dieseldan

i have a 98 xc 600 on low rpm it bogs down and will backfire but wide open it runs great it has 7000 miles engine was rebuilt once it has 110 psi it seams like the warmer the engine gets the better it runs but it never stops bogging and backfire out of the exhaust the engine runs great once you get past 5500/6000 rpm anything before that rpm it runs like crap. any ideas anyone? could it be the cdi/coil pack? or something with the clutches?

slednecks18

Sounds like it could possibly be getting to much gas to ware at a lower rpm it floods it and can't burn the amount of fuel its receiving and at a higher rpm the sled has enough spark to burn off the fuel

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scrammy650

how are the reeds

gary1989650

i have a 89 indy 650 i just did a motor swap trying to get running for a few more rides its really weird because it runs great untill i put the cap on my coolant botttle then it bogs down and its gonna be the death of me can anyone help

gary1989650

and i just changed the head gasket figured it may be the problem

xflyer53

Backfire is usually an indication of a lean condition. Under 5500 RPM I would guess pilots are dirty.

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'92 Indy 650
'95 Indy XLT 600, plastic skis, skid plate, cobra windshield, XTRA 10, full Fox package, 1" riser

xflyer53

gary, you might want to start a new thread. Your problem will most likely get lost in this thread.


There should be no correlation between the 2. If the head gasket were the problem it would not run very well if at all. If you pull the crank drain plugs and see coolant then you know you have a problem there. I would start with making sure the carbs are completely clean and properly adjusted.

__________________

'92 Indy 650
'95 Indy XLT 600, plastic skis, skid plate, cobra windshield, XTRA 10, full Fox package, 1" riser