blackbetty Posted December 6, 2011 Report Share Posted December 6, 2011 Hello all! I'm new to this forum, I am more of a 4 stroke chopper guy and spend my time on those associated builder's forums. However, I recently acquired a 2000 Beta Rev 3 250 to fix up after a long 3 year indoor storage. The bike was not properly prepped for such a long storage, so I went ahead and did the usual steps in reviving a neglected machine. Truth be told, this is my first foray into a 2-stroke motorcycle (I'm a city kid). The Beta in question has very low miles, but was put in storage with fuel in the tank, so I did the standard maintenance as listed below following recommendations from previous Beta threads: Drained tank, replaced fuel line and filter Changed crankcase oil with Mobil1 10-40 synthetic Changed coolant with Dex Cool Premix 93 octane with Castor 927, 70:1 Rebuilt Mikuni roundslide; factory jetting and middle needle position Replaced air filter and intake manifold with new genuine Beta parts from Lampkins Reeds looked ok so I left them alone Replaced plug with new NGK BR7ES Replaced chain with a new 520 trials chain Flushed brakes and clutch After all of this I confirmed spark, then filled the tank w fresh premix and the bike fired up on choke after one kick. I pulled the silencer to replace the packing and left it off for the first run. http://www.youtube.com/watch?v=6BMHvqHtWAI I'm wondering if the Beta guys can tell me what they think about this idle? Motor is popping, but from other Beta videos this seems to be normal. It seems a little thirsty and seems to struggle a little when I give it gas, but this improves the more I start it and as the engine warms up. Does this idle sound right? Also, would anyone care to suggest a proper mix screw setting for this Mikuni? Any suggestions are greatly appreciated. Thank you for your time! Quote Link to comment Share on other sites More sharing options...
0007 Posted December 6, 2011 Report Share Posted December 6, 2011 That sounds good to me, they always have a loping downrev due to the heavy flywheel and clutch and they fire on the down rev as well which is different from a 4 stroke Set your air screw and idle on the trail after the engine is full temp There is no exact setting, use your ear, you just set it with your finger anyway Quote Link to comment Share on other sites More sharing options...
pindie Posted December 6, 2011 Report Share Posted December 6, 2011 Agreed. The running sounds fine to me. I get out and give the bike a run. Use the brakes hard, give everything a real twist turn and wiggle. Any snags will show up soon enough. I reckon you have a tidy bike! Quote Link to comment Share on other sites More sharing options...
cabby Posted December 6, 2011 Report Share Posted December 6, 2011 I've got a rev 3 also and runs great, and sounds pretty much the same as that Quote Link to comment Share on other sites More sharing options...
blackbetty Posted December 6, 2011 Author Report Share Posted December 6, 2011 You guys rock, thanks so much for the helpful advice! I'm stoked to go putt around on this thing, nothing like a new toy! Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 6, 2011 Report Share Posted December 6, 2011 You put in the wrong plug. Should be a BPR7es The p is for a projected tip. Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted December 6, 2011 Report Share Posted December 6, 2011 you need to ride it to clear it out then make adjustments it sounds loud and bangy at tick over which indicates rich fuel at low rpm so i would turn out the air screw untill it smooths out ,also once mudguard and cover is fitted it will run much richer again as this will restrict the airflow back to normal Quote Link to comment Share on other sites More sharing options...
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