Thread: Carb problem?
09-10-2009, 09:28 PM #1
- Join Date
- Aug 2009
Speedster 97 / Twin Rotax 720's. R Engine 'hanging' mid range (4000RPM), until last 1" of throttle when the power surges upto 6200RPM. If cruising at 5200RPM and revs drop slightly (eg in a turn) power then falls all the way back to 4000 RPM'ish and needs throttle pushing all the way forward to restore extra thrust. Engine starts / idles nicely. Also of note it will not achieve >4000RPM unless being 'helped along' by LH engine (ie offloaded). Have tried cleaning pilot jet with wooden toothpick; blowing passages with compressed air (aerosol). Is this enough; as nil change to the perf. Or could it be ignition problem; have already renewed plugs (BR8ES). Of note RH engine has never been quite as good as LH, with this problem developing slowly over time & worsening. Am not keen to swap components / disassemble LH engine as this unit running so well & typically achieving 6700RPM. Help pls!
Last edited by MetalGuru; 09-10-2009 at 09:34 PM. Reason: spelling
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
By cdoo951 in forum 2-Stroke PerformanceReplies: 2Last Post: 10-06-2007, 08:18 PM
By Mongoose in forum Yamaha Old School SkisReplies: 9Last Post: 06-27-2007, 11:54 AM
By nubmturk in forum Yamaha Old School SkisReplies: 7Last Post: 06-08-2007, 04:47 PM
By vomitspot in forum Yamaha Open DiscussionReplies: 1Last Post: 04-26-2007, 04:30 AM
By Gj#6 in forum Yamaha PWC Performance (2-stroke)Replies: 7Last Post: 02-16-2007, 10:33 PM