holdenman Posted February 11, 2021 Share Posted February 11, 2021 I finally found myself an affordable GN250 for a project, it's actually in pretty good nick and someone obviously gave up on it. So jumpered the battery which is holding voltage now and stabbed the started thinking how many clunks and clangs is it going to make but got a very pleasant surprise as it turned over freely but didn't fire. Ok I thought can only be spark or fuel so pulled the plug out which was brand new and it had nice blue spark so dumped some fuel down the hole and had another go after putting plug back in and vroom started almost immediately. Great found the issue so pulled the carb off and the main was completed blocked and the float was seized. The idle was ok so used some carb cleaner and small jet files and cleaned it out put it back together and it runs ok with a bit of throttle but rough idle and will stall. then while I had the seat off noticed some smoke coming from a connection. The nolex connector was basically welded together so after destroying it to find the wires a bit messy but an easy enough thing to fix. All in all maybe at worse a replacement carb but I will soak it in CLR for a while like I have done in the past and blow them out with air, and a replacement nolex connector. It has a few scapes and the tank has a couple of dings, one side cover was sellotaped on and i need a new rear indicater and it should be ready for taking through to get reregistered. 9 Quote Link to comment Share on other sites More sharing options...
holdenman Posted February 16, 2021 Author Share Posted February 16, 2021 Everything SORTED - Ready for vtnz, thanks for the help offer I soaked the carb for several hours then washed it out with water and have just got it back on and it starts easier and now idles sweet. I took it for a 100 yard test and rides and runs perfect Front brake is powerful enough and no unusual noises coming from the engine or drivetrain, all 4 indicators now work after tightening one, soldering the wire and replacing the bulb. Hi/Low beam working good. I have treated the bare metal with rust treatment where the littles dents in the tank had flaked some paint. 3 Quote Link to comment Share on other sites More sharing options...
holdenman Posted February 16, 2021 Author Share Posted February 16, 2021 3 Quote Link to comment Share on other sites More sharing options...
holdenman Posted February 16, 2021 Author Share Posted February 16, 2021 I did a rego check so i can get it checked I LOL'd when I saw previous owners and it explains the dents and lowish mileage and that it looks like it had garage stored 1 2 Quote Link to comment Share on other sites More sharing options...
tortron Posted February 16, 2021 Share Posted February 16, 2021 Barrington is quite fitting Usually the engines at least are well maintained on those bikes, but could probably do with a rering and max revs to break the glaze of putting around cones Quote Link to comment Share on other sites More sharing options...
holdenman Posted February 16, 2021 Author Share Posted February 16, 2021 Re-ring only if required, I was a motorcycle courier in Sydney in the 80's (no restriction where I went), and my clutch wore out at 55,000kms on my Honda 250RS single so parked outside the bike wrecker one morning removed the complete engine and swapped for a low k one and it took me a week to get it revving past the redline in top like the old one, factory max speed was 146km/h but my max was 166km/h. Here i am radio on back, speaker and mic on handlebars, map book of sydney on tank and my locking paniers It has returned home 5 1 Quote Link to comment Share on other sites More sharing options...
holdenman Posted April 14, 2021 Author Share Posted April 14, 2021 Had a near disaster as I am about to re rego it! I Booked a brake test for yesterday afternoon, went out and tried to start it, finally checked the fuel and empty. I put a few litres in it and thought, shitty carb must have leaked it out and I will need to fix that when I come back. It finally fired but was running a bit rough and not idling very well, I removed the carb checked it and seemed ok so blew it out with the air and put it back. I took it for a run and it wasn't happy at all and when I got back it was leaking oil around the area of the front sprocket. Took the cover off, cleaned it up but couldn't find anything wrong. I thought I better check the air filter in case it was that. Once I removed the filter I found it was in a bath of oil and petrol mix and realised where all the fuel had gone, checked the oil window and side of the engine and it was well full so drained the oil and about 3.5 litres came out of fuel and oil mix. I drained the filter box and put fresh oil and it ran fine to the shop. I was talking to them and they just said, typical GN indestructible but also said this can happen as the needle will need replacing. I am amazed as instead of hydraulic damage it just pumped enough into the air box via the breather to run. What is the use of the overflow in the bowl if it doesn't work! Quote Link to comment Share on other sites More sharing options...
tortron Posted April 14, 2021 Share Posted April 14, 2021 Probably want to change the petcock while you are at it, even with the overflow you still gotta turn them off what year is the bike? Quote Link to comment Share on other sites More sharing options...
holdenman Posted April 14, 2021 Author Share Posted April 14, 2021 1 hour ago, tortron said: Probably want to change the petcock while you are at it, even with the overflow you still gotta turn them off what year is the bike? I actually pulled it apart and checked it when i got the bike, i never turned it off and sat for 5 or 6 weeks. I have never had to turn off fuel before on my old bikes but then I was riding them all the time. It's a 2004 model first rego'd in 2005 Quote Link to comment Share on other sites More sharing options...
holdenman Posted June 19, 2021 Author Share Posted June 19, 2021 All legal now so all I want now is for this damn rain to stop enough for some dry roads! 2 2 Quote Link to comment Share on other sites More sharing options...
holdenman Posted June 25, 2021 Author Share Posted June 25, 2021 So I took it out for about an hour or so to try and loosen up the engine as it was struggling to pull past 100 and barely got to 105 last time where it also created a fuel/carb issue and I thought I was going to have to call out for help but after running it on choke for a couple of ks it came ok, guess it was a small blockage. This time I had no issues and gave it a few blasts down the highway and around town. I then brought it home and made a small modification then took it down the highway and it pulled nicely to just over 100km/h in 4th then 5th tapped out at 120km/h, it may have been a fluke but from what I can gather the norm seems about 110 but I doubt I will try again as I would feel like a mug getting a speeding ticket on a GN250 as most people wouldn't believe me anyway. Quote Link to comment Share on other sites More sharing options...
tortron Posted June 25, 2021 Share Posted June 25, 2021 sounds about right, my old one would do an indicated 115-120 on the auck-ham trip, even passed one or two cars 1 Quote Link to comment Share on other sites More sharing options...
holdenman Posted June 25, 2021 Author Share Posted June 25, 2021 14 hours ago, tortron said: sounds about right, my old one would do an indicated 115-120 on the auck-ham trip, even passed one or two cars Thanks for that, I have only done probably 30kms on it so far but I am treating it a bit like my old Honda back in the 80's to try and loosen it a bit, probably take a few 1000ks tho. Maybe a few trips to Westport fishing will do it but that can wait until after winter. I am lucky as their is a room and bed to stay whenever I like. Question though, as I feel my carb isn't quite right yet, how long did you need the choke from cold, also when warm did yours run past the redline much in 4th? Quote Link to comment Share on other sites More sharing options...
tortron Posted June 25, 2021 Share Posted June 25, 2021 They do take a bit to warm up, same as the 125 and DR, i think its just a single suzuki thing, certainly they wont warm up on idle before riding off. Mine being an 82 never had a tach, so i just gave it as many revs as it would produce before not gaining any more speed. But i dont think it ever got to valve bouncing territory in 4th or 5th. if its doing that the clutch may be slipping. I rememeber taking the clutch steels out and lapping them with some sandpaper on glass and then adding a washer under the clutch pack springs on one of my engines that had been sitting a while, to get good grab out of it. Quote Link to comment Share on other sites More sharing options...
Beaver Posted June 25, 2021 Share Posted June 25, 2021 On 20/06/2021 at 09:05, holdenman said: All legal now so all I want now is for this damn rain to stop enough for some dry roads! What's going on here? 2 Quote Link to comment Share on other sites More sharing options...
holdenman Posted July 2, 2021 Author Share Posted July 2, 2021 On 26/06/2021 at 08:58, Beaver said: What's going on here? In the best Shultz voice... "I see Nothingg!" Big hp GN250.... LOL YEA NA. Quote Link to comment Share on other sites More sharing options...
tortron Posted July 2, 2021 Share Posted July 2, 2021 2 minutes ago, holdenman said: In the best Shultz voice... "I see Nothingg!" Big hp GN250.... LOL YEA NA. Quote Link to comment Share on other sites More sharing options...
holdenman Posted July 2, 2021 Author Share Posted July 2, 2021 haha. thats golden Quote Link to comment Share on other sites More sharing options...
tortron Posted July 2, 2021 Share Posted July 2, 2021 Theres a turbo in there incase you missed it Quote Link to comment Share on other sites More sharing options...
holdenman Posted July 2, 2021 Author Share Posted July 2, 2021 38 minutes ago, tortron said: Theres a turbo in there incase you missed it Maybe it was turbo smoking as GN's cant really smoke a tire Quote Link to comment Share on other sites More sharing options...
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