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Jimshorts
Original Poster
91 posts
16 months
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Contemplating giving the 7R some TLC. Put Motad pipes on it which have stopped it sounding like a tractor but seems to have introduced a flat spot at 5-6rpm. In these days of FI and Power Commanders can anyone recommend somewhere around Staffordshire or East/West Mids that can stick the bike on dyno and do rejet or whatever is required to perk it up a bit?
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norfolkscooby
966 posts
25 months
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Get to JT's performance centre. No one on this earth can make a 7R dance like Jon Trigger. Fact.
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CQ8
316 posts
97 months
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There you go VB, no excuse not to get your old snotter sorted.
Maybe you could organise a ph BB ZX7R dyno shoot out! There seem to be quite a few of you on here...
I would suggest a Ducati v ZX7R dyno showdown but it would be like taking candy from a baby...
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Fleegle
10,808 posts
46 months
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It would be like watching one geriatric after another s  t its pants
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Yazza54
9,801 posts
51 months
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VidalBaboon
8,914 posts
85 months
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norfolkscooby said: Get to JT's performance centre. No one on this earth can make a 7R dance like Jon Trigger. Fact. I phoned JTs a few weeks back, he said it had been a few years since he'd touched a 7R but would sort it out no problem. I do have to get it there as I think the seal has gone on the air box and no amount of tinkering is sorting it out. Ditch the Motad/sandy spares headers and buy a 2/H Akra or Muzzy system.
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rev-erend
17,924 posts
154 months
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I have a full Acra on mine and it sounds fantastic 
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podman
4,049 posts
110 months
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Jimshorts said: Contemplating giving the 7R some TLC. Put Motad pipes on it which have stopped it sounding like a tractor but seems to have introduced a flat spot at 5-6rpm. In these days of FI and Power Commanders can anyone recommend somewhere around Staffordshire or East/West Mids that can stick the bike on dyno and do rejet or whatever is required to perk it up a bit? See my post above in 'engine work midlands' , Daz from Melted sliders specialises in older school stuff and setting carbs up, based in Derbys.
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3doorPete
6,971 posts
104 months
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Most of the aftermarket headers introduce a flat spot between 5 and 6k rpm. It can be improved with jetting, but if you lean the area too much, you'll end up too lean at higher revs. Apparently the OEM headers, although rotting through quickly, were a very good shape. I think the expensive Akrapovic system is the best one for not causing the 5-6kpm flat spot. I've actually filled the majority of the flatspot shown on the graphs by fitting a 4 degree ignition advancer, which seemingly 'helps' the rich area of the rpm range by sparking earlier. Although not really affecting power, the 4 degree ignition advancer is one of the best mods I've made and it only cost me £28! Engine mods on mine. Full Micron system Blanked off Klean air system K&N filter float bowl mod HM Racing springs, needles and jets in carbs. Iridium plugs Made 119bhp at the wheel, but this was before the ignition advancer cleaned up the running in the rich range. Downside is, I have to run super unleaded now.  
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rev-erend
17,924 posts
154 months
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Just looked at the dyno chart for mine and it was 117.1 at the wheel  Still seemed slow after test riding a new blade and the BMW s1000rr though 
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