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Post by tokwanoa on Jul 29, 2008 13:09:33 GMT
Hello to everyone. Just joined the club as i am now the owner of a low mileage 1999 model 600. I am curious to know what mods you can recommend to improve the bike, just commonsense items as i am not trying to turn it into CBR.
I have already dropped the rear sprocket by 2 teeth because i kept looking for 7th and 8th gear!
Is the Dynojet kit worth the money? It seems to make a difference to the MPG+a few BHP. What do you get for your money? At the moment the bike is absolutely standard, it is a 600s by the way.
Any suggestions will be appreciated. Thanks.
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Post by General Gman on Jul 29, 2008 13:20:02 GMT
TBH, unless you change the exhaust you'll see no noticeable improvement from a DJ kit.
Although Dynojet reckon you'll get better MPG, all the bikes I've ever had with DJ kits have done worse for fuel economy.
With a free flowing exhaust you should be able to gain a few BHP - the standard ones are massively restrictive, as is the Motad Nexxus system.
I suppose it very much depends on what you want from the bike as to what mods would be worthwhile - if you're not caning it about (and I assume you're not if you've raised the gearing), then a modest improvement in power won't make a deal of difference.The exhaust has been designed to maximise torque - a 4 into 2 will make better low down power than a 4 into 1.
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Post by General Gman on Jul 29, 2008 13:20:18 GMT
And welcome, BTW  |
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Post by tokwanoa on Jul 30, 2008 12:09:10 GMT
Thanks for the reply General. I have another couple of questions if you can help.
What would be the best exhaust system to replace once the original is knackered.
I have balanced the carbs but am still not happy with slow running,its a bit lumpy/rough. Should I try adjusting the pilot jets? The Haynes(believe it if you like manual) says not to touch them. It also says the tickover should be 1100-1200 RPM which I think is a bit too high.
What should be the smoothest slow running speed achievable? And lastly what MPG can I expect running in the 50/60 MPH range. Many thanks.
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Post by bobh on Jul 30, 2008 22:01:41 GMT
In terms of extras I'd fit (in no particular order):
- Engine bars
- Fenda-extenda
- Hugger
- Better headlight bulb
- Carrier or topbox (or full luggage)
If you're thinking of changing the exhaust, start now by applying WD40 on the studs and nuts for a few days, then ease them off and apply copper grease. That way they'll hopfully come off again without stripping/breaking studs when you do finally get to do the full job.
Most 600 fours seem to tickover at around 1200 rpm, so I'd leave it at that. If it's set too low the revs will hunt and it will cause the transmission to rattle and wear - probably doesn't do the engine much good either. Also the engine will hesitate or jerk rather than giving a smooth pick-up wjen you open the throttle.
If you're genuinely running at 50/60 mph you should get very good fuel consumption - possibly into the 70's. But in the real world, riding sensibly, 60 is a good target to aim for.
Enjoy - Bob
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Post by tokwanoa on Jul 31, 2008 9:14:03 GMT
Bob you are right about the tickover and the headlight bulb.I will sort these asap. I guess the lack of flywheel effect needs a higher tickover?
Just an update on the bike itselfe- Got it for £750 with less than 6,000 mls on the clock. It had a top box,engine bars and a Scottoiler fitted. I have fitted a fenda extenda to it. Recon its the best buy i have had in a while and ive had over 30 bikes in my time. It had done less than 200 mls in the last 3 yrs so its had a complete overhaul before going for the MOT.
I also have a 650 V-Strom, my sunday bike and longer trips with the Mrs.
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Post by General Gman on Jul 31, 2008 10:44:23 GMT
Hmm... i posted yesterday with a list of exhausts but it didn't appear...
OK :
Motad Nexxus - no gains on standard, look naff and questionable quality
Predator - choice of quiet or loud, seem to be good quality
Jama make a direct replacement 4-2 which is superb quality and fits perfectly - expensive, though
My choice would be the Remus full system - should get a power gain and they sound nice, but you need to ring around to find them
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Post by beeblemaster on Jul 31, 2008 11:01:31 GMT
I'm surprised your bike is suffering from being a little rough/lumpy at low revs. My experience of later bikes (post 96) of 2x 1997 models they were silky smooth at tickover/slow running, in fact throughout the whole rev range.
My 1995 model is a bit lumpy and unsteady at idle but that seems normal, but it is noticeably different than a later model. The 1996+ models got different carbs and TPS (Throttle Position Sensor) so I'm guessing these changes helped.
PS - Might be worth checking the TPS is ok. There are articles on the site to show you how. You'll be able to search for them.
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Post by Sharklet on Jul 31, 2008 14:31:26 GMT
Welcome to the site and enjoy your bike. The only modification I would consider to my 600 is the removal of the restrictor kit, sadly not for another 18 months though. Oh well.....
Stay safe
Jane
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Post by tokwanoa on Jul 31, 2008 14:34:25 GMT
Thanks for the info. Did the TPS from the article on here. Im not sure if all is OK with the result I got . Followed the simple instructions but the rev counter only went up to 3,000 RPM and back, it did not go to 10,000 and back as suggested? I watched it do this a couple of times before reconnecting the plug. It then indicated the correct 5,000 rpm as per the instructions.
(slight varyation from Mr haynes). Do you think there is a problem with this check i.e. the tps or something else. Apart from a slight lag in the pick up (too low tickover) the bike seems to be running OK.
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Post by CD on Jul 31, 2008 16:51:19 GMT
The TPS is probably not quite right. It should shoot to 5000. If it's not doing that adjust it a touch more. Correctly set the TPS improves low speed smoothness and fuel economy.
It will be interesting to see if the higher gearing improves fuel consumption. The engine is designed to rev at 9000 so there will be lots of valve overlap (though not R6 territory) making it less efficient at low revs. Can't have it all ways sadly. Its also fluffy to pick up at very low revs.
The 900 works well at very low revs but I get better low speed economy if I let the engine spin a bit more without actually covering ground quicker/faster.
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Post by bobh on Jul 31, 2008 20:40:18 GMT
Another reason for lumpy tickover if the bike's been standing for a while could be the pilot jets getting partially blocked by jellified petrol (if you know what I mean). Apparently normal 95-grade unleaded is very bad for this.
I had this problem on another bike after it had been standing for a month, and had to take out and clean all the pilot jets because they were completely blocked and the bike would only tickover with the help of the choke. But if the jets are only partially blocked some FST additive in the tank, and/or using one of the fancy 97-98 octane unleaded fuels, should eventually clean them out.
Bob
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