Freewind caburation

[norm]

Hi

I've recently bought a 650 Suzuki Freewind and have a problem at small throttle openings between 2000-3000 revs that makes driving in town a real pain.  The engine has a very jerky power delivery and wont pulll cleanly. Adding a bit of choke seems to help temporarily, suggesting weak mixture. Above 3500 rpm the engine pulls really well in all gears. I have stripped and cleaned the carbs, although they seemed very clean already. I have set the float heights, cleaned and oiled the air filter, without much improvement. Is this behaviour standard on the Freewind? has anybody had similar problems and found a solution? Any advice greatly appreciated.

thanks

[SteveC#222]

It sounds like it may be a partial blockage in the pilot/slow runing jet or maybe the airways, you could try blowing these through with and airline or footpump to try and clear it. Could also be an air leak  somewhere on the intake side. Another thought,  what gear are you using in town? modern big singles generally don't like running high gears at low revs and become very snatchy as you have described. You could try going down a gear to get the revs up a little.

[themoudie]

Aye norm,

Welcome to the site.

Agree with SteveC#222, trying to run at 30mph in 3rd or 4th gear may cause this snatchiness. 'Thumpers' they may be, but long stroke, British singles, they aren't!    Treat them as such and they will knock out the big end, gearbox, chain and sprockets!    Give it some 'wellie and it'll clear its throat! 

Don't forget the GB500NZ method of blowing your orifices through with liquid butane lighter fuel, works a treat!

All the best, Bill.

[SteveC#222]

Saw an interesting idea for checking jets and airways for blockage in one of the magazines the other day - a cheap Laser pointer! Apparently just point it down the jet/airway and if light comes out the other end it's clear!

[norm]

Thanks for the prompt responses. I have had the carbs completely stripped down twice, sprayed everything with carb cleaner and blown through with an airline, and as I said the carbs looked clean when I started. I have been getting the problem using third gear as dropping down into second for 30 mph seems a bit extreme. It is also rough on the overrun from 4th. I bought the freewind afer having had an SRX400 which fueled perfectly and was extremely flexible down to 30mph in 5th if you were gentle. The Freewind has a lot more punch and I really wanted to know if the rough low speed behaviour was the price I had to pay for it or wether it had a fault and could be smoothed out.

thanks again

[themoudie]

Aye norm,

Some of the other members have had DR650 and maybe 'Freewinds' and may pick up on this thread. Just give them a bit of time to crawl out from the weekend bivvies!

Regards, Bill.

[guest295]

I dunno about that motor but the GB500 is never happy below 3000. Big, modern singles in general want to tear themselves to bits at low RPM. For the GB, enriching the idle mixture (tiny screw under the carb) by 1/4 turn improves low-speed running enormously.