polini cylinder to vforce reed block to MLM intake compatibilit

John Lusignan /
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Hey all,

Haven't done much work on 2 strokes and I have a few questions about this cylinder/reed block/intake pipe issue I'm having.

Bought these parts on the recommendation from treats a while ago and I'm finally getting around to this. '78 Yamaha Chappy lb50. Installing Polini big bore 70cc kit.

1. vforce 8 petal reed block bolt holes don't exactly line up with the mounting holes on the Polini big bore cylinder. Seems like an easy fix, bore out the holes on the reed block to align with the cylinder holes. Thoughts, tricks, tips?

2. Once the reed block is mounted the reeds closest to the front of the bike only open a few mm's (actually maybe less once I get the holes aligned) because the port is blocking those two reeds from opening. For this I'm hearing that there are spacers/risers that might solve this issue. Thoughts, tips, tricks? Resources for the correct riser?

3. The hole from the MLM intake pipe i bought is round. the vforce reed block is rectangular. Is this an issue? Seems like a bit of an abrupt transition that might impede air flow but I'm not sure. Again, thoughts, tips, tricks?

Thank you guys in advance!!!

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