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  1. Here is all you need: Valve seat cutter: : https://www.aliexpress.com/item/32798463004.html?spm=a2g0o.detail.1000060.2.72f23352iKUIqY&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.169870.0&scm_id=1007.13339.169870.0&scm-url=1007.13339.169870.0&pvid=9de12d2d-2235-46f0-8b8b-f38059d34e49&_t=gps-id:pcDetailBottomMoreThisSeller,scm-url:1007.13339.169870.0,pvid:9de12d2d-2235-46f0-8b8b-f38059d34e49,tpp_buckets:668%232846%238108%231977&&pdp_ext_f=%7B%22sceneId%22:%223339%22,%22sku_id%22:%2263964038181%22%7D some pilots: https://www.aliexpress.com/item/1005001692692343.html?spm=a2g0o.productlist.0.0.c47c49ceSSDKzt&algo_pvid=b3a6186d-15ca-4e0a-8e3d-62eeb2e532fe&algo_exp_id=b3a6186d-15ca-4e0a-8e3d-62eeb2e532fe-50&pdp_ext_f=%7B%22sku_id%22%3A%2212000017740129519%22%7D cutterblades from Goodson: https://goodson.com/collections/valve-seat-cutter-blades A powerfull elektromagnet and some cutting and welding. Maker sure the rig is very stiff. If the rig is to soft, the cutter starts to vibrate and the valve seats will look like shit. This is not rocket science.
  2. That is correct. The jet needles can be changed by unlocking these top "screws".
  3. Can anyone help me identify these carburetors? They have a inner diameter of 38 mm and the distance between the carburetors fits perfectly to GSXR 1100 -89.
  4. Yes, just start cutting and welding. It is not rocket science.
  5. Here is my homemade valve cutter for cutting seat for larger valves.
  6. Why are you reducing the CR? In terms of its octane rating, ethanol has a rating of 113. Fuels with a higher octane rating reduce engine knocking and perform better. Also, almost all gasoline in the US contains 10 percent ethanol. When you mix 10 percent 113 octane ethanol with 85 octane gasoline it increases the octane two points to the normal 87 octane most consumers use. So the higher the ethanol content, the higher the octane. The octane rating for E15 (15% ethanol) is 88 octane and E85 (85% ethanol) is 108 octane. The use of ethanol blends in conventional gasoline vehicles is restricted to low mixtures, as ethanol is corrosive and can degrade some of the materials in the engine and fuel system. Also, the engine has to be adjusted for a higher compressive ratio as compared to a pure gasoline engine to take advantage of ethanol's higher oxygen content, thus allowing an improvement in fuel efficiency.
  7. Totaly agree, the main drawback with Mikuni RS is the heavy return springs. Go for Keihin FCR carbs.
  8. So you do not realize that you transfer more weight to the front by raising the bike at the back with a longer rear shock? :-)
  9. The length of the rear shock of the GSXR 1100 1990 is 312 mm. The length of hayabusa rear shock is 330 mm. The bike is going to be heavy at the front with the hayabusa rear shock.
  10. It is the cheapest and best option. Go for coil-in-cap also.
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