 15:32:50 GMT 1
I put some on 350lc, mild tune. Changed main jets, needles and I think slow running jets. Went great from the off. So I would recommend them especially at the price. But obviously check the jetting etc.
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Post by fletche36 on Jul 17, 2024 19:52:31 GMT 1
Just for interest I noticed changes to the pilot jets can make a big difference to the whole performance when using a dyno-bank for measuring performance. Yeah I’m going to do one step at a time at moment running the same jetting as fletch so hopefully just by using quality needles it should be there abouts maybe might be able to come down to 140 main as I’m thinking allspeeds won’t need the same main as swarbricks To be fair it’s not far out but there’s room for improvement and it’s good to tinker 🤣 The swarbricks actually run with a one size smaller main ( well they did on the old carbs). Bet you end up pretty good just by using different needles. Good luck with your "fiddling". Next up im going to recommend the o ring and squish corrected head done by mutts. That cleans everything up a little with a bit more power too. |
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Post by fletche36 on Jul 17, 2024 20:03:09 GMT 1
Dex. After studying your pics it appears yours are slightly different carbs to mine in respect that the tick over screws are on different sides to mine and also mine has a power jet tube at the back. i was unsure about the power jet thing as i had never messed with those but it turned out fine. Also you may want to change your oil inlet spigots to angled ones just in case you end up with the first cm losing oil into the carb due to gravity. that may not be the case but something to keep your eye on.
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dex46
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Post by dex46 on Jul 17, 2024 20:04:47 GMT 1
Yeah I’m going to do one step at a time at moment running the same jetting as fletch so hopefully just by using quality needles it should be there abouts maybe might be able to come down to 140 main as I’m thinking allspeeds won’t need the same main as swarbricks To be fair it’s not far out but there’s room for improvement and it’s good to tinker 🤣 The swarbricks actually run with a one size smaller main ( well they did on the old carbs). Bet you end up pretty good just by using different needles. Good luck with your "fiddling". Next up im going to recommend the o ring and squish corrected head done by mutts. That cleans everything up a little with a bit more power too. Thanks mate Going to do the needles first before I do anything to the main and pilot jets Over winter it will have a mutt’s nutt’s 370 conversion just tinkering and enjoying riding it as is at the moment until its completely stripped for a empty the piggy bank hybrid build Cheers again for the very informative thread 👍 I will post my final settings |
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Post by dex46 on Jul 17, 2024 20:10:48 GMT 1
Yeah I noticed the difference as well mine are not power jet carbs but am impressed with the difference they made over the standard carbs quite noticeable over 6k will keep eye on oil lines think they will be fine as I know some have used the vacuum spigot’s
If it goes pop the hybrid build will start a little earlier 🤣
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Post by reedx on Jul 19, 2024 18:06:24 GMT 1
Now i know the jets should be genuine but in the past i have used Jitsie ones which will be accurate ( a belgian company well known in the trials world) and Jitsie also supplied the carb tops (£10.50) and needles(£7), so altogether im about £75 in and should this all be a useless exercise and i have to buy some genuine ones i will have all the necessary parts i need. I wasn't aware of the Jitsie brand, but they look useful for some parts I need to modify my genuine PWK28's. Which supplier did you use for the spares Peter? Colin |
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Post by dex46 on Jul 19, 2024 18:38:15 GMT 1
Hi Colin
Fletch I think ordered directly from Jitsie they have a website wish I had now as got messed about a bit on my order from a trial specialist in the UK
DEX
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Post by jessy03 on Jul 19, 2024 18:45:57 GMT 1
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dex46
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Post by dex46 on Jul 19, 2024 20:55:16 GMT 1
There who I got parts from in the end very fast delivery as well 👍 |
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Post by reedx on Jul 19, 2024 21:10:29 GMT 1
Hi Colin Fletch I think ordered directly from Jitsie they have a website wish I had now as got messed about a bit on my order from a trial specialist in the UK DEX Cheers Andy, I'll check them out. Colin |
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Post by reedx on Jul 19, 2024 21:11:28 GMT 1
Very useful link. Thanks. Colin |
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dex46
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Post by dex46 on Jul 19, 2024 21:58:18 GMT 1
Hi Colin Fletch I think ordered directly from Jitsie they have a website wish I had now as got messed about a bit on my order from a trial specialist in the UK DEX Cheers Andy, I'll check them out. Colin Welcome mate |
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Post by abar121 on Jul 20, 2024 8:45:44 GMT 1
splatshop are great, have fun.
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Post by fletche36 on Jul 20, 2024 20:12:55 GMT 1
Now i know the jets should be genuine but in the past i have used Jitsie ones which will be accurate ( a belgian company well known in the trials world) and Jitsie also supplied the carb tops (£10.50) and needles(£7), so altogether im about £75 in and should this all be a useless exercise and i have to buy some genuine ones i will have all the necessary parts i need. I wasn't aware of the Jitsie brand, but they look useful for some parts I need to modify my genuine PWK28's. Which supplier did you use for the spares Peter? Colin I actually used Camio moto trials shop but i have used splat shop too in the past. Both much of a muchness. |
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