Bigger jet needed in modified Spree??

[Animal Chin]

Hello,

I recently bought a "44mm big bore" kit for my Spree and it came with a new jet. When I installed it, the engine would not accelerate. I put in my old jet and the Spree runs fine. A friend of mine said that even though it runs fine I could be damaging the engine. I was wondering if anyone had a similar issue. My new jet says 95 while the old one said 55. Thanks for any input.

[bradthreee]

Ebay seller *chop*chop*123 aka tazland001 sells those kits and its well documented that the main jets he sends with his kits are in fact too big!

The only way to really figure out which jet size would be appropriate with your set-up would be to buy various sizes that you can try and read the plug.

You should have a nice cardboard color when proper air fuel mixture is achieved.

Your friend is right about what he said. I personally would not leave the stock 65 jet in there after the big bore install as you will probably be running lean. Maybe start with a 75 and work around that. If the plug is too light then upjet (increase jet size). If the plug is too dark then downjet (decrease jet size)

[Wheelman-111]

Greetings:

Since Honda has a ready-made 78, I suggest you start with that. No direct information except from another Forum Denizen who's got the same BBK as yours. The part number is available from Honda:

99101-187-0780

It may be a bit rich, if anything, which isn't a bad way to break in. If it won't accept throttle or burbles at the low end, you may get it to work by moving the needle clip to the top position. Do as B3 suggests, don't abuse the throttle and pull the plug frequently to check. If it's white, order up an 85 or an 82 and try one of those.

[Kenny_McCormic]

Its better to run rich than run lean, sparkplugs are FAR cheaper than a new bore kit.