![]() ![]() These carbs have a definite limit on fuel delivery and it seems that the more open the exhaust is the harder it gets to tune these carbs. Check that fuel flow from petcock is good, No backup of sediment at float valve screen (stock). Our Vague best guess is - 1980-84 models with stock 34mm CV carbs (North America) usually seem to require (about) a Main jet 142.5 - 147.5, Pilot Jet of #45, Air Jet of # 127.5, Idle mixture screws set at 2.5- 3 turns out, carbs in sync, fuel level shut-off in float bowl set high. Spark plugs should show a light tan color on the insulator. Every bike varies and a lot of factors effect this so a plug read & testing is the only real way to answer this (Altitude, ignition, engine compression & other factors effect tune). I am changing to aftermarket exhaust and/or air filters what jets do I need ?Ī. CV carbs fitted in North America are a particular problem as they were jetted Very lean, these lack some of the tuneable components found on the stock 1970-79 VM38 CVcarbs.Ģ. 1980-84 models with emmissions type 34mm. Absolutely! All aftermarket filters or exhaust flow more air & your system will require more fuel to go with that air. If I change my exhaust or Air filters to a type different than original will I need to rejet my carburettors ?Ī. XS650 Tech Info - 20 Frequently Asked Questions :ġ. Please check back regularly.Ĭlick Here for Step by Step Engine Overhaul Instructions This section is currently under consruction. ![]()
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