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  • Steve L Posts: 1248
    Gold Coast
    Performance Poster Steve L
    13 Jan 2018 09:37 AM
    Hi all
    I am soon going to be getting my 107 built and was wondering if the standard clutch is going to be able to cope. With the build I should be getting around 115 rwhp. I have been known to do the occasional burnout and power slides ( on closed roads ??) and don't want any issues. 
  • Krash Kinkade Posts: 2283
    Motor Head Krash Kinkade
    13 Jan 2018 10:26 AM
    steve , will probably depend on the bikes weight & your weight combined. also the amount of torque.
    just do the upgrade then ride it and see how it goes, a bit of clutch slip does not hurt.
  • Daggs Posts: 2393
    Lower South East, South Aust.
    Motor Head Daggs
    13 Jan 2018 01:35 PM
    You will more than likely need to fit a heavier spring at the very least and I would (did) fit a vpc as well
  • fatbat Posts: 2700
    Forum Legend fatbat
    13 Jan 2018 04:22 PM
    Posted by Daggs on 13 Jan 2018 01:35 PM
    You will more than likely need to fit a heavier spring at the very least and I would (did) fit a vpc as well

     x 2


    Heavier spring will work. I haven't used a vpc before but if got the $, it will lighten the clutch pull for when riding normally and in traffic 

  • Krash Kinkade Posts: 2283
    Motor Head Krash Kinkade
    13 Jan 2018 05:50 PM
    vpc is really good as can keep clutch pull light. I did not know how much you wanted to outlay.
  • Steve L Posts: 1248
    Gold Coast
    Performance Poster Steve L
    13 Jan 2018 05:55 PM
    Thanks for the replies, yeah it might just be a suck it and see. I don't want a heavy clutch as I do ride a bit in traffic. The bike is a 12/12 Street Glide and I'm around 90kg with all my riding gear on.
  • Daggs Posts: 2393
    Lower South East, South Aust.
    Motor Head Daggs
    13 Jan 2018 06:32 PM
    what sort of torque are you expecting to get steve? 

    my first build at 98hp & 115 ft/lbs of torque the clutch slipped so I fitted the spring. 

    I never really noticed it being any heavier to pull in but it stopped it slipping

    on my next build at around 121/121, I fitted the Aim VPC just to make sure. 

    I have to travel 500k to get a dyno done and 2 days off work so didn't want to get there and find it was slipping...

    the spring would probably be enough and only costs around $35, (the VPC was around $350)
  • Krash Kinkade Posts: 2283
    Motor Head Krash Kinkade
    13 Jan 2018 06:37 PM
    I'm only in the 80kg with riding gear.
    I learnt a lot drag racing and riding on the street and riding to race.
    I ran a stock Harley clutch with screaming eagle pressure plate so was heavier than stock but still stock clutch plates I used auto trans fluid type f in primary. I was runing low 11's with best 60ft time 1.65 this was a dyna twin cam best trap speed was 121mph in 4th averaged about 119 to 120mph depending on air quality on the day. best time was 11.2. clutch slipped when I shifted to 5th gear, so I just held 4th gear. latter I payed out som $ on an s&s clutch I've also owned a bandit super clutch ( probably best I've had but the s&s was good but I gained zero, no quicker no faster.
    about to do my old 03 sporty motor & gear box up but will leave stock clutch see how it goes ( sporty a bit lighter . bit of clutch slip takes stress off belt n gear box.
    if you find you have too much clutch slip just leave the stock pressure plate spring put a vpc pressure plate in they increase pressure as they rev and you have a light pull.
  • Steve L Posts: 1248
    Gold Coast
    Performance Poster Steve L
    13 Jan 2018 09:15 PM
    thanks again and it sounds like a VPC might be the go. I don't intend on drag racing but I also don't want to be losing power because of the clutch. I will have to find out which one to get.
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